Thorlabs part-number comparison
Know the Thorlabs part number? Find the Precisometer mirror mount, cage component or optical post we have compared with it.
Each pair below serves the same application and was compared on published dimensions, interfaces and mechanism. Differences are listed with every pair. These are comparisons of published designs, not drop-in replacements: check the listed differences against your setup, or ask us to check them for you.
62 Thorlabs part numbers83 compared Precisometer modelsChecked 10 October 2026
Kinematic mirror mounts
Thorlabs
GM100/M
For gimbal mirror alignment with top-mounted adjusters
Compared Precisometer model
- NMVG25.4
Published specifications and differences
Feature NMVG25.4 Thorlabs GM100/M Optic diameter Ø25/Ø25.4 mm Ø25.4 mm (1 inch) Mount geometry Gimbal mirror mount Gimbal mirror mount Adjuster arrangement Two top adjusters for angular alignment Two top adjusters for angular alignment Optic thickness 3–10 mm Up to 16 mm Angular adjustment range ±3° ±2.5° Body material and finish Black Anodized Aluminium Alloy Black anodized aluminium Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–10 mm. Angular ranges and optic retention differ. The reference uses an SM1-threaded optic cell and retaining ring. Check the optical surface position against each drawing.
Thorlabs
GM200/M
For gimbal mirror alignment with top-mounted adjusters
Compared Precisometer model
- NMVG50.8
Published specifications and differences
Feature NMVG50.8 Thorlabs GM200/M Optic diameter Ø50/Ø50.8 mm Ø50.8 mm (2 inches) Mount geometry Gimbal mirror mount Gimbal mirror mount Adjuster arrangement Two top adjusters for angular alignment Two top adjusters for angular alignment Optic thickness 3–10 mm Up to 16 mm Angular adjustment range ±3° ±2.0° Body material and finish Black Anodized Aluminium Alloy Black anodized aluminium Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 3–10 mm. Angular ranges and optic retention differ. The reference uses an SM2-threaded optic cell and retaining ring. Check the optical surface position against each drawing.
Thorlabs
K5X1
For five-axis optic alignment
Compared Precisometer model
- NMUM25.4
Published specifications and differences
Feature NMUM25.4 Thorlabs K5X1 Optic diameter Ø25.4 mm Ø25.4 mm (1 inch) Mount geometry Five-axis kinematic mount Five-axis kinematic mount Adjuster arrangement Tip, tilt, X, Y and Z controls Tip, tilt, X, Y and Z controls Optic thickness <20 mm Up to 9.5 mm Angular adjustment range ±5° ±4° Z / front plate translation 6 mm ±3.2 mm X and Y adjustment travel ±2.5 mm ±1.0 mm per axis Mounting interface M4, M6 Two #8 (M4) counterbores at 90° Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 0–9.5 mm. Both provide pitch, yaw, X, Y and Z adjustment. Optic retention and travel ranges differ. The reference uses an SM1-threaded cell and retaining ring and accepts optics up to 9.5 mm thick.
Thorlabs
K5X2
For five-axis optic alignment
Compared Precisometer model
- NMUM50.8
Published specifications and differences
Feature NMUM50.8 Thorlabs K5X2 Optic diameter Ø50.8 mm Ø50.8 mm (2 inches) Mount geometry Five-axis kinematic mount Five-axis kinematic mount Adjuster arrangement Tip, tilt, X, Y and Z controls Tip, tilt, X, Y and Z controls Optic thickness <20 mm Up to 10.7 mm Angular adjustment range ±5° ±3° Z / front plate translation 6 mm ±3.8 mm X and Y adjustment travel ±2.5 mm ±2.0 mm per axis Mounting interface M6 Six #8 (M4) counterbores Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 0–10.7 mm. Both provide pitch, yaw, X, Y and Z adjustment. Optic retention and travel ranges differ. The reference uses an SM2-threaded cell and retaining ring and accepts optics up to 10.7 mm thick.
Thorlabs
KCB1/M
For right-angle beam steering with a round mirror and kinematic tip/tilt adjustment
Compared Precisometer model
- NRAM25.4
Published specifications and differences
Feature NRAM25.4 Thorlabs KCB1/M Optic diameter Ø25/Ø25.4 mm Ø25.4 mm (1 inch), round optic Mount geometry Right-angle mount for a round mirror Right-angle mount for a round mirror Adjuster arrangement Three adjusters on the angled plate Three adjusters on the angled plate Optic thickness 3–6 mm At least 3 mm; rear loading does not limit maximum thickness Angular adjustment range ±3° ±4° Mounting interface M4, M6 One M4 tapped hole and one M6 tapped hole (post mounting) Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–6 mm. The shared published optic diameter is 25.4 mm; support for 25 mm optics is not established for KCB1/M. NRAM25.4 specifies ±3° adjustment and KCB1/M specifies ±4°. The reference has 30 mm cage spacing, 4-40 cage rod taps and SM1-threaded ports. Matching cage spacing and port threads have not been verified for NRAM25.4; direct cage or lens-tube compatibility is not established.
Thorlabs
KCB2/M
For right-angle beam steering with a round mirror and kinematic tip/tilt adjustment
Compared Precisometer model
- NRAM50.8
Published specifications and differences
Feature NRAM50.8 Thorlabs KCB2/M Optic diameter Ø50.8 mm Ø50.8 mm (2 inches), round optic Mount geometry Right-angle mount for a round mirror Right-angle mount for a round mirror Adjuster arrangement Three adjusters on the angled plate Three adjusters on the angled plate Optic thickness 4–10 mm At least 6 mm; rear loading does not limit maximum thickness Angular adjustment range ±3° ±4° Mounting interface M4, M6 One M4 tapped hole and one M6 tapped hole (post mounting) Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 6–10 mm. NRAM50.8 lists 4–10 mm optic thickness; KCB2/M requires at least 6 mm, so the shared thickness range is 6–10 mm. NRAM50.8 specifies ±3° adjustment and KCB2/M specifies ±4°. The NRAM50.8 drawing shows M50 × 1 ports and M4 holes at 60 mm spacing; these differ from the reference’s SM2 ports and 4-40 cage rod taps. Direct cage or lens-tube compatibility is not established.
Thorlabs
KCB05/M
For right-angle beam steering with a round mirror and kinematic tip/tilt adjustment
Compared Precisometer model
- NRAM12.7
Published specifications and differences
Feature NRAM12.7 Thorlabs KCB05/M Optic diameter Ø12.5/Ø12.7 mm Ø12.7 mm (½ inch), round optic Mount geometry Right-angle mount for a round mirror Right-angle mount for a round mirror Adjuster arrangement Three adjusters on the angled plate Three adjusters on the angled plate Optic thickness 4–7 mm At least 3 mm; rear loading does not limit maximum thickness Angular adjustment range ±3° ±4° Mounting interface M3, M4 One M3 tapped hole and one M4 tapped hole (post mounting) Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 4–7 mm. The shared published optic diameter is 12.7 mm; support for 12.5 mm optics is not established for KCB05/M. NRAM12.7 specifies ±3° adjustment and KCB05/M specifies ±4°. The NRAM12.7 drawing shows M14 × 0.75 ports and M3 holes at 16 mm spacing; these differ from the reference’s SM05 ports and 4-40 cage rod taps. Direct cage or lens-tube compatibility is not established. The comparison uses the catalogue thickness range of 4–7 mm; the drawing labels 4–7.5 mm.
Thorlabs
KM1CE
For kinematic mirror alignment with an open frame for beam clearance
Compared Precisometer model
- NMC25.4
Published specifications and differences
Feature NMC25.4 Thorlabs KM1CE Optic diameter Ø25/Ø25.4 mm Ø25.4 mm Mount geometry Open frame kinematic mount Open frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 4–20 mm 2.5–6.4 mm Angular adjustment range ±3° ±4° Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 4–6.4 mm. Both have an open frame and two rear adjusters. Optic clamping and mounting dimensions differ. KM1CE supports only the listed 25.4 mm optic diameter and 2.5–6.4 mm thickness range.
Thorlabs
KM2CE
For kinematic mirror alignment with an open frame for beam clearance
Compared Precisometer model
- NMC50.8
Published specifications and differences
Feature NMC50.8 Thorlabs KM2CE Optic diameter Ø50/Ø50.8 mm Ø50.8 mm Mount geometry Open frame kinematic mount Open frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 4–20 mm 8.4–12.4 mm (CAD drawing) Angular adjustment range ±3° ±3° Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 8.4–12.4 mm. Both have an open frame and two rear adjusters. The KM2CE CAD drawing specifies 8.4–12.4 mm optic thickness; only that part of the NMC50.8 range overlaps. Optic clamping and mounting dimensions differ.
Thorlabs
KM05/M
For kinematic mirror alignment
Compared Precisometer model
- NMHS12.7
Published specifications and differences
Feature NMHS12.7 Thorlabs KM05/M Optic diameter Ø12.5/Ø12.7 mm Ø12.7 mm (½ inch) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 3–6 mm At least 1.78 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 15 mm 14.7 mm Mounting interface M4 Two M4 tapped holes Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–6 mm.
Thorlabs
KM100
For kinematic mirror alignment
Compared Precisometer model
- NMHS25.4
Published specifications and differences
Feature NMHS25.4 Thorlabs KM100 Optic diameter Ø25/Ø25.4 mm Ø25.4 mm (1 inch) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 3–6 mm At least 3 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Mounting interface M6, counterboreØ8 Two #8 (M4) counterbores Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–6 mm.
Thorlabs
KM200
For kinematic mirror alignment
Compared Precisometer model
- NMHS50.8
Published specifications and differences
Feature NMHS50.8 Thorlabs KM200 Optic diameter Ø50/Ø50.8 mm Ø50.8 mm (2 inches) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 4–10 mm At least 4 mm Angular adjustment range ±3° ±3° Optical centre height above mounting surface 35 mm 39.6 mm Mounting interface M6, counterboreØ8 Two #8 (M4) counterbores Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 4–10 mm.
Thorlabs
KS1
For kinematic mirror alignment with tip, tilt and Z adjustment
Compared Precisometer models
- AUS25.4
Published specifications and differences
Feature AUS25.4 Thorlabs KS1 Optic diameter Ø25/ Ø25.4 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–6 mm At least 4.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M4 M6,Ø8 sink hole Two #8 (M4) counterbores Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø25 / Ø25.4 mm. Overlapping published optic thickness: 4.1–6 mm.
- OMHS25
Published specifications and differences
Feature OMHS25 Thorlabs KS1 Optic diameter Ø25/Ø25.4 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 4.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø25 / Ø25.4 mm. Overlapping published optic thickness: 4.1–5 mm.
- OMHS25-C(S)
Published specifications and differences
Feature OMHS25-C(S) Thorlabs KS1 Optic diameter Ø25 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 4.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø25 mm. Overlapping published optic thickness: 4.1–5 mm.
- OMHS25-CS
Published specifications and differences
Feature OMHS25-CS Thorlabs KS1 Optic diameter Ø25 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 4.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø25 mm. Overlapping published optic thickness: 4.1–5 mm.
- OMHS25-S
Published specifications and differences
Feature OMHS25-S Thorlabs KS1 Optic diameter Ø25/Ø25.4 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 4.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø25 / Ø25.4 mm. Overlapping published optic thickness: 4.1–5 mm.
- OMHS25.4-C(S)
Published specifications and differences
Feature OMHS25.4-C(S) Thorlabs KS1 Optic diameter Ø25.4 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 4.1 mm Angular adjustment range ±3° ±4° Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 4.1–5 mm.
- OMHS25.4-CS
Published specifications and differences
Feature OMHS25.4-CS Thorlabs KS1 Optic diameter Ø25.4 mm Ø25.0 / Ø25.4 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 4.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25.4 mm 25.4 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 4.1–5 mm. Both have three rear adjusters. The 25.4 mm centre height for OMHS25.4-CS is confirmed by Precisometer; its downloadable drawing is awaiting reconciliation.
Thorlabs
KS1CE
For kinematic mirror alignment with an open frame and three rear adjusters
Compared Precisometer models
- NMGC25.4
Published specifications and differences
Feature NMGC25.4 Thorlabs KS1CE Optic diameter Ø25/Ø25.4 mm Ø25.4 mm Mount geometry Open frame kinematic mount Open frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm 2.5–6.0 mm (CAD drawing) Angular adjustment range ±3° ±4° Optical centre height above mounting surface 42 mm 25.4 mm Mounting interface M6,Ø8 counterbore Two #8 (M4) counterbores Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–5 mm. The shared published optic diameter is 25.4 mm. The KS1CE CAD drawing specifies 2.5–6.0 mm optic thickness. Optical centre height, clamping and mounting dimensions must be checked separately; the open frame does not establish the same beam clearance.
- OMHS25-B(S)
Published specifications and differences
Feature OMHS25-B(S) Thorlabs KS1CE Optic diameter Ø25/Ø25.4 mm Ø25.4 mm Mount geometry Open frame kinematic mount Open frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm 2.5–6.0 mm (CAD drawing) Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–5 mm. The shared published optic diameter is 25.4 mm. The KS1CE CAD drawing specifies 2.5–6.0 mm optic thickness. Optical centre height, clamping and mounting dimensions must be checked separately; the open frame does not establish the same beam clearance.
- OMHS25-BS
Published specifications and differences
Feature OMHS25-BS Thorlabs KS1CE Optic diameter Ø25/Ø25.4 mm Ø25.4 mm Mount geometry Open frame kinematic mount Open frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm 2.5–6.0 mm (CAD drawing) Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 25.4 mm Mounting interface M6, Ø8 counterbore Two #8 (M4) counterbores Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–5 mm. The shared published optic diameter is 25.4 mm. The KS1CE CAD drawing specifies 2.5–6.0 mm optic thickness. Optical centre height, clamping and mounting dimensions must be checked separately; the open frame does not establish the same beam clearance.
Thorlabs
KS2
For kinematic mirror alignment with tip, tilt and Z adjustment
Compared Precisometer models
- AUS50.8
Published specifications and differences
Feature AUS50.8 Thorlabs KS2 Optic diameter Ø50/ Ø50.8 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M4 M6,Ø8 sink hole Six #8 (M4) counterbores Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø50 / Ø50.8 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50
Published specifications and differences
Feature OMHS50 Thorlabs KS2 Optic diameter Ø50 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50-C(S)
Published specifications and differences
Feature OMHS50-C(S) Thorlabs KS2 Optic diameter Ø50 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50-CS
Published specifications and differences
Feature OMHS50-CS Thorlabs KS2 Optic diameter Ø50 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50-S
Published specifications and differences
Feature OMHS50-S Thorlabs KS2 Optic diameter Ø50 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50.8-C(S)
Published specifications and differences
Feature OMHS50.8-C(S) Thorlabs KS2 Optic diameter Ø50.8 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50.8-CS
Published specifications and differences
Feature OMHS50.8-CS Thorlabs KS2 Optic diameter Ø50.8 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 5.1–8 mm.
- OMHS50.8(-S)
Published specifications and differences
Feature OMHS50.8(-S) Thorlabs KS2 Optic diameter Ø50/Ø50.8 mm Ø50.0 / Ø50.8 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 5.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 35 mm 39.6 mm Z / front plate translation Maximum 6 mm 6.4 mm maximum Mounting interface M6, Ø8 counterbore Six #8 (M4) counterbores Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø50 / Ø50.8 mm. Overlapping published optic thickness: 5.1–8 mm.
Thorlabs
KS3
For kinematic mirror alignment
Compared Precisometer model
- NMHS76.2
Published specifications and differences
Feature NMHS76.2 Thorlabs KS3 Optic diameter Ø76.2 mm Ø75.0 / Ø76.2 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 5–12 mm At least 7.1 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 50 mm 54.1 mm Mounting interface M6, counterboreØ8 Four #8 (M4) counterbores Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø76.2 mm. Overlapping published optic thickness: 7.1–12 mm.
Thorlabs
KS4
For kinematic mirror alignment
Compared Precisometer model
- NMHS101.6
Published specifications and differences
Feature NMHS101.6 Thorlabs KS4 Optic diameter Ø101.6 mm Ø101.6 mm (4 inches) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 5–12 mm At least 7.1 mm; Ø100 mm optics are not supported Angular adjustment range ±3° ±4° Optical centre height above mounting surface 70 mm 72.4 mm Mounting interface M6, counterboreØ8 Four #8 (M4) counterbores Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø101.6 mm. Overlapping published optic thickness: 7.1–12 mm.
Thorlabs
KS05K/M
For kinematic mirror alignment with tip, tilt and Z adjustment
Compared Precisometer models
- AUS12.7
Published specifications and differences
Feature AUS12.7 Thorlabs KS05K/M Optic diameter Ø12.5/ Ø12.7 mm Ø12.0 / Ø12.7 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 3.0 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 15 mm 14.7 mm Z / front plate translation Maximum 6 mm 4.57 mm maximum Mounting interface M4 Two M4 tapped holes Body material and finish Aluminium alloy, surface treated by black anodic oxidation. Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–5 mm.
- OMHS12.7
Published specifications and differences
Feature OMHS12.7 Thorlabs KS05K/M Optic diameter Ø12.5/Ø12.7 mm Ø12.0 / Ø12.7 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 3.0 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 14.7 mm Z / front plate translation Maximum 6 mm 4.57 mm maximum Mounting interface M6, Ø8 counterbore Two M4 tapped holes Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–5 mm.
- OMHS12.7- C(S)
Published specifications and differences
Feature OMHS12.7- C(S) Thorlabs KS05K/M Optic diameter Ø12.7 mm Ø12.0 / Ø12.7 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 3.0 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 14.7 mm Z / front plate translation Maximum 6 mm 4.57 mm maximum Mounting interface M6, Ø8 counterbore Two M4 tapped holes Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–5 mm.
- OMHS12.7-CS
Published specifications and differences
Feature OMHS12.7-CS Thorlabs KS05K/M Optic diameter Ø12.7 mm Ø12.0 / Ø12.7 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 3.0 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 14.7 mm Z / front plate translation Maximum 6 mm 4.57 mm maximum Mounting interface M6, Ø8 counterbore Two M4 tapped holes Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–5 mm.
- OMHS12.7(-S)
Published specifications and differences
Feature OMHS12.7(-S) Thorlabs KS05K/M Optic diameter Ø12.5/Ø12.7 mm Ø12.0 / Ø12.7 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 3.0 mm Angular adjustment range ±3° ±4° Optical centre height above mounting surface 25 mm 14.7 mm Z / front plate translation Maximum 6 mm 4.57 mm maximum Mounting interface M6, Ø8 counterbore Two M4 tapped holes Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–5 mm.
Thorlabs
MK05/M
For compact kinematic mirror alignment
Compared Precisometer model
- NMM12.7m
Published specifications and differences
Feature NMM12.7m Thorlabs MK05/M Optic diameter Ø12.5/Ø12.7 mm Ø12.5 / Ø12.7 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 2–4 mm At least 3.05 mm Angular adjustment range ±3° ±4° Mounting interface M4 Two M3 tapped holes Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø12.5 / Ø12.7 mm. Overlapping published optic thickness: 3.05–4 mm. MK05/M requires an optic at least 3.05 mm thick; thinner optics in the NMM12.7m range are outside that specification. Mounting threads also differ.
Thorlabs
MK10/M
For compact kinematic mirror alignment
Compared Precisometer model
- NMM10m
Published specifications and differences
Feature NMM10m Thorlabs MK10/M Optic diameter Ø10 mm Ø10 mm Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Two rear adjusters Two rear adjusters Optic thickness 2–4 mm At least 1.00 mm Angular adjustment range ±3° ±4° Mounting interface M4 Two M3 tapped holes Body material and finish Black anodized aluminium alloy Black anodized aluminium Shared published optic diameter: Ø10 mm. Overlapping published optic thickness: 2–4 mm. Mounting threads differ: M4 on NMM10m and M3 on MK10/M.
Thorlabs
POLARIS-K1E
For kinematic mirror alignment with tip, tilt and Z adjustment
Compared Precisometer model
- SUS25.4
Published specifications and differences
Feature SUS25.4 Thorlabs POLARIS-K1E Optic diameter Ø25/ Ø25.4 mm Ø25.4 mm (1 inch) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–6 mm At least 3.5 mm Angular adjustment range ±3° ±4° nominal mechanical range Z / front plate translation Maximum 6 mm 6 mm maximum Mounting interface M6,Ø8 sink hole Two #8 (M4) counterbores at 90° Body material and finish Stainless steel with sandblasting passivation Heat-treated stainless steel Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3.5–6 mm. Optic retention, adjusters and mounting interfaces differ. This comparison does not assess thermal drift, repeatability, vacuum suitability or optic distortion.
Thorlabs
POLARIS-K2
For kinematic mirror alignment with tip, tilt and Z adjustment
Compared Precisometer model
- SUS50.8
Published specifications and differences
Feature SUS50.8 Thorlabs POLARIS-K2 Optic diameter Ø50/Ø50.8 mm Ø50.8 mm (2 inches) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 4–8 mm At least 3.5 mm Angular adjustment range ±3° ±3.4° nominal mechanical range Z / front plate translation Maximum 6 mm 6 mm maximum Mounting interface M6,Ø8 sink hole Four #8 (M4) counterbores Body material and finish Stainless steel with sandblasting passivation Heat-treated stainless steel Shared published optic diameter: Ø50.8 mm. Overlapping published optic thickness: 4–8 mm. Optic retention, adjusters and mounting interfaces differ. This comparison does not assess thermal drift, repeatability, vacuum suitability or optic distortion.
Thorlabs
POLARIS-K05
For kinematic mirror alignment with tip, tilt and Z adjustment
Compared Precisometer model
- SUS12.7
Published specifications and differences
Feature SUS12.7 Thorlabs POLARIS-K05 Optic diameter Ø12.5/ Ø12.7 mm Ø12.7 mm (½ inch) Mount geometry Closed frame kinematic mount Closed frame kinematic mount Adjuster arrangement Three rear adjusters Three rear adjusters Optic thickness 3–5 mm At least 2 mm Angular adjustment range ±3° ±5° nominal mechanical range Z / front plate translation Maximum 6 mm 5 mm maximum Mounting interface M4 Two #8 (M4) counterbores Body material and finish Stainless steel with sandblasting passivation Heat-treated stainless steel Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3–5 mm. Optic retention, adjusters and mounting interfaces differ. This comparison does not assess thermal drift, repeatability, vacuum suitability or optic distortion.
Thorlabs
VM1/M
For mirror alignment using two adjusters across the top of a rectangular mount
Compared Precisometer model
- NMV25.4
Published specifications and differences
Feature NMV25.4 Thorlabs VM1/M Optic diameter Ø25/Ø25.4 mm Ø25.4 mm (1 inch) Mount geometry Rectangular vertical-drive kinematic mount Rectangular vertical-drive kinematic mount Adjuster arrangement Two adjusters across the top Two adjusters across the top Optic thickness 3–6 mm At least 2.8 mm Angular adjustment range ±3° ±3° Mounting interface M6 , 2*M4 M4 tapped mounting holes Body material and finish Black Anodized Aluminium Alloy Black anodized aluminium Shared published optic diameter: Ø25.4 mm. Overlapping published optic thickness: 3–6 mm.
Thorlabs
VM05/M
For mirror alignment using two adjusters across the top of a rectangular mount
Compared Precisometer model
- NMV12.7
Published specifications and differences
Feature NMV12.7 Thorlabs VM05/M Optic diameter Ø12.5/Ø12.7 mm Ø12.7 mm (½ inch) Mount geometry Rectangular vertical-drive kinematic mount Rectangular vertical-drive kinematic mount Adjuster arrangement Two adjusters across the top Two adjusters across the top Optic thickness 2–5 mm At least 3.6 mm Angular adjustment range ±3° ±3° Mounting interface M4 M4 and M3 tapped mounting holes Body material and finish Black Anodized Aluminium Alloy Black anodized aluminium Shared published optic diameter: Ø12.7 mm. Overlapping published optic thickness: 3.6–5 mm.
Cage system components
Thorlabs
C4W
For joining optical paths using a four-port 30 mm cage cube
Compared Precisometer model
- CSC1-M3
Published specifications and differences
Feature CSC1-M3 Thorlabs C4W Cage rod spacing 30 mm 30 mm Side optical ports Four SM1 (1.035 inch-40) ports Four SM1 (1.035 inch-40) ports Top and bottom openings Ø44.5 mm; unthreaded Ø44.5 mm; unthreaded Cage rod attachment M3 tapped holes 4-40 tapped holes Cover attachment M3 tapped holes 4-40 tapped holes Rod and cover attachment threads differ: M3 versus 4-40. Cube dimensions and cover interfaces need separate checks. The comparison covers the bare cube, not bundled A/B/C variants.
Thorlabs
CP20D
For adjusting a beam aperture in a 30 mm cage
Compared Precisometer model
- CSAD1-20
Published specifications and differences
Feature CSAD1-20 Thorlabs CP20D Cage rod spacing 30 mm 30 mm Aperture diameter range Ø1.5–22 mm Ø0.8–20 mm Iris actuation Lever operated Lever operated Rod connection Three Ø6 mm holes Three Ø6 mm holes Plate thickness 7 mm 7 mm Shared published aperture range: Ø1.5–20 mm. The aperture limits differ, and this comparison does not establish equal blade geometry or aperture centring.
Thorlabs
CP33/M
For mounting Ø25.4 mm optics or SM1 lens tubes in a 30 mm cage
Compared Precisometer model
- CSP1-25.4
Published specifications and differences
Feature CSP1-25.4 Thorlabs CP33/M Cage rod spacing 30 mm 30 mm Rod connection Four Ø6 mm through holes; M3 side locking screws Four Ø6 mm through holes; M4 side locking screws Central bore SM1 (1.035 inch-40) threaded SM1 (1.035 inch-40) threaded Optic diameter Ø25.4 mm Ø25.4 mm Maximum optic thickness 5 mm 5 mm Plate thickness 9 mm 8.9 mm Post mounting M4 tapped hole M4 tapped hole Plate thickness and rod-locking screw threads differ. Both published optic thickness limits are 5 mm.
Thorlabs
CP36
For holding a lens tube by its outer diameter in a 30 mm cage
Compared Precisometer model
- CSP1-SM1
Published specifications and differences
Feature CSP1-SM1 Thorlabs CP36 Cage rod spacing 30 mm 30 mm Central bore Ø30.6 mm smooth bore Ø30.5 mm smooth double bore Lens tube retention Nylon-tipped setscrew Nylon-tipped setscrew Rod connection Four Ø6 mm through holes; side setscrews Four Ø6 mm through holes; side setscrews Plate thickness 9 mm 8.9 mm Post mounting M4 tapped hole No tapped post mounting hole CSP1-SM1 has a smooth bore despite its model name. Bore diameters, seating geometry and post mounting differ; this is not a comparison with an SM1-threaded plate.
Thorlabs
CP42/M
For mounting an RMS-threaded objective in a 30 mm cage
Compared Precisometer model
- CSP1-RMS
Published specifications and differences
Feature CSP1-RMS Thorlabs CP42/M Cage rod spacing 30 mm 30 mm Central bore RMS (0.800 inch-36) threaded RMS (0.800 inch-36) threaded Rod connection Four Ø6 mm through holes; side setscrews Four Ø6 mm through holes; side setscrews Plate thickness 9 mm 8.9 mm Post mounting M4 tapped hole M4 tapped hole These plates mount RMS-threaded objectives. The general family description about Ø25.4 mm optics does not describe this variant’s RMS bore.
Thorlabs
CPA1
For aligning a beam with a drop-in target in a 30 mm cage
Compared Precisometer model
- CSAT1
Published specifications and differences
Feature CSAT1 Thorlabs CPA1 Cage rod spacing 30 mm 30 mm Centre hole Ø0.9 mm Ø0.9 mm Installation Drop-in rod engagement Drop-in rod engagement This comparison concerns the alignment target and centre hole. It does not establish fluorescent response or identical engraved target rings.
Thorlabs
CRM1PT/M
For rotating Ø25.4 mm optics about the optical axis in a 30 mm cage
Compared Precisometer model
- CSMR1-AS
Published specifications and differences
Feature CSMR1-AS Thorlabs CRM1PT/M Cage rod spacing 30 mm 30 mm Optic diameter Ø25.4 mm Ø25.4 mm Maximum optic thickness 9.4 mm 9.4 mm Coarse rotation 360° 360° Fine rotation travel ±7° ±7° Main scale divisions 2° 2° Vernier scale resolution 5 arcminutes 5 arcminutes Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Post mounting M4 tapped hole M4 tapped hole The 2° scale and 5 arcminute vernier values describe scale divisions, not equal accuracy, repeatability or cumulative error.
Thorlabs
CXY1A
For translating Ø25.4 mm optics in X and Y within a 30 mm cage
Compared Precisometer models
- CSXY1-1
Published specifications and differences
Feature CSXY1-1 Thorlabs CXY1A Cage rod spacing 30 mm 30 mm Motion axes X and Y X and Y Travel per axis ±1 mm ±1 mm Actuation Two screw adjusters; 0.2 mm/revolution Two 100 TPI screw adjusters; 0.254 mm/revolution Optic diameter Ø25.4 mm Ø25.4 mm Maximum optic thickness 10 mm 10 mm Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Rod connection Four Ø6 mm through holes Four Ø6 mm through holes Adjuster pitch differs: 0.2 mm per revolution versus 0.254 mm per revolution. This comparison does not establish equal positioning accuracy or repeatability.
- CSXY1-1F
Published specifications and differences
Feature CSXY1-1F Thorlabs CXY1A Cage rod spacing 30 mm 30 mm Motion axes X and Y X and Y Travel per axis ±1 mm ±1 mm Actuation Two screw adjusters; 0.2 mm/revolution Two 100 TPI screw adjusters; 0.254 mm/revolution Optic diameter Ø25.4 mm Ø25.4 mm Maximum optic thickness 10 mm 10 mm Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Rod connection Four Ø6 mm through holes Four Ø6 mm through holes Adjuster pitch differs: 0.2 mm per revolution versus 0.254 mm per revolution. This comparison does not establish equal positioning accuracy or repeatability.
Thorlabs
CYCPA/M
For holding a rectangular or cylindrical lens in a 30 mm cage
Compared Precisometer model
- CSM1-CL
Published specifications and differences
Feature CSM1-CL Thorlabs CYCPA/M Cage rod spacing 30 mm 30 mm Optic retention Two adjustable sliding arms Two adjustable sliding arms Optic height 4–17 mm Up to 16.8 mm Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Post mounting M4 tapped hole M4 tapped hole Shared published height range: 4–16.8 mm. CSM1-CL’s 17 mm upper limit exceeds the reference’s 16.8 mm limit. Check optic thickness and clear aperture separately.
Thorlabs
ER1
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-25
Published specifications and differences
Feature CSSP-25 Thorlabs ER1 Rod diameter Ø6 mm Ø6 mm Rod length 25 mm 25.4 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER1-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-25-P4
Published specifications and differences
Feature CSSP-25-P4 Thorlabs ER1-P4 Rod diameter Ø6 mm Ø6 mm Rod length 25 mm 25.4 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER2
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-50
Published specifications and differences
Feature CSSP-50 Thorlabs ER2 Rod diameter Ø6 mm Ø6 mm Rod length 50 mm 50.8 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER2-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-50-P4
Published specifications and differences
Feature CSSP-50-P4 Thorlabs ER2-P4 Rod diameter Ø6 mm Ø6 mm Rod length 50 mm 50.8 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER3
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-75
Published specifications and differences
Feature CSSP-75 Thorlabs ER3 Rod diameter Ø6 mm Ø6 mm Rod length 75 mm 76.2 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER3-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-75-P4
Published specifications and differences
Feature CSSP-75-P4 Thorlabs ER3-P4 Rod diameter Ø6 mm Ø6 mm Rod length 75 mm 76.2 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-100
Published specifications and differences
Feature CSSP-100 Thorlabs ER4 Rod diameter Ø6 mm Ø6 mm Rod length 100 mm 101.6 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER4-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-100-P4
Published specifications and differences
Feature CSSP-100-P4 Thorlabs ER4-P4 Rod diameter Ø6 mm Ø6 mm Rod length 100 mm 101.6 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER05
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-12.5
Published specifications and differences
Feature CSSP-12.5 Thorlabs ER05 Rod diameter Ø6 mm Ø6 mm Rod length 12.5 mm 12.7 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER05-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-12.5-P4
Published specifications and differences
Feature CSSP-12.5-P4 Thorlabs ER05-P4 Rod diameter Ø6 mm Ø6 mm Rod length 12.5 mm 12.7 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER6
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-150
Published specifications and differences
Feature CSSP-150 Thorlabs ER6 Rod diameter Ø6 mm Ø6 mm Rod length 150 mm 152.4 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER6-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-150-P4
Published specifications and differences
Feature CSSP-150-P4 Thorlabs ER6-P4 Rod diameter Ø6 mm Ø6 mm Rod length 150 mm 152.4 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER8
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-200
Published specifications and differences
Feature CSSP-200 Thorlabs ER8 Rod diameter Ø6 mm Ø6 mm Rod length 200 mm 203.2 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER8-P4
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-200-P4
Published specifications and differences
Feature CSSP-200-P4 Thorlabs ER8-P4 Rod diameter Ø6 mm Ø6 mm Rod length 200 mm 203.2 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 4 rods 4 rods End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER10
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-250
Published specifications and differences
Feature CSSP-250 Thorlabs ER10 Rod diameter Ø6 mm Ø6 mm Rod length 250 mm 254 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER12
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-300
Published specifications and differences
Feature CSSP-300 Thorlabs ER12 Rod diameter Ø6 mm Ø6 mm Rod length 300 mm 304.8 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER025
For constructing a cage with stainless steel guide rods
Compared Precisometer model
- CSSP-6.5
Published specifications and differences
Feature CSSP-6.5 Thorlabs ER025 Rod diameter Ø6 mm Ø6 mm Rod length 6.5 mm 6.35 mm End thread M3 4-40 Material Stainless steel Stainless steel Quantity 1 rod 1 rod End threads and lengths differ. M3 and 4-40 threaded ends do not mate directly. Check the required rod length and end connections.
Thorlabs
ER90BA/M
For joining a cage rod and a threaded rod or post at 90°
Compared Precisometer model
- CSSP90
Published specifications and differences
Feature CSSP90 Thorlabs ER90BA/M Joint angle 90° fixed 90° fixed Rod bore Ø6 mm through bore Ø6 mm double bore Perpendicular attachment M3 threaded through hole M3 taps on top and bottom Rod retention Side setscrew Side setscrew The reference uses a double-bored clamping seat. Check bore seating, screw clearance and bracket dimensions before substituting.
Thorlabs
KC1L/M
For aligning a Ø25.4 mm optic with tip, tilt and Z in a 30 mm cage
Compared Precisometer model
- CSHS1-S
Published specifications and differences
Feature CSHS1-S Thorlabs KC1L/M Cage rod spacing 30 mm 30 mm Adjustment Tip, tilt and Z; three rear adjusters Tip, tilt and Z; three rear adjusters Optic diameter Ø25.4 mm Ø25.4 mm Minimum optic thickness 3 mm 3 mm Optic retention Smooth bore; locking setscrew Smooth double bore; nylon-tipped setscrew Angular adjustment range ±5° catalogue range; cage-installed limit not stated ±5° without cage rods; ±4° with cage rods Z travel ±3 mm ±3 mm Post mounting Three M4 tapped holes Three M4 tapped holes The CSHS1-S catalogue does not specify an angular limit with cage rods installed. KC1L/M’s angular range reduces from ±5° to ±4° with rods. Check rod clearance before choosing a working angle.
Thorlabs
KCB1/M
For right-angle beam steering with a round Ø25.4 mm mirror in a 30 mm cage
Compared Precisometer model
- CSRA1-A
Published specifications and differences
Feature CSRA1-A Thorlabs KCB1/M Cage rod spacing 30 mm 30 mm Optic shape and diameter Round; Ø25.4 mm Round; Ø25.4 mm Minimum optic thickness 3 mm 3 mm Nominal mirror orientation 45° 45° Angular adjustment range ±3° ±4° Adjusters Three M4 × 0.2 adjusters Three 3/16 inch-100 adjusters Cage rod attachment M3 tapped holes 4-40 tapped holes Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Post mounting M4 and M6 tapped holes M4 and M6 tapped holes Cage rod attachment threads differ: M3 versus 4-40. Angular travel and adjuster pitch also differ.
Thorlabs
KCB1C/M
For right-angle beam steering with a round Ø25.4 mm mirror in a 30 mm cage
Compared Precisometer model
- CSRA1-B
Published specifications and differences
Feature CSRA1-B Thorlabs KCB1C/M Cage rod spacing 30 mm 30 mm Optic shape and diameter Round; Ø25.4 mm Round; Ø25.4 mm Minimum optic thickness 3 mm 3 mm Nominal mirror orientation 45° 45° Angular adjustment range ±3° ±4° Adjusters Three M4 × 0.2 adjusters Three 3/16 inch-100 adjusters Cage rod attachment Ø6 mm smooth blind bores; 5.8 mm deep Ø6 mm smooth blind bores; 6.35 mm deep Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Post mounting M4 and M6 tapped holes M4 and M6 tapped holes Cage rod bore depths differ: 5.8 mm versus 6.35 mm. Angular travel and adjuster pitch also differ.
Thorlabs
ST1XY-A/M
For translating Ø25.4 mm optics in X and Y within a 30 mm cage
Compared Precisometer model
- CSXY1-3
Published specifications and differences
Feature CSXY1-3 Thorlabs ST1XY-A/M Cage rod spacing 30 mm 30 mm Motion axes X and Y X and Y Travel per axis ±3 mm ±3 mm Actuation Screw adjusters; 0.2 mm/revolution 100 TPI screw adjusters; 0.254 mm/revolution Optic diameter Ø25.4 mm Ø25.4 mm Maximum optic thickness 12.2 mm 12.2 mm Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Cage rod attachment M3 tapped holes 4-40 tapped holes Post mounting Three M4 tapped holes Three M4 tapped holes Cage rod attachment threads differ: M3 versus 4-40. Matching travel does not establish equal accuracy or repeatability.
Thorlabs
ST1XY-S/M
For translating Ø25.4 mm optics in X and Y within a 30 mm cage
Compared Precisometer model
- CSXY1-3A
Published specifications and differences
Feature CSXY1-3A Thorlabs ST1XY-S/M Cage rod spacing 30 mm 30 mm Motion axes X and Y X and Y Travel per axis ±3 mm ±3 mm Actuation Micrometer drives Micrometer drives Optic diameter Ø25.4 mm Ø25.4 mm Maximum optic thickness 12.2 mm 12.2 mm Lens tube thread SM1 (1.035 inch-40) SM1 (1.035 inch-40) Cage rod attachment M3 tapped holes 4-40 tapped holes Post mounting Three M4 tapped holes Three M4 tapped holes Cage rod attachment threads differ: M3 versus 4-40. Matching travel does not establish equal accuracy or repeatability.
Optical posts
Thorlabs
TR50/M-JP
For supporting post-mounted optical components
Compared Precisometer model
- PHSP12-2B
Published specifications and differences
Feature PHSP12-2B Thorlabs TR50/M-JP Post diameter 12 mm 12 mm Post length 50 mm 50 mm Body material Stainless steel Stainless steel End interfaces M4 tap; M6 tap Removable M4 setscrew; M6 tap The PHSP12-B drawing shows an M4 tapped end and an M6 tapped end. The Thorlabs reference includes a removable M4 setscrew. Check the required stud separately; the drawing does not establish the included hardware for PHSP12-B.
Thorlabs
TR75/M-JP
For supporting post-mounted optical components
Compared Precisometer model
- PHSP12-3B
Published specifications and differences
Feature PHSP12-3B Thorlabs TR75/M-JP Post diameter 12 mm 12 mm Post length 75 mm 75 mm Body material Stainless steel Stainless steel End interfaces M4 tap; M6 tap Removable M4 setscrew; M6 tap The PHSP12-B drawing shows an M4 tapped end and an M6 tapped end. The Thorlabs reference includes a removable M4 setscrew. Check the required stud separately; the drawing does not establish the included hardware for PHSP12-B.
Thorlabs
TR100/M-JP
For supporting post-mounted optical components
Compared Precisometer model
- PHSP12-4B
Published specifications and differences
Feature PHSP12-4B Thorlabs TR100/M-JP Post diameter 12 mm 12 mm Post length 100 mm 100 mm Body material Stainless steel Stainless steel End interfaces M4 tap; M6 tap Removable M4 setscrew; M6 tap The PHSP12-B drawing shows an M4 tapped end and an M6 tapped end. The Thorlabs reference includes a removable M4 setscrew. Check the required stud separately; the drawing does not establish the included hardware for PHSP12-B.
Thorlabs
TR150/M-JP
For supporting post-mounted optical components
Compared Precisometer model
- PHSP12-5B
Published specifications and differences
Feature PHSP12-5B Thorlabs TR150/M-JP Post diameter 12 mm 12 mm Post length 150 mm 150 mm Body material Stainless steel Stainless steel End interfaces M4 tap; M6 tap Removable M4 setscrew; M6 tap The PHSP12-B drawing shows an M4 tapped end and an M6 tapped end. The Thorlabs reference includes a removable M4 setscrew. Check the required stud separately; the drawing does not establish the included hardware for PHSP12-B.
Thorlabs
TR200/M-JP
For supporting post-mounted optical components
Compared Precisometer model
- PHSP12-6B
Published specifications and differences
Feature PHSP12-6B Thorlabs TR200/M-JP Post diameter 12 mm 12 mm Post length 200 mm 200 mm Body material Stainless steel Stainless steel End interfaces M4 tap; M6 tap Removable M4 setscrew; M6 tap The PHSP12-B drawing shows an M4 tapped end and an M6 tapped end. The Thorlabs reference includes a removable M4 setscrew. Check the required stud separately; the drawing does not establish the included hardware for PHSP12-B.
Thorlabs
TR300/M-JP
For supporting post-mounted optical components
Compared Precisometer model
- PHSP12-7B
Published specifications and differences
Feature PHSP12-7B Thorlabs TR300/M-JP Post diameter 12 mm 12 mm Post length 300 mm 300 mm Body material Stainless steel Stainless steel End interfaces M4 tap; M6 tap Removable M4 setscrew; M6 tap The PHSP12-B drawing shows an M4 tapped end and an M6 tapped end. The Thorlabs reference includes a removable M4 setscrew. Check the required stud separately; the drawing does not establish the included hardware for PHSP12-B.
Part number not listed?
Send us the Thorlabs part numbers in your setup or on your order list. Our engineers check which Precisometer models fit, compare the dimensions and interfaces, and tell you what differs.
Send us your part numbersComparison references: Precisometer catalogue specifications and drawings, and the reference manufacturer's published specifications, checked 10 October 2026. A comparison covers the listed features and does not establish interchangeability or identical performance. Thorlabs is a trademark of its respective owner. Precisometer is not affiliated with or endorsed by Thorlabs.