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SM2-Compatible Kinematic Mounts


  • SM2 (2.035"-40) Threading
  • Mount SM2 Lens Tubes
  • Mount 2" (50.8 mm) Circular or Elliptical Optics

KC2-T

KM200T

KCB2C

Back View

KCB2C

Front View

Two SM2RR Retaining Rings Included

Two SM2RR Retaining Rings Included

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Features

  • Fine Adjustment Actuators for Precise Positioning
  • SM2-Threaded Kinematic Mounts
  • Mount 2" (50.8 mm) Round or Elliptical Optics
  • Compatible with SM2-Threaded Components such as Lens Tubes, Irises and Adapters

These SM2 (2.035"-40) threaded mounts allow a variety of optical components to be integrated into optomechanical setups. All of these kinematic mounts allow for versatility and flexibility in optomechanical constructions due to compatibility with SM2-threaded lens tubes, irises, and adapters. In addition, these mounts all include tapped holes or counterbores for post mounting (see below for details).

Kinematic Mounts offer pitch and yaw movement and precise angular adjustment. The K6X2 six-axis kinematic mount offers pitch, yaw, rotation, and XYZ translation. The KC2-T(/M), KCB2(/M), KCB2C(/M) and KCB2EC(/M) mounts are not only SM2 compatible, but also 60 mm cage system compatible.

This page contains our SM2 Compatible Kinematic Mounts; for other mounts, please see our wide selection of kinematic mounts.

Thorlabs' Threading Specifications

Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0, UNS-2A Internal Thread, 0.535"-40.0, UNS-2B
Max Major Diameter 0.5340" Min Major Diameter 0.5350"
Min Major Diameter 0.5289" Min Pitch Diameter 0.5188"
Max Pitch Diameter 0.5178" Max Pitch Diameter 0.5230"
Min Pitch Diameter 0.5146" Min Minor Diameter (and 83.3% of thread) 0.508"
Max Minor Diameter 0.5069" Max Minor Diameter (and 64.9% of thread) 0.514"
RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0, UNS-2A Internal Thread, 0.800"-36.0, UNS-2B
Max Major Diameter 0.7989" Min Major Diameter 0.8000"
Min Major Diameter 0.7934" Min Pitch Diameter 0.7820"
Max Pitch Diameter 0.7809" Max Pitch Diameter 0.7866"
Min Pitch Diameter 0.7774" Min Minor Diameter (and 83.3% of thread) 0.770"
Max Minor Diameter 0.7688" Max Minor Diameter (and 64.9% of thread) 0.777"
C-Mount Threading: Machine Vision LensesCCD/CMOS Cameras
External Thread, 1.000"-32.0, UN-2A Internal Thread, 1.000"-32.0, UN-2B
Max Major Diameter 0.9989" Min Major Diameter 1.0000"
Min Major Diameter 0.9929" Min Pitch Diameter 0.9797"
Max Pitch Diameter 0.9786" Max Pitch Diameter 0.9846"
Min Pitch Diameter 0.9748" Min Minor Diameter (and 83.3% of thread) 0.966"
Max Minor Diameter 0.9651" Max Minor Diameter (and 64.9% of thread) 0.974"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0, UNS-2A Internal Thread, 1.035"-40.0, UNS-2B
Max Major Diameter 1.0339" Min Major Diameter 1.0350"
Min Major Diameter 1.0288" Min Pitch Diameter 1.0188"
Max Pitch Diameter 1.0177" Max Pitch Diameter 1.0234"
Min Pitch Diameter 1.0142" Min Minor Diameter (and 83.3% of thread) 1.008"
Max Minor Diameter 1.0068" Max Minor Diameter (and 64.9% of thread) 1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5x0.5 Internal Thread, M30.5x0.5
Max Major Diameter 30.480 mm Min Major Diameter 30.500 mm
Min Major Diameter 30.371 mm Min Pitch Diameter 30.175 mm
Max Pitch Diameter 30.155 mm Max Pitch Diameter 30.302 mm
Min Pitch Diameter 30.059 mm Min Minor Diameter (and 83.3% of thread) 29.959 mm
Max Minor Diameter 29.938 mm Max Minor Diameter (and 64.9% of thread) 30.094 mm
SM1.5 Threading: Ø1.5" Lens Tubes
External Thread, 1.535"-40, UNS-2A Internal Thread, 1.535"-40, UNS-2B
Max Major Diameter 1.5339" Min Major Diameter 1.535"
Min Major Diameter 1.5288" Min Pitch Diameter 1.5188"
Max Pitch Diameter 1.5177" Max Pitch Diameter 1.5236"
Min Pitch Diameter 1.5140" Min Minor Diameter (and 83.3% of thread) 1.508"
Max Minor Diameter 1.5068" Max Minor Diameter (and 64.9% of thread) 1.514"
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0, UNS-2A Internal Thread, 2.035"-40.0, UNS-2B
Max Major Diameter 2.0338" Min Major Diameter 2.0350"
Min Major Diameter 2.0287" Min Pitch Diameter 2.0188"
Max Pitch Diameter 2.0176" Max Pitch Diameter 2.0239"
Min Pitch Diameter 2.0137" Min Minor Diameter (and 83.3% of thread) 2.008"
Max Minor Diameter 2.0067" Max Minor Diameter (and 64.9% of thread) 2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0, UNS-2A Internal Thread, 3.035"-40.0, UNS-2B
Max Major Diameter 3.0337" Min Major Diameter 3.0350"
Min Major Diameter 3.0286" Min Pitch Diameter 3.0188"
Max Pitch Diameter 3.0175" Max Pitch Diameter 3.0242"
Min Pitch Diameter 3.0133" Min Minor Diameter (and 83.3% of thread) 3.008"
Max Minor Diameter 3.0066" Max Minor Diameter (and 64.9% of thread) 3.014"

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Ø2" Kinematic Mount with SM2 Threads


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KM200T with Dichroic Mirror and Color-Coded Knobs Mounted on a Ø1/2" Post
  • SM2-Threaded Mount for Ø2" Optics up to 0.10" (2.5 mm) Thick
  • Optics Held with Retaining Rings
  • Angular Range: ±3°
  • Resolution: 5 mrad (0.3°) per rev via Two 1/4"-80 TPI Precision Adjusters
  • Six Counterbored #8 (M4) Through Holes Allow for Left- or Right-Handed Orientation
  • Removable Knobs Expose Hex Sockets in Adjuster Screws
  • Ø2" Lens Tube Compatible via SM2 Threading

The KM200T SM2-Threaded Kinematic Mirror Mount is designed for use with thin Ø2" optics up to 0.10" (2.5 mm) thick. An optic is secured in the mounting hole with the two included SM2RR SM2 (2.035"-40) threaded retaining rings, which can be attached with the SPW604 spanner wrench. This mount is also compatible with SM2-threaded components, including our Ø2" Lens Tubes.

The universal KM200T is compatible with both imperial and metric threaded Ø1/2" mounting posts via #8 (M4) counterbored through holes, and can be attached to the post in either a right- or left-handed orientation. The mount has removable knobs which expose hex sockets in the lead adjuster screws. An optional accessory, the LN2580 bronze locking nut, is available to lock the adjusters once the desired position is reached.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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KM200T Support Documentation
KM200TSM2-Threaded Kinematic Mount for Thin Ø2" Optics
$99.29
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Ø2" Kinematic Mount for Optics up to 0.10" (2.5 mm) Thick, 3 Adjusters

KS2T with a Mounted Ø2" Lens Tube
Click to Enlarge
A Ø2" Lens Tube Threaded into the KS2T
  • Internally SM2-Threaded (2.035"-40) for Ø2" Lens Tube Compatibility
  • Mounts Thin Ø2" Optics up to 0.10" (2.5 mm) Thick via Included Retaining Rings
  • Angular Range: ±4°
  • Three lockable 1/4"-80 Precision Adjusters Provide 8 mrad (0.5°) of Travel per Revolution
  • Six Counterbored #8 (M4) Through Holes Allow for Left-Handed or Right-Handed Orientation
  • Removable Knobs Expose Hex Sockets in the Adjuster Screws

The KS2T mirror mount uses a retaining ring for stress-free mounting of a thin optical component. An optic is secured in the mounting hole with the two included SM2RR SM2 (2.035"-40) threaded retaining rings, which can be attached using the SPW604 spanner wrench. This threading also allows the mount to be compatible with Ø2" lens tubes, as shown in the image to the right. This mount incorporates a thicker back plate than our two adjuster mirror mount, sold above, thereby providing increased stability. In addition to the increased mass of the mount, stiffer springs and hardened inserts at all contact points have been utilized to enhance the overall performance.

The KS2T is universal, making it compatible with both imperial and metric threaded Ø1/2" mounting posts via a #8 (M4) counterbored through hole, and can be attached to the post in a right-handed or left-handed orientation. The mount has removable knobs that expose hex sockets in the lead adjuster screws. The KS2T features three 1/4"-80 TPI, lockable adjusters that allow the ±4° adjustment range to be altered by translating the front plate of the mirror mount. The spacing between the front and back plate must be 0.120" (3.05 mm) for the adjustment range to be symmetric (i.e., ±4°). When using all three adjusters, a maximum Z translation of 0.25" (6.4 mm) can be achieved.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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KS2T Support Documentation
KS2TSM2-Threaded Precision Kinematic Mirror Mount for Ø2" Optics, 3 Adjusters
$153.67
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6-Axis Kinematic Mount for Ø2" Optics


6-Axis Kinematic Mount Usage
  • Six Adjustment Axes with Locks
    • Kinematic Pitch/Yaw: ±4° at 3.6 mrad/rev
    • X and Y Translation: ±2 mm at 254 µm/rev
    • Z Translationa: ±0.13" (±3.2 mm) at 318 µm/rev
    • Continuous 360° Roll Control with 1° Graduations
  • Independent X, Y, and Roll Adjustment
  • SM2-Threaded Bore for Ø2" (50 mm) Optics up to 0.53" (13.4 mm) Thick
  • Six #8 (M4) Counterbores for Post Mounting

The K6X2 6-Axis Kinematic Optic Mount is designed as a general-purpose, high-precision positioner. The optic cell can be translated along or rotated about 6 axes, and each axis has a locking screw for stability. The mount uses 1/4"-80 adjuster screws for pitch, yaw, and z-axis adjustment, and 3/16"-100 adjuster screws for x- and y-axis adjustment.

The translating cell has SM2 (2.035"-40) threading for attaching Ø2" lens tubes or mounting Ø2" (50 mm) optics up to 0.53" (13.4 mm) thick using the included SM2RR Retaining Ring, which can be tightened using an SPW604 Spanner Wrench (sold separately). In testing, the X and Y axes of the K6X2 caused less than ±35 µm of crosstalk.

If higher adjustment resolution is desired, the three 1/4"-80 adjusters used for tip/tilt translation can be switched with DAS110 or DM22 Differential Adjusters.  

  • Z-axis translation is accomplished by turning all three tip/tilt adjusters equally in the same direction.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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K6X2 Support Documentation
K6X2NEW!6-Axis Locking Kinematic Mount for Ø2" Optics
$498.00
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60 mm Kinematic Cage Mount

  • ±3º Angular Rotation
  • Compatible with 60 mm Cage System
  • Minimum Optic Thickness: 0.08" (2 mm)
  • Maximum Optic Thickness: 0.32" (8 mm)
  • Post-Mountable With a #8-32 (M4) Tapped Hole

The KC2-T offers three adjusters with independently locking setscrews. The rugged mechanical design provides excellent stability when mounted in a cage system or on a post. Both the front and rear plates have been machined with four clearance holes designed for direct compatibility with our 60 mm cage system standards. The rear plate provides locking setscrews to clamp to cage rods for secure positioning. The cage rod holes in the front plate are sufficiently oversized to allow ±4º tip and tilt without interference with the rods.

The KC2-T has an SM2 (2.035"-40) center tap for mounting optics and is compatible with our SM2 Lens Tubes and related accessories. Two SM2RR Retaining Rings are included with the KC2-T and can be used to mount a Ø2" optic up to 5.5 mm thick. Thicker optics can be mounted by using an SM2-series lens tube.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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KC2-T Support Documentation
KC2-TCustomer Inspired! Locking SM2-Threaded Kinematic Mirror Mount for Ø2" Optics, 8-32 Taps
$215.34
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KC2-T/M Support Documentation
KC2-T/MCustomer Inspired! Locking SM2-Threaded Kinematic Mirror Mount for Ø2" Optics, M4 Taps
$215.34
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60 mm Cage Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes

  • Eight 4-40 Tapped Holes to Mate with 60 mm Cage Systems
  • Mounts Ø2" (Ø50.8 mm) Optics at a 45° Angle to the Optical Axis
  • Provides ±4º Kinematic Tip and Tilt Adjustment
  • Compatible with SM2-Threaded (2.035"-40) Lens Tubes
  • Post Mountable:
    • KCB2: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
    • KCB2/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø1" Posts)

The KCB2(/M) Right-Angle Kinematic Cage Mount provides kinematic tip and tilt adjustment of a Ø2" (Ø50.8 mm) optic held in a mounting plate with a mean horizontal position at a 45° angle. The ports are equipped with SM2-threaded (2.035"-40) bores. The KCB2(/M) has eight 4-40 tapped holes spaced to mate with our 60 mm cage systems. ERSCA ER Rod Adapters are necessary to effectively connect, adjust, and lock two of these right angle cage mounts together within the cage system. The ±4° kinematic tip and tilt adjustment plate is actuated with three 100 TPI (Threads per Inch) adjustment screws for smooth, high-resolution movement of 0.01" (0.254 mm) per rotation. Two of these adjusters include removable knobs, while the third must be tuned with a 5/64" (2 mm) hex key or balldriver.

A nylon-tipped setscrew is used to secure Ø2" (Ø50.8 mm) optics using a 5/64" (2 mm) hex key or balldriver via the mounts' rear-loading, double-bored hole. The rear loading design does not limit the maximum thickness of the mounted optic and the mounted optic remains accessible even after the mount is fitted with cage rods or lens tubes. The minimum thickness for optics that can be secured by these mounts is 0.24" (6 mm).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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KCB2 Support Documentation
KCB2Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes, 60 mm Cage System and SM2 Compatible, 8-32 and 1/4"-20 Mounting Holes
$173.99
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KCB2/M Support Documentation
KCB2/MRight-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes, 60 mm Cage System and SM2 Compatible, M4 and M6 Mounting Holes
$173.99
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60 mm Cage Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores

Kinematic Right-Angle Mount
Click to Enlarge
KCB2C Mount with an Attached SM2L20 Lens Tube. The Mount Holds a BB2-E02 Broadband Dielectric Mirror.
  • Eight Smooth Bore Holes to Mate with 60 mm Cage Systems
  • Mounts Ø2" (Ø50.8 mm) Optics at a 45° Angle to the Optical Axis
  • Provides ±4º Kinematic Tip and Tilt Adjustment
  • Compatible with SM2-Threaded (2.035"-40) Lens Tubes
  • Post Mountable:
    • KCB2C: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
    • KCB2C/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø1" Posts)

The KCB2C(/M) Right-Angle Kinematic Cage Mount provides kinematic tip and tilt adjustment of a Ø2" (Ø50.8 mm) optic held in a mounting plate with a mean horizontal position at a 45° angle. The ports are equipped with SM2-threaded (2.035"-40) bores and smooth bore holes spaced to mate with our 60 mm cage system standard. The cage rods are secured by setscrews using a 5/64" (2 mm) hex key or balldriver. This design allows multiple 60 mm cage components to be directly interfaced without the need for ERSCA ER Rod Adapters. The ±4° kinematic tip and tilt adjustment plate is actuated with three 100 TPI (Threads per Inch) adjustment screws for smooth, high-resolution movement of 0.01" (0.254 mm) per rotation. Two of these adjusters include removable knobs, while the third must be tuned with a 5/64" (2 mm) hex key or balldriver.

A nylon-tipped setscrew is used to secure Ø2" (Ø50.8 mm) optics using a 5/64" (2 mm) hex key or balldriver via the mounts' rear-loading, double-bored hole. When used with transmissive optics, two clearance cuts around this hole provide a Ø1.26" (Ø32.0 mm) nominal clear aperture for any transmitted light. The rear loading design does not limit the maximum thickness of the mounted optic and the mounted optic remains accessible even after the mount is fitted with cage rods or lens tubes. The minimum thickness for optics that can be secured by these mounts is 0.24" (6 mm).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KCB2C Support Documentation
KCB2CCustomer Inspired! Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores, 60 mm Cage System and SM2 Compatible, 8-32 and 1/4"-20 Mounting Holes
$173.99
Today
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KCB2C/M Support Documentation
KCB2C/MCustomer Inspired! Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores, 60 mm Cage System and SM2 Compatible, M4 and M6 Mounting Holes
$173.99
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60 mm Cage Right-Angle Kinematic Elliptical Mirror Mount with Smooth Cage Rod Bores

Elliptical Mirror Mount
Click to Enlarge

The mirror is locked in place by a swing arm and nylon-tipped setscrew. The adjuster knobs feature side holes for fine adjustments.
  • Mounts 2" (50.8 mm) Elliptical Optics at a 45° Angle to the Optical Axis
  • Eight 0.195" (5.0 mm) Deep Smooth Bore Holes for ER Cage Rods
  • Provides ±3º Kinematic Pitch and Yaw Adjustment
  • Z-Axis Translation Using All Three Adjusters: ±0.12" (±3.0 mm)
  • 60 mm Cage System and SM2 (2.035"-40) Compatible
  • Post Mountable:
    • KCB2EC: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
    • KCB2EC/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø25.0 mm Posts)

The KCB2EC(/M) Right-Angle Kinematic Cage Mount provides kinematic pitch and yaw adjustment of a 2" (50.8 mm) elliptical optic held in a mounting plate with a nominal horizontal position at a 45° angle. The ports are equipped with SM2-threaded (2.035"-40) bores and four 0.195" (5.0 mm) deep smooth bore holes spaced to mate with our 60 mm cage system standard.

The ±3° kinematic pitch and yaw adjustment plate is actuated with three 100 TPI (threads per inch) adjustment screws that provide angular resolution of 4.5 mrad/rev. The pitch and yaw adjusters include removable knobs with Ø5/64" (Ø2 mm) side holes for fine adjustments, while the third adjuster must be tuned with a 5/64" (2 mm) hex key or balldriver. While the optic face is nominally centered within the mount, the third adjuster can be used for fine tuning the position along the optical axis.

A nylon-tipped setscrew mounted on a swing arm is used to secure 2" (50.8 mm) elliptical optics using a 5/64" (2 mm) hex key or balldriver via the mount's rear-loading, double-bored hole. Note that the setscrew should only be finger tight to avoid distorting the optic. Please note that this mount is compatible only with 2" elliptical optics that are 0.47" (12 mm) thick. Our selection of dielectric and metallic elliptical mirrors are compatible with this mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KCB2EC Support Documentation
KCB2ECRight-Angle Kinematic Elliptical Mirror Mount with Smooth Cage Rod Bores, 60 mm Cage System and SM2 Compatible, 8-32 and 1/4"-20 Mounting Holes
$244.01
Today
+1 Qty Docs Part Number - Metric Price Available
KCB2EC/M Support Documentation
KCB2EC/MRight-Angle Kinematic Elliptical Mirror Mount with Smooth Cage Rod Bores, 60 mm Cage System and SM2 Compatible, M4 and M6 Mounting Holes
$244.01
Today
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