Optics Mount with Quick Release Mounting Carriage

  • 8-32 (M4) Tap for Post Mounting
  • SM1-Threaded Mounting Carriage for Ø1" Optics
  • Magnetically Coupled Mounting Carriage


(Post Not Included)



Application Idea

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Max Optic Thickness 0.35" (8.9 mm)
Repeatabilitya 1 µm
  • The repeatability specification (1 µm) indicates that the X, Y, and Z position of the mount will not vary by more than 1 µm after being removed and replaced.


  • SM1-Threaded (1.035"-40) Mounting Carriage for Ø1" Optics
  • One Retaining Ring (SM1RR) Included
  • Magnetically Coupled Removable Mounting Carriage
  • 8-32 (M4) Tapped Hole on Back Plate for Post Mounting
  • Ideal for Use with Lenses, Filters, Apertures, and Other Optics

The KB1P mount has back plate to which a removable mounting carriage can be magnetically coupled. This mount is designed for applications that require a Ø1" optical element, like a lens, to be periodically inserted and removed for an optical setup with a high degree of precision. The magnetically coupled mounting carriage eliminates the need to align the optic when it is reinserted into the setup. For stability, precision, and repeatability, the mounting carriage contacts the back plate at three points. Each point of contact is a ball bearing on the mounting carriage resting in the groove formed by two parallel steel pins. The coupling force is provided by pairs of rare earth magnets.

Posted Comments:
Nick Cox  (posted 2023-02-24 15:42:19.0)
What is the holding force of the magnets? Your other kinematic baseplates (KB2x2, KB3x3) have 3 and 6lbs holding force.
jdelia  (posted 2023-03-08 04:50:54.0)
Thank you for contacting Thorlabs. We tested the holding force on the KB1- series to be approximately 2.14 lbs.
mastron  (posted 2018-01-30 15:20:16.967)
Would it be possible to make a KB1F front plate that is tapped for SM1 retaining ring as normal, but untapped for the last 4 mm to the bottom lip that holds the optic?
nbayconich  (posted 2018-02-12 01:15:12.0)
Thank you for contacting Thorlabs. We can possibly provide this as a custom option. I will reach out to you directly with more information about our custom capabilities.
adrian.solyom  (posted 2017-04-18 18:09:56.487)
What is the angular repeatability of these mounts? eg when using lenses in a removable telescope.
nbayconich  (posted 2017-06-05 04:23:12.0)
Thank you for contacting Thorlabs. The angular repeatability of the KB1P mount for the min, max and average is Min 1.33 µrad, Mean 20.58 µrad, and Max 72.14 µrad. A Techsupport representative will contact you directly.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KB1P Support Documentation
KB1PMagnetic Quick-Release Carriage Set, 8-32 Tap
KB1F Support Documentation
KB1FFront Plate of Magnetic Quick-Release Carriage Set
KB1B Support Documentation
KB1BBack Plate of Magnetic Quick-Release Carriage Set, 8-32 Tap
+1 Qty Docs Part Number - Universal Price Available
SPW602 Support Documentation
SPW602Spanner Wrench for SM1-Threaded Retaining Rings, Graduated Scale with 0.02" (0.5 mm) Increments, Length = 3.88"
7-10 Days
+1 Qty Docs Part Number - Metric Price Available
KB1P/M Support Documentation
KB1P/MMagnetic Quick-Release Carriage Set, M4 Tap
KB1F/M Support Documentation
KB1F/MFront Plate of Magnetic Quick-Release Carriage Set, Metric
KB1B/M Support Documentation
KB1B/MBack Plate of Magnetic Quick-Release Carriage Set, M4 Tap