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Kinematic Platform Mounts


  • Mounts for Prisms, Fixed Optic Mounts, or Beamsplitters
  • Mount Specifically Designed for Thorlabs' Wavefront Sensors
  • Vertical or Horizontal Mounting Surfaces

TPA01

Pitch Adjuster for Fixed Optic Mounts

KM100B

6-32 Taps
(Post Not Included)

Application Idea

KM100PM Shown in the Right-Handed Configuration with a PM3 Clamping Arm and PS610 Prism

KM100WFS

#8 and M3 Through Holes for Mounting Wavefront Sensors

FBTB

Glue-In Mount for 5 mm Cube Optics

KM200PM

6-32 Taps, 8-32 Taps,
and #8 Through Holes

KM05PM

6-32 and 4-40 Taps

Related Items


Please Wait

Features

  • Kinematic Vertical or Horizontal Mounting Surfaces
  • Mount Prisms, Beamsplitters, Non-Standard Optics, Fixed Optic Mounts, or Wavefront Sensors
  • ±3° or ±4° of Tip and/or Tilt Adjustment
  • Kinematic Platform Options:
    • Mounting Platform Plate Perpendicular or Parallel to Adjusters With Mounting Holes for Clamping Arms
    • Tip/Tilt and Rotation, Glue-In Platform Mount for Small Optics
    • One-Axis Pitch Adapter with #8 Counterbored Slot for Optic Mounts
  • Compatible with Ø1/2" Posts

Thorlabs offers kinematic platform mounts for prisms, wavefront sensors, small optics, and fixed optic mounts. The mounts feature one, two, or three axes of ±3° or ±4° tip/tilt adjustment.

Platform and prism mounts have two axes of adjustment and each feature a mounting platform with 6-32 (M4) taps to mount our PM3(/M) and PM4(/M) Clamping Arms. The back plate of each of these mounts has either #8 (M4) through holes or 8-32 (M4) taps for mounting to a Ø1/2" post. Platform mounts provide a large mounting area and a beam path unobstructed by kinematic adjusters. Prism mounts are more compact and can be configured in left- or right-handed orientations by repositioning the platform. We also offer a version with mounting holes designed to hold our Wavefront Sensors. 

Glue-In Platform Mounts are designed for 1/2" wide plate optics or 5 mm cubes. They feature three kinematic adjusters for tip and tilt and a separate adjuster for rotation. Each mount offers an 8-32 (M4) tap for post mounting.

The Kinematic Pitch Adapter is designed to adjust the pitch of a standard optic mount. It has two 8-32 (M4) tapped holes for post mounting vertically or horizontally and a #8 counterbored slot for attaching fixed optic mounts. 


Posted Comments:
h.wu  (posted 2018-06-17 22:46:50.777)
I would like to know if it is possible to purchase FBTA/M with customized silver mirrors? 12.7 mm × 12.7 mm × 1 mm 6.35 mm × 6.35 mm × 1 mm Thanks,
YLohia  (posted 2018-06-18 11:24:50.0)
Hello, thank you for contacting Thorlabs. Please reach out to your local Thorlabs Tech Support team (+44 (0) 1353-654635; techsupport.uk@thorlabs.com) for a quote for custom optics.
zachary.price  (posted 2018-01-24 12:53:32.977)
Is there an item that is similar to FBTB that can support a 10mm cube? Can one be custom made?
nbayconich  (posted 2018-01-25 10:22:30.0)
Thank you for your feedback. We do not have a similar rotational mount to FBTB for larger cube optics at the moment but I have forwarded your request to our product line discussion forum. I will reach out to you directly about our custom capabilities.
aurelie.jost  (posted 2014-11-18 12:47:38.383)
Hello, I would like to know if it is possible to purchase the KM200B/M without mounting plate. Also, the screws that hold the mounting plate to the rest of the component seem to be imperial (4-40): is it possible to replace with metric screws? Many thanks for your advice.
jlow  (posted 2014-11-18 09:26:16.0)
Response from Jeremy at Thorlabs: We will contact you directly for a quote.
jjurado  (posted 2011-06-14 10:28:00.0)
Response from Javier at Thorlabs to last poster: Thank you very much for your feedback. We round the metric units in our reference pdf drawings to the nearest mm in order to maintain the presentation a bit cleaner. However, I will discuss your suggestion with our mechanics design engineers so that perhaps a change is implemented in the future. Please contact us at techsupport@thorlabs.com if you have any further questions or comments.
user  (posted 2011-05-26 10:32:39.0)
KM200B/M AutoCAD PDF rounds the metric dimensions to the nearest mm (two significant digits), while the SW file shows the correct dimensions in inches (with three significant digits). It makes sense to retain the same number of significant digits when converting to/from metric.
bdada  (posted 2011-04-13 16:05:00.0)
Response from Buki at Thorlabs: We can offer a shorter spring assembly for this particular application on a custom basis. This would be comparable to offering a spring with a higher spring constant. We have contacted you directly to discuss this option.
gisi  (posted 2011-04-13 14:46:06.0)
Hi We also have the problem, that the springs are not strong enough. Do you have stronger springs available?
tor  (posted 2010-11-23 08:53:15.0)
A response from Tor at Thorlabs to Will: The KM100B is designed to mount standard 1” optics. I will contact you directly for more details in order to identify a more suitable solution for your application.
wgrigsby  (posted 2010-11-22 23:35:27.0)
We currently have this mount, but the springs are not strong enough to support my attached optic. Do you have stiffer springs available? If not, can you let me know the specifications (length, diam, wire size, etc) of the springs that are currently used so that I can order stiffer springs elsewhere? Thank you for your help. -Will
Greg  (posted 2010-03-23 09:56:41.0)
A web update from Greg at Thorlabs in response to Blairs question: I have added dimensioned drawings of the KM100x and KM200x to this web page. These drawings show the location and threading of the holes used to connect the mounting platforms to the kinematic mount.
apalmentieri  (posted 2010-03-02 09:38:36.0)
A response from Adam at Thorlabs to Blair: The four screws used for mounting the plate to the kinematic platform are #4-40 screws. It sounds like you already have a custom adapter plate, but if you need this manufactured please let us know as we do custom manufacturing as well. I will contact you directly to get more information.
blair  (posted 2010-03-02 05:07:58.0)
I plan on using this mount but removing the plate and adding my own custom adapter plate. What four screws do you use for mounting the plate to kinematic movement? Are they #4-40 or are they M3? Thanks, Blair

Kinematic Platform Mounts

KM200B Kinematic Platform Mount
Click to Enlarge

KM200B Mounted on Ø1/2" Post Using an 8-32 Cap Screw
  • Two 80 TPI Adjusters for ±3° or ±4° of Fine Tip and Tilt Control
  • Platform Can Be Oriented Horizontally or Vertically
  • Designed for Use with Clamping Arms (Sold Below)
  • Removable Knobs Expose Adjuster Screws with Hex Socket
  • #8 (M4) Through Holes in Back Plate of Mounts for Ø1/2" Post Mounting
  • Fabricated from Black Anodized Aluminum

Thorlabs' KM100B(/M) and KM200B(/M) Kinematic Platform Mounts provide kinematic control for prisms and non-standard optics. Each contains several 6-32 (M4) tapped holes for mounting our PM3(/M) or PM4(/M) Clamping Arms (sold below). The KM200B(/M) additionally contains five 1/4"-20 (M6) tapped holes and four #8 (M4) counterbores that provide direct mechanical compatibility with standard optomechanics. The design used in the KM100B(/M) and KM200B(/M) offers an unobstructed path from any direction by positioning the knobs below the mounting plane, as shown in the photo to the right.

The KM100B(/M) is a 1.92" x 1.92" (48.6 mm x 48.6 mm) mount with ±4° of tip and tilt control, while the KM200B(/M) is a 2.90" x 2.90" (73.7 mm x 73.7 mm) mount with ±3° of tip and tilt control. An optional accessory, the LN2580 bronze locking nut, is available to lock the adjusters once the desired position is reached.

If desired, the mounting plate can also be removed and replaced with a user-supplied alternative, enabling custom mounting options. See the blue info icon () in the table below for more information.

Kinematic Platform Mount Specifications
Item # Mounting Platform Adjuster Thread Adjustment per
Revolution
Post Mounting Mechanical Drawing
Dimensions Tapped Holesa Clearance Holes
KM100B 1.92" x 1.92"
(48.6 mm x 48.6 mm)
6-32 (5 Places) N/A 1/4"-80 ±4° #8 Counterbore (3 Places)
KM200B 2.90" x 2.90"
(73.7 mm x 73.7 mm)
6-32 (4 Places) 
1/4"-20 (5 Places)
#8 (4 Places) ±3° #8 Counterbore (7 Places)
KM100B/M 48.6 mm x 48.6 mm 
(1.92" x 1.92")
M4 (5 Places) N/A ±4° M4 Counterbore (3 Places)
KM200B/M 73.7 mm x 73.7 mm
(2.90" x 2.90")
M4 (4 Places)
M6 (5 Places)
M4 (4 Places) ±3° M4 Counterbore (7 Places)
  • 6-32 and M4 Taps Provided to Mount PM3(/M) and PM4(/M) Clamping Arms
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KM100B Support Documentation
KM100B1.92" x 1.92" Kinematic Platform Mount
$58.58
Today
KM200B Support Documentation
KM200B2.90" x 2.90" Kinematic Platform Mount
$100.86
Today
+1 Qty Docs Part Number - Metric Price Available
KM100B/M Support Documentation
KM100B/M48.6 mm x 48.6 mm Kinematic Platform Mount
$58.58
Today
KM200B/M Support Documentation
KM200B/M73.7 mm x 73.7 mm Kinematic Platform Mount
$100.86
Today

Kinematic Prism Mounts


This animation shows how to convert between the right- and left-handed orientations on the KM100PM(/M). The procedure is identical for the KM200PM(/M). The KM05PM(/M) platform does not need to be flipped over, since the platform is symmetrical.

Click to Enlarge

The KM200PM prism mount platform has 6-32 and 8-32 taps and #8 through holes.
  • Two 80 or 100 TPI Adjusters for ±4° of Fine Tip and Tilt Control
  • Platform can be Removed and Secured to Either Arm Enabling Left- or Right-Handed Configuration
  • Designed for Use with Clamping Arms (Sold Below)
  • #8 (M4) Through Holes or Taps in Back Plate of Mounts for Ø1/2" Post Mounting
  • Fabricated from Black Anodized Aluminum

Thorlabs' Kinematic Prism Mounts provide kinematic control for prisms, cube beamsplitters, corner cubes, and other optics that require tip and tilt control. The mounting platforms contain 6-32 (M4) tapped holes for the PM3(/M) and PM4(/M) Clamping Arms sold below; the KM200PM also features 8-32 taps which can be used with the PM5 Stainless Steel Clamping Arm.

The two-piece mounting platform assembly can be configured in either a left- or right-handed orientation, as shown in the animation to the right. The assembly is secured to the front plate of each prism mount using two screws, see the table below for the screw type and required hex. See the mechanical drawings by clicking on the red Docs icon () below for details on each item's assembly. If desired, the mounting plate can also be removed and replaced with a user-supplied alternative, enabling custom mounting options. See the blue info icon () in the table below for more information.

The KM05PM(/M) features 3/16"-100 adjusters that can be actuated using a 5/64" (2.0 mm) ball driver or hex key. The HKTS-5/64 hex key adjuster knobs can also be used. The KM100PM(/M) and KM200PM(/M) both feature 1/4"-80 adjusters with removable knobs. The adjusters can also be actuated using a 5/64" (2.0 mm) ball driver or hex key. An optional accessory, the LN2580 bronze locking nut, is available to lock the adjusters of these two mounts once the desired position is reached.

The KM200PM(/M) platforms can also be used to mount any of our CMOS-Based Shack-Hartmann Wavefront Sensors. The KM200PM(/M) offers #8 (M4) through holes for WFS20 Series sensors, and 8-32 (M4) taps for WFS30 and WFS40 Series sensors. See the table below for details on the array of mounting holes on the platform of each prism mount.

Kinematic Prism Mount Specifications
Item # Mounting Platform Adjuster Thread Adjustment Per
Revolution
Post Mounting Mechanical Drawing
Maximum Deptha Tapped Holesb Clearance Holes
KM05PM 0.70" (17.8 mm) 4-40 (3 Places)
6-32 (5 Places)
N/A 3/16"-100 13 mrad 8-32 Tap (2 Places)
KM100PM 1.00" (25.4 mm) 6-32 (8 Places) N/A 1/4"-80 8 mrad #8 Counterbore (2 Places)
KM200PM 2.10" (53.3 mm) 6-32 (16 Places)
8-32 (4 Places)c
Ø0.19" (2 Places)d 5 mrad #8 Counterbore (6 Places)
KM05PM/M 17.8 mm (0.70") M3 (3 Places)
M4 (5 Places)
N/A 3/16"-100 13 mrad M4 Tap (2 Places)
KM100PM/M 25.4 mm (1.00") M4 (8 Places) N/A 1/4"-80 8 mrad M4 Counterbore (2 Places)
KM200PM/M 53.3 mm (2.10") M4 (21 Places)c Ø4.8 mm (2 Places)d 5 mrad M4 Counterbore (6 Places)
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
KM05PM Support Documentation
KM05PMNEW!Customer Inspired! Kinematic Prism Mount, 0.70" Deep, 4-40 and 6-32 Taps
$100.00
Today
KM100PM Support Documentation
KM100PMKinematic Prism Mount, 1.00" Deep, 6-32 Taps
$77.74
Today
KM200PM Support Documentation
KM200PMKinematic Prism Mount, 2.10" Deep, 6-32 and 8-32 Taps
$123.97
Today
+1 Qty Docs Part Number - Metric Price Available
KM05PM/M Support Documentation
KM05PM/MNEW!Customer Inspired! Kinematic Prism Mount, 17.8 mm Deep, M3 and M4 Taps
$100.00
Today
KM100PM/M Support Documentation
KM100PM/MKinematic Prism Mount, 25.4 mm Deep, M4 Taps
$77.74
Today
KM200PM/M Support Documentation
KM200PM/MKinematic Prism Mount, 53.3 mm Deep, M4 Taps
$123.97
Today

Kinematic Wavefront Sensor Mount


This animation shows how to convert between the right- and left-handed orientations.
Wavefront Sensor Kinematic Mount
Click to Enlarge
 
The KM100WFS Mounted with a WFS20-5C Wavefront Sensor
  • Two 80 TPI Adjusters for ±4° of Fine Tip and Tilt Control
  • Platform can be Removed and Secured to Either Arm Enabling Left- or Right-Handed Configuration
  • Removable Knobs Expose Adjuster Screws with Hex Socket
  • #8 (M4) Through Holes in Back Plate of Mounts for Ø1/2" Post Mounting
  • Fabricated from Black Anodized Aluminum

Thorlabs' KM100WFS Kinematic Platform Mount provides kinematic control for our WFS20 CMOS-Based Shack-Hartmann Wavefront Sensors. The mount features a similar design to our KM100PM (above) with a modified mounting platform designed to accommodate the WFS20 wavefront sensors using the two #8 through holes near the front edge of the plate and the included 8-32 screws. Please note that the optical axis of the sensor will not be centered over the optical post.

The two-piece mounting platform assembly can be configured in either a left- or right-handed orientation. The assembly is secured to the front plate using two 4-40 screws (3/32" hex). The two pieces of the mounting platform assembly are held together with two 3-48 screws [5/64" (2 mm) hex]. This process mimics the one used to switch the handedness of the KM100PM, a video for which is shown above. If desired, the mounting plate can also be removed and replaced with a user-supplied alternative, enabling custom mounting options. See the blue info icon () in the table below for more information.

The KM200PM(/M) Kinematic Prism Mount, available above, can also mount our WFS20 wavefront sensors. The mount platform contains two #8 through holes for High-Speed CMOS-Based Shack-Hartmann Wavefront Sensors, as well as an array of 6-32 (M4) tapped holes for other applications. The platform of the KM200PM(/M) is larger than that of the KM100WFS, yielding a less compact mounted assembly, but with more mounting options for optical components.

Kinematic Wavefront Sensor Mount Specifications
Item # Mounting Platform Adjuster Thread Adjustment Per
Revolution
Post Mounting Mechanical Drawing
Maximum Deptha Tapped Holes Clearance Holes
KM100WFS 1.52" (38.6mm) N/A M3 (2 Places)
#8 (2 Places)b
1/4"-80 8 mrad #8 (M4) Counterbores (2 Places)
  • The Distance between the Front and Back of the Platform at Its Widest Point
  • To Mount WFS20 Series Wavefront Sensors; Two 8-32 Screws Included
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
KM100WFS Support Documentation
KM100WFSKinematic Mount for Thorlabs' Wavefront Sensors
$85.89
Today

Glue-In Kinematic Mounts with Rotation for Small Optics

Kinematic Rotation Mount Features
  • Use for 1 mm Thick Plate or 5 mm Cube Optics
  • ±3° Tip/Tilt Adjustment via Three M2.5 x 0.2 Precision Adjusters
  • 360° Continuous Rotation with ±12° Fine Adjustment
  • Fabricated from Stainless Steel
  • Locking Collars Sold Separately

These kinematic rotation mounts are designed to mount either 5 mm cube optics, such as polarizing or non-polarizing beamsplitter cubes (Item # FBTB), or 1 mm thick plate optics up to 12.7 mm (0.5") wide, such as beamsplitters or mirrors (Item # FBTA) to our Ø1/2" Posts. Both versions require epoxy to mount optical components. The circular rotation plate can be rotated a full 360° and is engraved with a scale marked every 5°. Additionally, a Vernier scale provides 1° resolution for fine rotation.

An engraved dot is present on the FBTA(/M) Plate Optic Mount between the 0° and 90° engravings. Beamsplitter optics should be installed with the beamsplitter coating facing this dot. This allows an incident beam to be aligned so that it is split at the center of the mount.

These mounts allow for tip, tilt, and rotational adjustment for precision beam alignment and steering control. Three vertical screws control the tip/tilt of the mount (see photo to the left), yielding up to ±3° of adjustment. Additionally, these screws can also provide some vertical adjustment when all three screws are rotated by the same amount. Care should be taken to avoid overextending the springs. When the screw above the 'Engage' engraving is tightened, the fine rotation adjustment screw (see photo to the left) gives up to ±12° adjustment with 1.7° per revolution. All adjustment screws use a 0.05" (1.3 mm) hex key, which is included with these mounts.

F10SC1-5 Locking Collars, available separately, can be used to lock an adjuster in a desired position. Simply insert the included hex key through the spanner wrench, and while holding the adjustment screw static, use the spanner wrench to tighten the locking nut (see video above). A hard stop can be created at any position by using two locking collars. Alternatively, a single collar can be epoxied to an adjuster using our G14250 epoxy to create a permanent hard stop.


Click to Enlarge

FBTB Cube Mount with 5 mm Beamsplitter Cube Mounted on a Ø1" Post with 1 mm Spacer

Click to Enlarge

Adjuster Locations on FBTA and FBTB Mounts (FBTA Plate Mount Shown with 12.7 mm x 1 mm Plate Beamsplitter Mounted on a Ø1/2" Post)

Each mount offers a bottom-located 8-32 (M4) tap for post mounting. When mounted on Ø1" Posts with 8-32 (M4) taps, the beam height can be increased using our Ø1" Post Spacers.

We also offer FiberBench-compatible versions of these mounts for mounting optics at the appropriate beam height within a FiberBench system.

Stop Collar Jam Nut
Click to Enlarge

Two Collars Can be Locked Together to Create a Hard Stop
Stop Collar Lock Nut
Click to Enlarge

A Single Locking Collar Can Lock an Adjuster in Position
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
FBTA Support Documentation
FBTAKinematic Rotation Mount for 12.7 mm × 1 mm (W × T) Plate Optics, 8-32 Tap
$327.79
Today
FBTB Support Documentation
FBTBKinematic Rotation Mount for 5 mm Cube Optics, 8-32 Tap
$327.79
Today
+1 Qty Docs Part Number - Universal Price Available
F10SC1-5 Support Documentation
F10SC1-5Locking Collar for M2.5 x 0.20 Adjusters, 5 Pack
$28.11
Today
SPW403 Support Documentation
SPW403Spanner Wrench for FiberPort Zθ Locking Collars and F10SC1-5 M2.5 x 0.20 Locking Collars
$26.27
Today
+1 Qty Docs Part Number - Metric Price Available
FBTA/M Support Documentation
FBTA/MKinematic Rotation Mount for 12.7 mm × 1 mm (W × T) Plate Optics, M4 Tap
$327.79
Today
FBTB/M Support Documentation
FBTB/MKinematic Rotation Mount for 5 mm Cube Optics, M4 Tap
$327.79
Today

Kinematic Pitch Adapter for Fixed Optic Mounts


Click to Enlarge
TPA01 Mounted Vertically on a Ø1/2" Post to Provide Yaw Adjustment
  • Pitch Adapter Gives 1-Axis Adjustment for Fixed Mounts
  • Compatible with All Fixed Mounts with Thickness Between 0.25" to 0.50" (6.4 mm to 12.7 mm)
  • 1/4"-80 Adjuster Provides ±4° Pitch Adjustment
  • Two 8-32 (M4) Tapped Holes Allow for Vertical and Horizontal Post Mounting
  • Fabricated from Black Anodized Aluminum

The TPA01(/M) Pitch-Adjustable Kinematic Adapter holds fixed optic mounts (such as the fixed lens and fixed mirror mounts) with thicknesses between 0.25" to 0.50" (6.4 mm to 12.7 mm) that feature an 8-32 (M4) tap. A lip at the front of the adapter acts as a mechanical guide in order to square the mount to the adapter. The two-piece kinematic design allows the user to actuate one axis of a fixed optic holder, making it ideal for beam-leveling or optic centration applications.

A side-located (when horizontally mounted) 1/4"-80 fine pitch adjuster with a 5/64" (2 mm) hex (compatible with the HKTS-5/64 hex adjuster) is used to articulate the platform through its ±4° adjustment. The mount is equipped with a physical stop (F25SC1) on the pitch adjuster to prevent overextension of the mount. An 8-32 (M4) screw (included with the adapter) secures the fixed optic mount to the top platform through a counterbored slot in the underside of the adapter. The TPA01(/M) has 8-32 (M4) taps on the bottom and side of the adapter to permit horizontal and vertical mounting.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available
TPA01 Support Documentation
TPA01Pitch-Adjustable Kinematic Adapter
$92.03
Today
+1 Qty Docs Part Number - Metric Price Available
TPA01/M Support Documentation
TPA01/MPitch-Adjustable Kinematic Adapter, Metric
$92.03
Today

Clamping Arms


Click for Details

Mechanical Drawings
  • Provide Clamping Force for Our Platform Mounts
  • Threaded Hole on Top and Threaded Stud on Bottom of Post
    • 6-32 Threads on PM3 and PM4
    • 8-32 Threads on PM5
    • M4 Threads on All Metric Versions
  • Maximum Optic Heights from 0.97" to 1.65" (24.6 mm to 41.8 mm)
  • 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

Click to Enlarge

Clamping Arm Extension Posts with Metric Indicator Groove

Thorlabs' Clamping Arms provide clamping force to secure optics to our kinematic platform mounts and V-clamps. The PM3(/M) accommodates optics up to 0.97" tall and features a 0.69" center-to-center distance between the post and the nylon-tipped setscrew that holds the optic. The PM4(/M) accommodates optics up to 1.61" and features a 1.16" 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. Each clamping arm features 6-32 (M4) threads. The PM3 and PM4 can be mounted in 8-32 tapped holes by using the AS6E8E thread adapter, which features internal 6-32 threads and external 8-32 threads. This thread adapter has an outer diameter of 0.24", which is the same as the PM4SP extension post and the post included with the PM4 clamping arm. This allows the clamping arm to be adjusted across the seam between either post and the adapter. The smaller diameters of the included post for the PM3 clamping arm and the PM3SP extension post cause the thread adapter to act as a stop for the clamping arm.

The PM5(/M) clamping arm is made entirely from heat-treated stainless steel, which helps maintain stability in fluctuating temperatures and provides vacuum compatibility. This clamping arm is recommended for use with the POLARIS-K1M4(/M), but it can be used with any platform mount that has one or more 8-32 (M4) tapped holes. The PM5(/M) can hold optics up to 1.65" tall, and the distance from the post center to the contact point that holds the optic is 0.90".

Each clamping arm is attached to its post using a flexure mechanism that locks with a 5/64" (2.0 mm) balldriver or hex key. The setscrew on top of the clamping arm also accepts a 5/64" (2.0 mm) balldriver or hex key in order to clamp down on the optic. The post includes a through hole which can be leveraged 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
$19.33
Today
PM3SP Support Documentation
PM3SPCustomer Inspired! Extension Post for PM3 Clamping Arm, 6-32 Threaded
$5.36
Today
PM4 Support Documentation
PM4Large Adjustable Clamping Arm, 6-32 Threaded Post
$23.64
5-8 Days
PM4SP Support Documentation
PM4SPCustomer Inspired! Extension Post for PM4 Clamping Arm, 6-32 Threaded
$5.36
Today
PM5 Support Documentation
PM5Stainless Steel Adjustable Clamping Arm, 8-32 Threaded Post
$58.71
Today
+1 Qty Docs Part Number - Metric Price Available
PM3/M Support Documentation
PM3/MSmall Adjustable Clamping Arm, M4 Threaded Post
$19.33
Today
PM3SP/M Support Documentation
PM3SP/MCustomer Inspired! Extension Post for PM3/M Clamping Arm, M4 Threaded
$5.36
Today
PM4/M Support Documentation
PM4/MLarge Adjustable Clamping Arm, M4 Threaded Post
$23.64
Today
PM4SP/M Support Documentation
PM4SP/MCustomer Inspired! Extension Post for PM4/M Clamping Arm, M4 Threaded
$5.36
Today
PM5/M Support Documentation
PM5/MStainless Steel Adjustable Clamping Arm, M4 Threaded Post
$58.71
Today
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