Mini-Series Kinematic Mount for Rectangular Optics

  • Kinematic Mount for 1/2" Tall Rectangular Optics
  • 4-40 (M3) Mounting Holes
  • Compact Footprint


Kinematic Mount for 1/2" Rectangular Optics



Application Idea

MK05S Kinematic Mount with
1/2" Square Aluminum Mirror

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  • Securely Mount 1/2" Tall Rectangular Optics
  • Angular Range: ±4°
  • Hardened Steel Inserts at Kinematic Contact Points to Reduce Wear
  • Phosphor Bronze Bushings and Stainless Steel Lead Screws for Smooth Adjustment
  • Fabricated from Black Anodized Aluminum

The MK05S(/M) Mini-Series Kinematic Mount holds 1/2" tall rectangular optics that are at least 2.54 mm (0.10") thick, such as metallic or dielectric mirrors and diffraction gratings. It features two kinematic adjusters and a compact 0.80" x 0.62" (20.2 mm x 15.8 mm) nominal footprint. Optics such as mirrors, diffraction gratings, and cylindrical lenses are secured using a nylon-tipped locking screw. Both the nylon-tipped setscrew and the two M2.5 x 0.20 adjuster screws accept a 0.050" (1.3 mm) hex key (not included). For ease of adjustment, we recommend using our 0.050" hex key thumbscrews, sold below. Additionally, we offer a locking collar and spanner wrench for locking the adjuster screws in a desired position or for creating a hard stop. These accessories are also available separately below.

The mount features two 4-40 (M3) mounting holes for mounting onto our Ø6 mm Mini-Series posts or Ø12 mm pedestal posts. Our Mini-Series post holders allow our Ø6 mm posts to be mounted onto our Mini-Series breadboards.

Thorlabs also offers Mini-Series Kinematic Mirror Mounts, which resemble the compact size of the MK05S(/M) and are available for mounting Ø7 mm, Ø11 mm, or Ø1/2" optics.

Posted Comments:
Aleksandar Sebesta  (posted 2023-01-20 14:33:48.49)
Dear Thorlabs Team, is there also a possibility to have this mount with 3 hex adjusters, with otherwise same dimensions? Cheers, Aleksandar Sebesta
jdelia  (posted 2023-01-20 11:28:35.0)
Thank you for contacting Thorlabs. Unfortunately you did not leave a valid email address so we are unable to discuss this with you directly as of now. However, if you would like to discuss the feasibility of this custom, we suggest contacting your local tech support team. In your case, you can reach them at
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1/2" Mini-Series Rectangular Optic Mount

MK05S  and KM05S Size Comparison
Click to Enlarge
Size Comparison between Our KM05S (Left) and MK05S (Right) 1/2" Optic Kinematic Mounts
  • Hold 1/2" Tall Square or Rectangular Optics Using a Nylon-Tipped Setscrew
  • Compact Nominal Footprint: 0.80" x 0.62" (20.2 mm x 15.8 mm)
  • Resolution: 13.4 mrad (0.76°) per Revolution via Two M2.5 x 0.20 Precision Adjusters
  • Two 4-40 (M3) Mounting Holes Enable Mini-Series Post Mounting

Thorlabs' MK05S(/M) Mini-Series Kinematic Mount is designed to mount 1/2" tall rectangular optics in optomechanical setups where space is a premium. The optics can be adjusted using two M2.5 x 0.20 adjuster screws that accept a 0.050" (1.3 mm) hex key (not included). The adjuster screws have a resolution of 13.4 mrad (0.76°) per revolution.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
MK05S Support Documentation
MK05SMini-Series Kinematic Mount for 1/2" Tall Rectangular Optics, Right Handed, 4-40 Taps
+1 Qty Docs Part Number - Metric Price Available
MK05S/M Support Documentation
MK05S/MMini-Series Kinematic Mount for 12.7 mm Tall Rectangular Optics, Right Handed, M3 Taps
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0.050" Hex Key Adjusters

Click to Enlarge
MK05 Mini-Series Kinematic Mirror Mount with
HKTS-050 Thumbscrew
  • For Convenient Adjustment of 0.050" Hex-Driven Actuators
  • Red, Anodized Adjustment Knob with Engraved Hex Size
  • Replaceable Hex Tip
  • Sold in Packs of 4

Hex Key Thumbscrews allow for quick, low-profile adjustment of hex-driven actuators, cap screws, and setscrews. Unlike balldrivers, they can be left in the screw's hex socket between adjustments for convenience. The 0.050" size is especially useful for adjusting our imperial, hex-driven, mini-series kinematic mirror mounts, sold above, as well as any 4-40-sized screws, such as the setscrews on our 30 mm cage plates.

Additional hex key thumbscrews are available in sizes from 1/8" to 3/16" and 2 mm to 5 mm.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
HKTS-050 Support Documentation
HKTS-050Customer Inspired! 0.050" (1.3 mm) Hex Key Thumbscrew, 4 Pack
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M2.5 x 0.20 Locking Collar

Stop Collar Lock Nut
Click to Enlarge

A single locking collar can lock an adjuster's position with an SPW403 spanner wrench.
  • Extremely Compact Lock Nut: 0.07" (1.7 mm) Thick
  • Use One Collar To Lock an Adjuster to a Bushing
  • Use Two Collars to Create a Hard Stop on an Adjuster
  • Locking Collars Sold in Packs of Five
  • Install and Remove with the SPW403 Spanner Wrench

These locking collars are only 0.07" (1.7 mm) thick and are constructed of 303 stainless steel. They are compatible with the M2.5 x 0.20 adjusters on our Mini-Series Kinematic Mirror Mounts, Mini-Series Kinematic Mount for Cylindrical Components, and our FiberBench and Post-Mountable Kinematic Tip/Tilt and Rotation Mounts.

The locking collars can be used to lock an adjuster in a desired position, or to create a hard stop at any position to prevent overdriving an adjuster. In addition to using two collars to create a hard stop, a single collar can be epoxied to an adjuster using our G14250 epoxy to create a permanent hard stop. We recommend the SPW403 Spanner Wrench to install or remove these locking collars. The end of the SPW403 is machined to accept a 5/64" hex wrench, which can be used to provide additional torque. The hollow cylindrical construction of the SPW403 allows a tool to pass through the entire length of the spanner wrench and access the adjuster.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
F10SC1-5 Support Documentation
F10SC1-5Locking Collar for M2.5 x 0.20 Adjusters, 5 Pack
SPW403 Support Documentation
SPW403Spanner Wrench for F2ESC1-5 M2 x 0.20 and F10SC1-5 M2.5 x 0.20 Locking Collars