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6-Axis Kinematic Mounts

  • High Precision, Locking 6-Axis Adjustment
  • Accepts Ø1" Optics up to 0.55" (14 mm) Thick


6 Degrees of Freedom

254 µm/rev.

Locking Screw

5 mrad/rev.


Application Idea

K6XS with K6A1
Prism Mount and PS910
Right Angle Prism

Related Items

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The K6XS allows for the adjustment of an optic's position along 6 axes, each with a locking screw for stability. The mounting cell has an SM1 (1.035"-40) threaded bore for mounting Ø1" optics, along with four 4-40-tapped holes for the K6A1(/M) prism mount. The K6A1 attachment is designed to provide a 0.5" x 1.68" (12.7 mm x 42.7 mm) platform mounted to the rotation dial of the K6XS. The mounts are fabricated from black anodized aluminum. More details for each product are given below.

Item #% Weight Reduction% CO2 Reduction
Smart Pack
K6X Smart Pack
Click to Enlarge
K6XS Packaging

Smart Pack

  • Minimize CO2 Footprint
  • Reduce Non-Recyclable Packing Materials
  • Improve Packaging Integrity
  • Saves on Shipping Costs

Thorlabs' Green Initiative is aimed at reducing waste. To that end, we have begun to re-engineer our product packaging. The K6XS is shipped in re-engineered packaging that minimizes the use of non-recyclable materials.

Over the course of a year, the re-engineered packaging across our product line is projected to reduce our CO2 footprint by more than 16,184 kg and reduce packaging by over 13,893 pounds! As we move through our product line, we will label re-engineered packages with our green Smart Pack sticker (above).

Posted Comments:
mdelgrange  (posted 2019-02-04 09:05:59.12)
Hi, Do you have a solution for having a K6XS compatible with a 60mm cage system ? Thank you.
llamb  (posted 2019-02-05 08:17:11.0)
Thank you for contacting Thorlabs. The K6XS currently does not have enough space to accommodate holes for a 60 mm cage system. I have reached out to you directly to discuss your application and possible configurations.
akuznetsov  (posted 2018-07-02 22:16:49.88)
Who designed the 8/32 mounting points to be spaced apart at 0.395" and 0.55"? Completely doesn't match imperial breadboard hole patterns for 2 screw attachment. Yes the corner hole can't be too far from the center line because of the corner, but the outer edge hole could have at least been 1" away from the corner hole. Instead of 0.55" center to edge, it should have been 0.605" that way corner to edge holes would provide 1" mounting space, and while that would make the center line off axis, frankly I con't care and those who do can use a translation stage or just use 1 screw in the first place.
llamb  (posted 2018-07-09 09:56:11.0)
Thank you for your feedback. I have added this suggestion to our internal product forum for further revision. The original design was limited by space constraints on the back plate of the mount between the springs and adjuster screw. For two screw attachment, you can still mount two posts to the K6XS and place them in our more versatile Universal Post Holders, so the hole spacing will not limit you for breadboard mounting. I will reach out to you directly in case you are interested in a custom product.
jchapmn2  (posted 2015-07-13 11:07:49.257)
Hello, in your older model, "K6X", you had four holes tapped on the back side for 30mm cage system. It was not very useful because the back plate was in the way of getting the cage component really close to the front plate and if you wanted them close you had to screw it into the back side of the front plate where there is no x/y translation. I STRONGLY suggest putting tapped holes on the front side for a 30mm cage system so that you can bring cage compenents really close to the front where something could be mounted and have x/y translation. We like to use the cage rods on the back side of the old ones to do fiber coupling with a mounted asphere and a connectorized fiber mounted in one of your terminating plates. Your collimation packages are great but sometimes you need other focal lengths and greater positioning control and if you can have the fiber and lens on a cage mount together it greatly increases stability. And having that mounted on a K6XS allows you to tilt the whole system together which is necessary for high coupling efficiency.
besembeson  (posted 2015-09-23 11:17:21.0)
Response from Bweh at Thorlabs USA: In the current design, one way to achieve this is to use a cage plate like the CP02 with a coupler such as SM1T2 or SM1T10. It seems it makes sense to include the 30mm cage holes to the front mounting surface but this will involve a redesign at this time.
Klaus.Bergner  (posted 2014-06-19 02:35:13.12)
Hello Thorlabs - team, would it be possible to add 3 additional holes in this mount to use it with a cage system? Kind regards from Jena, Germany, Klaus Bergner
jlow  (posted 2014-08-01 04:41:25.0)
Response from Jeremy at Thorlabs: The K6XS is not suitable for cage system. However, you should be able to achieve similar functionality using a combination of other kinematic and rotation mounts. We will contact you to get more details on your application and suggest appropriate items.
andreas.olk  (posted 2014-04-22 12:17:27.203)
Dear Sir or Madam, is there a way to mount a BB2-E03 Ø2" Broadband Dielectric Mirror on the K6XS? Kind regards, Andreas Olk ------------------------------------------------- Andreas Olk Optische Systeme Optical Systems Fraunhofer-Institut für Lasertechnik ILT Steinbachstr. 15, 52074 Aachen, Germany Tel +49 241 8906-8082 Fax +49 241 8906-121 ------------------------------------------------- Besuchen Sie uns/Visit us: AKL'14 - International Laser Technology Congress 07.-09. Mai 2014, Aachen Eurogress Conference Center
jlow  (posted 2014-04-22 09:08:17.0)
Response from Jeremy at Thorlabs: You can do this using two adapters: SM1A2 and SM2P2. You can find them at the following links. SM1A2: SM2P2:
jlow  (posted 2012-08-02 14:53:00.0)
Response from Thorlabs: There should always be some clearance between the mount and the circular bore. I will get in contact with you directly regarding sending your K6X back to us to be inspected/repaired.
christopher.long  (posted 2012-07-27 08:08:28.0)
It seems like the xy translation is limited because of the circular opening surrounding the inner mount. I often bump into edges when trying to align a fiber. Any thoughts on changing to a square shape so that we can reach the corners? Thanks!
tcohen  (posted 2012-04-02 17:29:00.0)
Update from Tim at Thorlabs: There is a possibility of rotation to occur when the X and Y axis is adjusted. We are testing the current K6X to determine where the rotation is coming from and how to redesign to correct for this. Thank you for your feedback to help us create a better product for future users!
bdada  (posted 2012-03-29 16:29:00.0)
Response from Buki at Thorlabs: Thank you for your feedback on the K6X mount. We are reviewing your comments and suggestions and will post an update shortly on our plans to improve the performance of this product.
user  (posted 2012-03-27 11:22:41.0)
Terrible mount, the rotation DOF creeps. If you mount an optical fiber + collimator to this mount, the rotational DOF about the collimator optical axis creeps because of little friction. You cannot maintain any alignment, forget about polarization orientation. Increasing the friction will not fix the problem. Unless you fix this issue by adding a lock screw you should recall this product.
bdada  (posted 2012-01-25 20:32:00.0)
Response from Buki at Thorlabs: Thank you for your response. You cannot lock the rotation of the K6X. Please use the link below to consider some of our lockable rotation mounts: Depending on your application, we may be able to combine multiple products to get you the rotation and kinematic adjustment you need. We will contact you to continue this discussion.
rbjaculbia  (posted 2012-01-24 00:12:35.0)
Hi, Is it possible to lock the rotation of the k6x? thank you
bdada  (posted 2011-11-22 13:02:00.0)
Response from Buki at Thorlabs: Thank you so much for your feedback. We apologize you could not quickly find all relevant information about the K6X. The SM1 thread is 1.035"-40. This information is on the drawing but we are already working on including this information in the web presentation on this page and across our website to make it easier to identify the Thorlabs threads we use. Thank you again for your feedback. We have contacted you to provide additional support, but please contact if you have any questions.
volkov  (posted 2011-11-22 06:08:20.0)
Terrible. I spent hours both with catalogue and with your website trying to understand what is the thread of this mount (not a thread for mounting on post): the thread to mount optical components with it. Still I do not see any clear number.
bdada  (posted 2011-10-21 13:59:00.0)
Response from Buki at Thorlabs: Thank you for your feedback. We just released XY cage translators that provide translation without the optic cell rotating. Please refer to the link below to get more information about the CXY1 and CXY2. We are working on incorporating this design into the rest of our lens translators. Please contact TechSupport@thorlabs if you have any questions.
jjurado  (posted 2011-09-01 11:51:00.0)
Response from Javier at Thorlabs to schaefer: The tip and tilt capability of the K6X mount should help in increasing the coupling efficiency of your system. However, there are other parameters that are also important such as the operating wavelength, the type of fiber used with the F810SMA-780, and the mechanics used to mount this fixed collimator. I will contact you directly to get more information about your experimental setup.
schaefer  (posted 2011-08-31 15:42:14.0)
Hi, I use a HPSC10 fiber in combination with the reflective collimator (RC08FC-P01) to create a ray of light with very low divergence. The collimator is mounted on a 60mm cage (using CP1XY and an adapter from 30 ro 60mm cage). Can I use K6X to align the collimator in order to use F810SMA-780 to couple the light back into a fiber? It seems as if the thread of CP1XY isnt precise enough to allign the ray.
bdada  (posted 2011-08-25 11:31:00.0)
Response from Buki at Thorlabs: The outer diameter for the X-Y adjustment knob is Ø0.28 and the tip/tilt adjustment knob is Ø0.58".
kmmertes  (posted 2011-08-22 16:20:55.0)
I need to connect flexible drive shafts to the X,Y, Pitch and Yaw adjustment screws heads. What is the OD of the X-Y adjustment screw heads and the OD of the pitch and yaw adjustment screw heads? Thanks.
tor  (posted 2010-11-15 15:01:43.0)
A response from Tor at Thorlabs to rbjaculbia: Thank you for your inquiry. Our Mechanics Department indicates that translation in the x- and y-axes will introduce ~2° of rotation. Please note that this can be easily corrected after adjustments in x- and y-axes are made.
rbjaculbia  (posted 2010-11-14 21:22:10.0)
hi, how much rotation does the k6x introduce to the optic? Thanks
apalmentieri  (posted 2010-02-10 14:09:15.0)
A response from Adam at Thorlabs to blair: The weight of the K6X is 1lbs. At this time, we do not offer a cheaper four axis kinematic mount. Thank you for the idea and I will contact you directly to get more information about the price you were looking for.
blair  (posted 2010-02-10 10:38:53.0)
Hello, I couldnt find the weight of your unit. We want to use it on a motorized stage and interested in the weight due to limits of our stage. Also, do you offer a cheaper four-axis mount? I just want tilt and XY.
Greg  (posted 2009-03-10 08:47:04.0)
A response from Greg at Thorlabs to marshabr: Thank you for your feedback regarding our products. We always like to hear our customers suggestions as customer centricity is at the heart of our company. I am sorry that our K6X mount is not suitable for your application. If you would like, I can have a member of our RMA staff issue a return on these for you. I will also let our Mechanics department that customers, like you, require a 6-Axis mount with completely independent axis adjustment. I updated the webpage to reflect the X- and Y-axis issue you mention.
marshabr  (posted 2009-03-06 16:58:49.0)
I purchased two of the K6X mounts. They are not usable for my application because the translation mechanism is inherently coupled to rotation due to the design. When the positioner translates, the moving part pivots about the spring and visibly rotates, meaning that alignment will have to be iterative. This is a very poor design for translation, but it is simple and cheap. I will have to purchase from another vendor that makes a similar device with a good translation stage. I will have to find a use for these mounts in a less demanding application. You really should point out this problem in the description.
Tyler  (posted 2008-10-03 08:28:16.0)
A response from Tyler at Thorlabs to Your idea has been entered into our internal engineering forum along with your contact information. Although not all ideas entered into the forum make it to the development stage, we always appreciate suggestions that come from the field. I will personally solicit the attention of an engineer to look at this idea. If the idea is adopted, we traditionally involve the originator of the the idea in the design stage as well provide them with preproduction models, in so much as they want to be involved. Thank you for your contribution.  (posted 2008-10-01 07:22:30.0)
Dear Sir/Madam It would be a popular good source or detector mount for your cage system, if a cage system compatible new product of functions similar to the "K6X 6-Axis Kinematic Optic Mount" can be made availabe. Regards Dr. J Wang ASG,NPL,UK
Tyler  (posted 2008-09-04 17:32:16.0)
A response from Tyler at Thorlabs to r96222041: This depends somewhat on how the device is mounted. However, we tested a K6X by hanging a mass 25 mm off of the front plate of the K6X. The mount functioned correctly for masses up to 330 grams. For heavier masses the springs were not stiff enough for the mount to function properly. We are always interested in hearing about the types of products our customers need for their applications. If you could provide us with more information about your application perhaps we could suggest an alternative solution or develop a product that would be suitable for your needs. Thank you for your interest in our products.
r96222041  (posted 2008-09-04 12:55:00.0)
I was wondering that how much weight can this K6X mount support? I want to mount a 700-gram device on it and I am afraid that is too much for this mount. Thanks for your reply.

Rotation Mount and Stage Selection Guide

Thorlabs offers a wide variety of manual and motorized rotation mounts and stages. Rotation mounts are designed with an inner bore to mount a Ø1/2", Ø1", or Ø2" optic, while rotation stages are designed with mounting taps to attach a variety of components or systems. Motorized options are powered by a DC Servo motor, 2 phase stepper motor, or an Elliptec™ resonant piezo motor. Each offers 360° of continuous rotation.

Manual Rotation Mounts

Rotation Mounts for Ø1/2" Optics
Item # MRM05(/M) RSP05(/M) CRM05 PRM05(/M)a SRM05 KS05RS CT104
Click Photo
to Enlarge
Features Mini Series Standard External SM1
(1.035"-40) Threads
Micrometer 16 mm Cage-Compatible ±4° Kinematic Tip/Tilt Adjustment Plus Rotation Compatible with CT1 Cage Translator Stage and 1/4" Translation Stagesb
Additional Details
  • This mount is available in the PRM05GL5 bundle, which includes the PRM05 rotation mount with the SM05PM5 polarizing prism mount.
  • The CT104 is complatible with the 1/4" translation stages using our MS103(/M) adapter plate.
  • The CT104 is compatible with the CT1 cage translation stage, which is designed for use with 30 mm cage systems.

Rotation Mounts for Ø1" Optics
Item # RSP1(/M) LRM1 RSP1D(/M) DLM1(/M) CLR1(/M) RSP1X15(/M) RSP1X225(/M) PRM1(/M)a
Click Photo
to Enlarge
Features Standard External SM1
(1.035"-40) Threads
Adjustable Zero Two Independently Rotating Carriages Rotates Optic Within
Fixed Lens Tube System
Continuous 360° Rotation
or 15° Increments
Continuous 360° Rotation
or 22.5° Increments
Additional Details
  • This mount is available in the PRM1GL10 bundle, which includes the PRM1 rotation mount with the SM1PM10 polarizing prism mount.

Rotation Mounts for Ø1" Optics
Item # LM1-A &
Click Photo
to Enlarge
Features Optic Carriage Rotates Within Mounting Ring 30 mm Cage-Compatiblea 30 mm Cage-Compatible
for Thick Opticsa
30 mm Cage-Compatible
with Micrometera
±4° Kinematic Tip/Tilt Adjustment Plus Rotation Six-Axis
Kinematic Mounta
Additional Details
  • This mount also features four 4-40 (M3) holes on the rotation dial for use with the K6A1(/M) prism platform.

Rotation Mounts for Ø2" Optics
Item # RSP2(/M) RSP2D(/M) PRM2(/M) LM2-A &
Click Photo to Enlarge
Features Standard Adjustable
Micrometer Optic Carriage Rotates Within Mounting Ring 60 mm Cage-Compatible ±4° Kinematic Tip/Tilt Adjustment Plus Rotation
Additional Details

Manual Rotation Stages

Manual Rotation Stages
Item # RP005(/M) MSRP01(/M) RP01(/M) RP03(/M) QRP02(/M)
Click Photo
to Enlarge
Continuous Rotation Mount
Features Standard Two Hard Stops
Additional Details


Manual Rotation Stages
Item # XRR1(/M) PR01(/M) CR1(/M) XYR1(/M) OCT-XYR1(/M)
Click Photo
to Enlarge
Features Fine Rotation Adjuster and
3" Wide Dovetail Quick Connect
Fine Rotation Adjuster and
SM1-Threaded Central Aperture
Fine Pitch Worm Gear Rotation and 1/2" Linear XY Translation
Additional Details
  • The stage profile is higher when it is mounted using the screw slots rather than stacked on another stage or accessory with 3" dovetails.
  • The OCT-XYR1(/M) stage includes the XYR1A solid sample plate. This plate can be detached from the stage to reveal the same mounting features present on the XYR1(/M) stage.

Motorized Rotation Mounts and Stages

Motorized Rotation Mounts and Stages
Item # DDR25(/M) K10CR1(/M) PRM1Z8(/M)a PRMTZ8(/M)b DDR100(/M) HDR50(/M) ELL18(/M)c
Click Photo
to Enlarge
Features Compatible with
SM05 Lens Tubes,
16 mm Cage System,
30 mm Cage System
Compatible with SM1 Lens Tubes and
30 mm Cage System
Tapped Mounting Platform for Mounting Prisms or Other Optics Compatible with
SM1 Lens Tubes,
16 mm Cage System,
30 mm Cage System
Compatible with
SM2 Lens Tubes
Tapped Mounting Platform, Open Frame Design for OEM Applications
Additional Details
  • This stage is available in the KPRMTE(/M), which includes the PRMTZ8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
  • This stage is available in the KPRM1E(/M), which includes the PRMT1Z8(/M) Motorized Rotation Stage with the KDC101 K-Cube DC Servo Motor Controller.
  • This stage is available in the ELL18K(/M), which includes an interface board, mounting brackets, and connectors for PC control.

6-Axis Kinematic Optic Mount

K6XS 6-Axis Kinematic Mount Usage
  • Six Adjustment Axes with Locks
    • Kinematic Pitch/Yaw: ±4° at 5 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
  • SM1-Threaded Bore for Ø1" (25 mm) Optics up to 0.55" (14 mm) Thick
  • Six #8 (M4) Counterbores for Post Mounting

The K6XS 6-Axis Kinematic Optic Mount is designed as a general-purpose, high-precision positioner. The optic cell can be translated along 6 axes, and each axis has a locking screw for stability. The translating cell has SM1 (1.035"-40) threading for attaching Ø1" lens tubes or mounting Ø1" (25 mm) optics up to 0.55" (14 mm) thick using the included SM1RR Retaining Ring, which can be tightened using an SPW602 or SPW606 Spanner Wrench (sold separately). The rotating dial has tapped 4-40 holes for attaching the K6A1 (sold separately below).

In testing, the K6XS was shown to drift less than 15 µrad in 48 hours at typical environmental conditions, with a 2 °C temperature fluctuation. The X and Y axes cause less than ±10 µm of crosstalk when translated over their full range.

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  
+1 Qty Docs Part Number - Universal Price Available
K6XS Support Documentation
K6XSCustomer Inspired! 6-Axis Locking Kinematic Optic Mount

Prism Mounting Attachment

K6X Prism Mount
Click to Enlarge
View Imperial Product List
Item #QtyDescription
K6A11Prism Mount Accessory for K6XS 6-Axis Mount, Imperial
K6XS16-Axis Locking Kinematic Optic Mount
PS9101N-BK7 Right-Angle Prism, Uncoated, 10 mm
TR41Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
View Metric Product List
Item #QtyDescription
K6A1/M1Prism Mount Accessory for K6XS 6-Axis Mount, Metric
K6XS16-Axis Locking Kinematic Optic Mount
PS9101N-BK7 Right-Angle Prism, Uncoated, 10 mm
TR100/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
K6A1 Prism Accessory Mounted onto a K6XS 6-Axis Mount
  • Mounts on the Face of the K6XS Translating Cell
  • 0.5" x 1.68" (12.7 mm x 42.7 mm) Platform
  • 1/4" (6 mm) Adjustment Range

The K6A1 (K6A1/M) is a 0.5" x 1.68" (12.7 mm x 42.7 mm) platform designed to be mounted on the rotation ring on the K6XS 6-axis kinematic mount and our 30 mm cage-compatible rotation mounts. The platform is mounted using the included 4-40 screws (hex key included). The platform has an adjustment range of 1/4" (6 mm) so that the optic placed on the platform can be positioned on the axis of rotation. The platform has four 6-32 (M4) tapped holes on the corners that can be used to mount, among other things, the included PM3 (PM3/M) prism clamping arm.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
K6A1 Support Documentation
K6A1Prism Mount Accessory for K6XS 6-Axis Mount, Imperial
+1 Qty Docs Part Number - Metric Price Available
K6A1/M Support Documentation
K6A1/MPrism Mount Accessory for K6XS 6-Axis Mount, Metric

Clamping Arms

Click to Enlarge

Clamping Arm Extension Posts with Metric Indicator Groove

Click for Details

Mechanical Drawings
  • Provide Clamping Force for Our Platform Mounts
  • 6-32 (M4) Threads on Top and Bottom of Post
  • PM3(/M): Holds Optics up to 0.97" (24.6 mm) Tall
  • PM4(/M): Holds Optics up to 1.61" (40.9 mm) Tall
  • Extension Posts Available to Increase Max Optic Height
    • PM3SP(/M) with PM3(/M): Hold Optics up to 2.21" (56.1 mm) Tall
    • PM4SP(/M) with PM4(/M): Hold Optics up to 3.61" (91.7 mm) Tall

Thorlabs' PM3(/M) and PM4(/M) Clamping Arms use a nylon-tipped setscrew with a 5/64" (2.0 mm) hex to secure optics to our kinematic platform mounts and V-clamps. The PM3(/M) accommodates optics up to 0.97" (24.6 mm) tall and features a 0.69" (17.5 mm) center-to-center distance between the post and the nylon-tipped setscrew. In contrast, the PM4(/M) accommodates optics up to 1.61" (40.9 mm) and features a 1.16" (29.3 mm) center-to-center distance between the post and the nylon-tipped setscrew. The maximum optic height of the PM3(/M) or PM4(/M) Clamping Arms can be extended using our PM3SP(/M) or PM4SP(/M) Extension Posts, respectively. These extension posts are identical to the posts included in each complete clamping arm.

The clamping arm for all items is held to the post using a flexure mechanism that locks with a 5/64" (2.0 mm) balldriver or hex key. The post also offers a through hole for added torque when tightening down the post. Please see the diagram above for additional information.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
PM3 Support Documentation
PM3Small Adjustable Clamping Arm, 6-32 Threaded Post
PM3SP Support Documentation
PM3SPCustomer Inspired! Extension Post for PM3 Clamping Arm, 6-32 Threaded
PM4 Support Documentation
PM4Large Adjustable Clamping Arm, 6-32 Threaded Post
PM4SP Support Documentation
PM4SPCustomer Inspired! Extension Post for PM4 Clamping Arm, 6-32 Threaded
+1 Qty Docs Part Number - Metric Price Available
PM3/M Support Documentation
PM3/MSmall Adjustable Clamping Arm, M4 Threaded Post
PM3SP/M Support Documentation
PM3SP/MCustomer Inspired! Extension Post for PM3/M Clamping Arm, M4 Threaded
PM4/M Support Documentation
PM4/MLarge Adjustable Clamping Arm, M4 Threaded Post
PM4SP/M Support Documentation
PM4SP/MCustomer Inspired! Extension Post for PM4/M Clamping Arm, M4 Threaded
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