Vacuum-Compatible Kinematic Mirror Mount

  • Ø1" Kinematic Mount for Vacuum Use
  • Shipped in a Single Vacuum Bag
  • Constructed from 6061-T6 Aluminum with Phosphor Bronze Bushings and 304 Stainless Steel Adjusters

Application Idea

Replace the included manual adjuster screws with PIAK10VF Vacuum-Compatible Piezoelectric Inertia Actuators.


For Ø1" Optics

Back View

Front View

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Additional Vacuum-Compatible Components

Many of our other optomechanical components can be special ordered for vacuum use. Contact for details.


  • Internally SM1-Threaded (1.035"-40) Optic Cell
  • Mount Ø1" Optics Up to 0.28" (7.1 mm) Thick Using Included SM1RRV Retaining Ring
  • ±4° of Pitch and Yaw Adjustment
    • Mount Includes 1/4"-100 Adjusters with Removeable Knobs
    • Adjusters can be Replaced with PIAK10VF Vacuum-Compatible Piezo Inertia Actuators
  • Counterbored #8 (M4) Through Holes Allow for Left-Handed or Right-Handed Orientation
  • Unanodized 6061-T6 Aluminum Body, Phosphor Bronze Bushings, and 304 Stainless Steel Adjusters
  • Compatible with >10-6 Torr Environments Directly Out of the Packaging

Thorlabs' KS1TV Kinematic Mount provides pitch-yaw adjustment for Ø1" (or Ø25 mm) optics in vacuum environments down to 10-6 Torr. This mount features SM1 (1.035-40) internal threading with a depth of 0.36" (9.1 mm), providing room to house Ø1" optics up to 0.28" (7.1 mm) thick. Optics can be secured against a retention lip with an included SM1RRV vacuum-compatible retaining ring, which has a Ø0.90" (22.9 mm) clear aperture. The retaining ring can be threaded in place using an SPW606 Spanner Wrench.

Three 304 stainless steel 1/4"-100 TPI adjusters mounted in phosphor bronze bushings translate the front plate of the mount, providing the ±4º adjustment range. 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, the kinematic mount can achieve a maximum Z translation of 0.25" (6.4 mm). Each adjuster can be turned using the adjuster knob or by inserting a 5/64" (2.0 mm) hex key through the knob to the screw's socket for fine adjustment. The knobs can also be removed by placing a 5/64" (2.0 mm) hex key into the adjuster, holding it in place, and unscrewing the knob from the adjuster. This can reduce the overall footprint of the mount when space is at a premium and allow for the installation of POLARIS-LN1 locking nuts. Each adjuster can be removed and replaced with our PIAK10VF vacuum-compatible piezoelectric inertia actuators, as shown in the image above, enabling angular adjustments with a typical resolution of 0.5 µrad.

#8 (M4) counterbored mounting holes allow for post mounting in either left- or right-handed orientations. The KS1TV mount ships with two screws, one 8-32, 0.5" long (Item # SH8S050V) and one M4 x 0.7, 12 mm long (Item # SH4MS12V), for mounting to our line of vacuum-compatible Ø1/2" posts. Optical post assemblies can be fastened to unanodized aluminum breadboards, which are also vacuum compatible to 10-6 Torr when properly cleaned by the user. When building assemblies for vacuum systems, remember to use vented screws to prevent trapping air in blind threaded holes.

For applications requiring high thermal stability and low beam drift while under vacuum, Thorlabs offers Polaris® Precision Mirror Mounts and accessories.

Vacuum Compatibility Information
This vacuum-compatible mount is chemically cleaned and prepared for vacuum applications before packaging. It is compatible directly out of the packaging with vacuum environments down to 10-6 Torr. With additional cleaning and processing, it can be used at even lower pressures, only limited by the outgassing rate of the constituent parts. The 6061-T6 aluminum body of the mount has the highest outgassing rate of the materials used. The material properties of the mount and the cleaning methods completed by the end user should be used to determine the appropriateness of using this mount and its materials in a specific vacuum system.

Item # Optic Diameter Maximum Optic Thickness Optical Axis Height Angular Adjustment Number of Adjusters Type of Adjusters Adjuster
Clear Aperture Mounting
KS1TV 1" or
25.0 mm
(7.1 mm)
(25.4 mm)
±4º 3 Removeable Knoba 1/4"-100 Ø0.90"
(Ø22.9 mm)
#8 (M4) Counterbored Holes,
2 Places

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 Lenses, CCD/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"
SM4 Threading: Ø4" Fixed Lens Mounts
External Thread, 4.035"-40.0, UNS-2A Internal Thread, 4.035"-40.0, UNS-2B
Max Major Diameter 4.0337" Min Major Diameter 4.0350"
Min Major Diameter 4.0286" Min Pitch Diameter 4.0188"
Max Pitch Diameter 4.0175" Max Pitch Diameter 4.0245"
Min Pitch Diameter 4.0131" Min Minor Diameter (and 83.3% of thread) 4.008"
Max Minor Diameter 4.0066" Max Minor Diameter (and 64.9% of thread) 4.014"

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Vacuum-Compatible Ø1" SM-Threaded Kinematic Mirror Mount

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KS1TV Support Documentation
KS1TVVacuum-Compatible SM1-Threaded Precision Kinematic Mirror Mount for Ø1" Optics, 3 Adjusters