SM1-Compatible Kinematic and Gimbal Mounts

SM1 (1.035"-40) Threading
Mount SM1 Lens Tubes
Mount 1" Circular, Elliptical, or Parabolic Optics

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KCB1C

30 mm Cage Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores

K5X1

5-Axis Kinematic Optic Mount

GMB1

Full Gimbal Mirror Mount for Ø1" Optics

KS1T

Ø1" Kinematic Mount for Optics up to 0.14" (3.5 mm) Thick, 3 Adjusters

K6XS

6-Axis Kinematic Optic Mount

KS1RS

Ø1" Kinematic Rotation Mount

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Overview
Threading Specs
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Features

Fine Adjustment Actuators for Precise Positioning
SM1-Threaded Kinematic and Gimbal Mounts Available
Mount 1" (25.4 mm) Round, Elliptical, or Parabolic Optics
Integrate SM1-Threaded Components such as Lens Tubes, Irises and Adapters

These SM1-threaded (1.035"-40) mounts allow a variety of optical components to be integrated into optomechanical setups. All of these kinematic and gimbal mounts allow for versatility and flexibility in optomechanical constructions due to compatibility with SM1-threaded lens tubes, irises, and adapters. In addition, these mounts (except for the KC45D1 cage assembly mount) all include tapped holes or counterbores for post mounting (see below for details).

Kinematic Mounts offer pitch and yaw movement and precise angular adjustment. Gimbal mounts offer rotational movement without angular or positional crosstalk. The KS1RS and K6XS provide continuous 360° rotational adjustment and ±4° kinematic tip/tilt adjustment, while the KX51 offers tip, tilt, and x, y, z translation. The KC1-T, KCB1, KCB1C, KCB1E, KCB1EC, KCB1P, and the KC45D1 mounts are not only SM1-compatible, but also 30 mm cage system compatible.

This page contains our SM1-Compatible Kinematic and Gimbal Mounts; for a full selection of available kinematic mounts, please visit our Kinematic Mounts and Mirror Mounts navigation menus.

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Threading Specifications

The following is a general overview of screw threading. For more details regarding specifications and dimensions, please consult the Machinery's Handbook, available for purchase at many bookstores.

Features of a Thread
A thread consists of three repeating features: a crest, flank, and root (see drawing to the right). Except in special cases, threads have symmetrical sides inclined at equal angles when a vertical line is drawn through the center of a crest or root. The distance between corresponding points on adjacent threads is known as the pitch of the thread. The flank angle is defined as the angle the flank makes with a perpendicular ray drawn from the screw axis. Unless otherwise stated, threads have a flank angle of 30°, resulting in a total angle between flanks of 60°. Each feature is shown in the diagram to the right.

The major diameter is taken from the crests of a thread while the minor diameter is taken from the roots. For most screws, crests and roots do not terminate at a sharp point, so crest and root truncation values are included in the definitions of major and minor diameter. The pitch diameter is approximately halfway between the major and minor diameters.

Thread Form
A thread form is a set of rules that define the features' scale relative to one another. Common thread forms include the Unified Screw Thread Form, used in the United States of America and measured in imperial units, and the ISO Metric Screw Thread Form, used in many parts of the world and measured with the International System of Units. There are many thread forms in the Unified screw thread standard designated by either UN, which defines a flat root contour, or UNR, which defines a round root contour. These can be further described by appending more letters. For example, an extremely fine thread with a flat root contour is designated UNEF. Those forms which are not standardized by the Unified screw thread system are designated UNS.

Thread Series
Most screws are identified by their thread series. Thread series are denoted by the major diameter and density of threads. Unified threads specify density in threads per inch, while Metric threads specify the thread pitch. For example, in the Unified nomenclature, a 1/4"-20 cap screw has a 1/4" diameter barrel and the pitch is 20 threads per inch (TPI). In metric nomenclature, an M4 x 0.7 cap screw has a 4 mm barrel and the pitch is 1 thread per 0.7 mm. The term M4 x 0.7 is often shortened to just M4.

Unified Thread Class Tolerancing
Location	Loose	Optimal	Strict
Internal	1B	2B	3B
External	1A	2A	3A

Metric Thread Tolerance Positions
Location	Loose	Optimal	Strict
Internal	-	G	H
External	e or f	g	h

Metric Thread Tolerance Grades
Dimension	Location	Tolerance Grades^a
Minor Diameter	Internal	4, 5, 6, 7, 8
Major Diameter	External	4, 6, 8
Pitch Diameter	Internal	4, 5, 6, 7, 8
Pitch Diameter	External	3, 4, 5, 6, 7, 8, 9

The tolerance becomes looser as the grade increases. The underlined grades are used with normal lengths of thread engagement.

Thread Class
The tolerances and allowances on a thread series are given by a thread class. Unified thread classes are alphanumeric identifiers starting with a number from 1 through 3, where 1 is the loosest tolerance and 3 is the tightest, and either A for external threading or B for internal threading.

Metric threads have a slightly more complex tolerancing method that uses tolerancing grades, designated by a number 3 through 9; and tolerancing positions, which use letters e through h. Grades provide a measure of the tolerance itself: the smaller the number, the tighter the tolerance. Positions denote the distance of the tolerance from the pitch diameter. Uppercase positioning letters indicate internal threads while lowercase positioning letters indicate external threads.

Quoting from the Machinery's Handbook, 29th Edition, p. 1885: "To designate the tolerance class, the grade and position of the pitch diameter is shown first followed by that for the major diameter in the case of the external thread or that for the minor diameter in the case of the internal thread, thus 4g6g for an external thread and 5H6H for an internal thread. If the two grades and positions are identical, it is not necessary to repeat the symbols, thus 4g, alone, stands for 4g4g and 5H, alone, stands for 5H5H."

Thorlabs' SM Series Threads
Threading specifications for our SM threads, utilized in our lens tube and cage system components, are given below so that you can machine mating components to suit your application. Most SM series threads utilize a non-standard Unified thread form, indicated by the letters UNS, with a 30° flank angle and a thread class of 2A and 2B. The exception is our SM30 series thread, which is a Metric thread form with a 30° flank angle and a tolerance of 6H/6g. We also offer products with C-Mount and RMS threads, and the specifications for these threads are given below for reference. Please note that other manufacturers may have different tolerances for C-Mount and RMS 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, M30.5 x 0.5 – 6H/6g		Internal Thread, M30.5 x 0.5 – 6H/6g
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" Lens Tubes
External Thread, 4.035"-40 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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Ø1" Kinematic Mount with SM1 Threads

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Both images above show the F280APC-B fiber collimator mounted in the KM100T kinematic mount using an AD11F adapter. On the left, the KM100T is mounted upwards using the #8 (M4) counterbore accessed by a through hole in the front plate. On the right, the KM100T is mounted with one of two back-located #8 (M4) counterbores, which are orthogonal to the optic mounting bore and to each other.

SM1-Threaded Mount for Ø1" Optics up to 0.14" (3.5 mm) Thick
Optics Held with Retaining Rings
Angular Range: ±4°
Resolution: 8 mrad (0.5°) per Rev via Two 1/4"-80 Precision Adjusters
Three Counterbored #8 (M4) Through Holes Allow for Left-Handed, Right-Handed, or Upward-Facing Orientation
Removable Knobs Expose Hex Sockets in the Adjuster Screws
Ø1" Lens Tube Compatible via SM1 Threading

The KM100T SM1-Threaded Kinematic Mirror Mount is designed for use with thin Ø1" optics up to 0.14" (3.5 mm) thick. An optic is secured in the mounting hole with the two included SM1RR SM1 (1.035"-40) threaded retaining rings, which can be attached using the SPW602 spanner wrench. This mount is also compatible with SM1-threaded components, including our Ø1" Lens Tubes.

The universal KM100T is compatible with both imperial and metric threaded Ø1/2" mounting posts via #8 (M4) counterbored through holes, and can be attached to the post in a right-handed, left-handed, or upward-facing orientation, as shown in the photos to the right. The mount has removable knobs that expose hex sockets in the lead adjuster screws. The KM100T features two 1/4"-80 adjusters for tip and tilt adjustments. An optional accessory, the LN2580 bronze locking nut, is available to lock the adjusters once the desired position is reached.

Thin Kinematic Mounts are also suitable for mounting fiber collimators utilizing adapters such as the AD11F, as shown above.

Ø1" Kinematic Mount for Optics up to 0.14" (3.5 mm) Thick, 3 Adjusters

Ø1in Kinematic Mount for Optics up to 0.14in (3.5 mm) Thick, 3 Adjusters

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AD11F Adapter Threaded into the KS1T for Mounting a Laser Diode Module

Internally SM1-Threaded (1.035"-40) for Ø1" Lens Tube Compatibility
Mounts Thin Ø1" Optics up to 0.14" (3.6 mm) Thick via Included Retaining Rings
Two Counterbored #8 (M4) Through Holes Allow for Left-Handed or Right-Handed Orientation
Angular Range: ±4°
Three lockable 1/4"-80 Precision Adjusters Provide 8 mrad (0.5°) of Travel per Revolution
Removable Knobs Expose Hex Sockets in the Adjuster Screws

The KS1T mirror mount uses a retaining ring for stress-free mounting of a thin optical component. An optic is secured in the mounting hole with the two included SM1RR SM1 (1.035"-40) threaded retaining rings, which can be attached using the SPW606 spanner wrench. This threading also allows the mount to be compatible with Ø1" lens tubes. This mount incorporates a thicker back plate than our two adjuster mirror mount, sold above, thereby providing increased stability. In addition to the increased mass of the mount, stiffer springs and hardened inserts at all contact points have been utilized to enhance the overall performance.

The KS1T is universal, making it compatible with both imperial and metric threaded Ø1/2" mounting posts via a #8 (M4) counterbored through hole, and can be attached to the post in a right-handed or left-handed orientation. The mount has removable knobs that expose hex sockets in the lead adjuster screws. The KS1T features three 1/4"-80 TPI, lockable adjusters that allow the ±4° adjustment range to be altered by translating the front plate of the mirror mount. 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, a maximum Z translation of 0.25" (6.4 mm) can be achieved.

As shown in the image above and to the right, the internal threads can also be used to mount externally threaded adapters, allowing for various components to be mounted such as laser diode modules or fiber collimators.

Ø1" Kinematic Rotation Mount

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Combines Kinematic Angular Adjustment with Rotation in One Mount
Three 1/4"-80 Lockable Stainless Steel Adjusters with Removable Knobs and Brass Bushings for Smooth Adjustments
Six #8 (M4) Counterbored Mounting Holes Allow Left-Handed or Right-Handed Orientations
Engraved Rotation Scale with 2° Graduations Provides 360° Rotation
SM1-Threaded (1.035"-40) Rotation Ring with Locking Screw

The KS1RS is designed to hold Ø1" (25.4 mm) optics in situations where it is necessary to control the tip/tilt position as well as the rotation of the optic. This mount is ideal for polarization optics such as linear polarizers or wave plates. In addition, our Ø1" round cylindrical lenses may also be mounted in the KS1RS when it is necessary to adjust the angle of the line produced at the focal plane. The KS1RS features an SM1-threaded bore capable of mounting Ø1" optics up to 0.47" (11.9 mm) thick using the included SM1RR retaining ring. Additionally, SM1 lens tubes may be threaded onto the mount to accommodate thicker optics.

Thorlabs' Kinematic Rotation Mounts combine the features of our Precision Kinematic Mirror Mounts and Manual Rotation Mounts, providing continuous 360° rotational adjustment and ±4° kinematic tip/tilt adjustment. These mounts are therefore ideal for holding optics with rotational asymmetry, such as polarization optics or round cylindrical lenses.

The rotation of the mount may be locked in position with a locking screw. The locking screw is activated using a 5/64" (2 mm) hex key. The kinematic adjustment is provided by three 1/4"-80 adjusters with brass bushings to provide smooth adjustment. Each adjuster may be locked with a locking screw using a 5/64" (2 mm) hex key.

Please note that while this mount is designed to hold Ø1" optics, the mount uses the same form factor as the KS2 Ø2" mirror mount in order to incorporate the rotation ring.

If higher adjustment resolution or control is desired, the 1/4"-80 adjusters used in these mounts can be switched with DAS110 or DM22 Differential Adjusters.

5-Axis Kinematic Optic Mount

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K5X1 Kinematic Mount Shown with a Ø1" Lens Tube and a Ø1/2" Post

Five Axes of Lockable Adjustment
- Pitch/Yaw: ±4° at 8 mrad/rev
- X and Y Translation: ±0.04" (±1.0 mm) at 254.0 µm/rev
- Z Translation^a: ±0.13" (±3.2 mm)
SM1-Threaded (1.035"-40) Bore for Ø1" (Ø25 mm) Optics up to 0.38" (9.5 mm) Thick
Two #8 (M4) Counterbores for Post Mounting
Compact Size: 2.54" x 2.54" x 2.10" (64.4 mm x 64.4 mm x 53.3 mm)

The K5X1 5-Axis Kinematic Optic Mount offers an optic cell that can be adjusted along 5 axes (pitch, yaw, and XYZ), each with a locking screw for stability. The translating cell has SM1 threading (1.035"-40) for attaching Ø1" mounted optics. The cell can also be used to mount Ø1" (Ø25 mm) unmounted optics up to 0.38" (9.5 mm) thick using the included SM1RR Retaining Ring, which can be tightened using an SPW602 or SPW606 Spanner Wrench (sold separately). The mount features engraved vertical and horizontal tick marks to use as an alignment aid for the mounting cell. For post mounting the K5X1 kinematic mount in a right- or left-handed configuration, two orthogonal #8 (M4) counterbores are provided. For information on the hex key sizes needed to adjust and lock the kinematic mount, please click on the Docs icon () below and select a drawing format.

For adjustment on all of the axes available with the K5X1 plus rotational adjustment, we offer the K6XS 6-Axis Kinematic Mount (sold below).

Z-axis translation is accomplished by turning all three tip/tilt adjusters equally in the same direction.

6-Axis Kinematic Optic Mount

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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 Translation^a: ±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.

30 mm Kinematic Cage Mount

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±4º Angular Rotation, ±3 mm Linear Translation
Compatible with 30 mm Cage System
Minimum Optic Thickness: 0.04" (1 mm)
Maximum Optic Thickness: 0.23" (5.8 mm)
Post-Mountable With a #8-32 (M4) Tapped Hole

The KC1-T offers three adjusters with independently locking setscrews. The rugged mechanical design provides excellent stability when mounted in a cage system or on a post.

Both the front and rear plates have been machined with four clearance holes designed for direct compatibility with our 30 mm cage system standards. The rear plate provides locking setscrews to clamp to cage rods for secure positioning. The cage rod holes in the front plate are sufficiently oversized to allow ±4º tip and tilt without interference with the rods. The KC1-T has an SM1 (1.035"-40) center tap for mounting optics and is compatible with our SM1-Series Lens Tubes and related accessories. Two SM1RR Retaining Rings are included with the KC1-T and can be used to mount a Ø1" optic up to 5.5 mm thick. Thicker optics can be mounted by using an SM1-series lens tube.

30 mm Cage Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes

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View Imperial Product List

Item #	Qty	Description
CCM1-PBS25-1064-HP	1	30 mm Cage-Cube-Mounted, High-Power, Polarizing Beamsplitter Cube, 1064 nm, 8-32 Tap
C128CC	2	Adapter Clamp for Ø1.27" Cylindrical Objects
SC600	1	SM1 Anodized Aluminum Lens Tube Cover, 2' (609.6 mm) Long
KCB1	1	Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes, 30 mm Cage System and SM1 Compatible, 8-32 and 1/4"-20 Mounting Holes
BB1-E03	1	Ø1" Broadband Dielectric Mirror, 750 - 1100 nm
ER2-P4	1	Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
SC1K	1	Aluminum Dust Cover Tool Kit

View Metric Product List

Item #	Qty	Description
CCM1-PBS25-1064-HP/M	1	30 mm Cage-Cube-Mounted, High-Power, Polarizing Beamsplitter Cube, 1064 nm, M4 Tap
C128CC	2	Adapter Clamp for Ø1.27" Cylindrical Objects
SC600	1	SM1 Anodized Aluminum Lens Tube Cover, 2' (609.6 mm) Long
KCB1/M	1	Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes, 30 mm Cage System and SM1 Compatible, M4 and M6 Mounting Holes
BB1-E03	1	Ø1" Broadband Dielectric Mirror, 750 - 1100 nm
ER2-P4	1	Cage Assembly Rod, 2" Long, Ø6 mm, 4 Pack
SC1K	1	Aluminum Dust Cover Tool Kit

A KCB1 and high power beamsplitter cube with a beam path enclosed by an aluminum lens tube cover and two C128CC clamps.

Eight 4-40 Tapped Holes to Mate with 30 mm Cage Systems
Mounts Ø1" (25.4 mm) Optics at a 45° Angle to the Optical Axis
Provides ±4º Kinematic Tip and Tilt Adjustment
Compatible with SM1-Threaded (1.035"-40) Lens Tubes
Post Mountable:
- KCB1: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
- KCB1/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø1" Posts)

The KCB1(/M) cube provides kinematic tip and tilt of an optic held in a mounting plate whose mean horizontal position is at a 45° angle. Entrance and exit ports are equipped with an SM1-threaded (1.035"-40) bore. The KCB1(/M) has eight 4-40 tapped holes center-to-center spaced to mate with our 30 mm cage system standard. ERSCB ER Rod Adapters are necessary to effectively connect, adjust, and lock two of these right angle cage mounts together within the cage system. The kinematic tip and tilt adjustment plate on these cubes is actuated with 100 TPI (Threads per Inch) adjustment screws that allow for smooth, high-resolution movement of 0.01" (0.254 mm) per rotation. Two of these adjusters include removable knobs, while the third must be tuned with a 5/64" (2 mm) hex key or balldriver.

A nylon-tipped setscrew is used to secure Ø1" (25.4 mm) optics using a 5/64" (2 mm) hex key or balldriver via the mounts' rear-loading, double-bored hole. The rear loading design does not limit the maximum thickness of the mounted optic and the mounted optic remains accessible even after the mount is fitted with cage rods or lens tubes. The minimum thickness for optics that can be secured by these mounts is 0.12" (3 mm), and optics thinner than 0.12" (3 mm) will need to be combined with an optic spacer.

30 mm Cage Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores

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Beamsplitter Cube Attached to KCB1 Turning Mirror

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View Imperial Product List

Item #	Qty	Description
Imperial Product List
BA2	2	Mounting Base, 2" x 3" x 3/8"
PH2	2	Ø1/2" Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L = 2"
TR4	2	Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 4"
KCB1	1	Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes, 30 mm Cage System and SM1 Compatible, 8-32 and 1/4"-20 Mounting Holes
KCB1C	1	Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores, 30 mm Cage System and SM1 Compatible, 8-32 and 1/4"-20 Mounting Holes
ER1.5-P4	1	Cage Assembly Rod, 1.5" Long, Ø6 mm, 4 Pack
ER4-P4	2	Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
SH25S038	1	1/4"-20 Stainless Steel Cap Screw, 3/8" Long, 25 Pack
W25S050	1	1/4" Washer, M6 Compatible, Stainless Steel, 100 Pack

View Metric Product List

Item #	Qty	Description
Metric Product List
BA2/M	2	Mounting Base, 50 mm x 75 mm x 10 mm
PH50/M	2	Ø12.7 mm Post Holder, Spring-Loaded Hex-Locking Thumbscrew, L=50 mm
TR100/M	2	Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 100 mm
KCB1/M	1	Right-Angle Kinematic Mirror Mount with Tapped Cage Rod Holes, 30 mm Cage System and SM1 Compatible, M4 and M6 Mounting Holes
KCB1C/M	1	Right-Angle Kinematic Mirror Mount with Smooth Cage Rod Bores, 30 mm Cage System and SM1 Compatible, M4 and M6 Mounting Holes
ER1.5-P4	1	Cage Assembly Rod, 1.5" Long, Ø6 mm, 4 Pack
ER4-P4	2	Cage Assembly Rod, 4" Long, Ø6 mm, 4 Pack
SH6MS12	1	M6 x 1.0 Stainless Steel Cap Screw, 12 mm Long, 25 Pack
W25S050	1	1/4" Washer, M6 Compatible, Stainless Steel, 100 Pack

KCB1C Mount with Smooth Bores (Right) Directly Attached to a KCB1 Mount with Tapped Holes (Left)

Eight 0.25" (6.35 mm) Deep Smooth Bore Holes to Mate with 30 mm Cage Systems
Mounts Ø1" (25.4 mm) Optics at a 45° Angle to the Optical Axis
Provides ±4º Kinematic Tip and Tilt Adjustment
Compatible with SM1-Threaded (1.035"-40) Lens Tubes
Post Mountable:
- KCB1C: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
- KCB1C/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø1" Posts)

The KCB1C(/M) cube provides kinematic tip and tilt of an optic held in a mounting plate whose mean horizontal position is at a 45° angle. Entrance and exit ports are equipped with an SM1-threaded (1.035"-40) bore and four 0.25" (6.35 mm) deep smooth bore holes center-to-center spaced to mate with our 30 mm cage system standard. The cage rods are secured by eight setscrews using a 5/64" (2 mm) hex key or balldriver. This design allows multiple 30 mm cage components to be directly interfaced without the need for ERSCB ER Rod Adapters. The kinematic tip and tilt adjustment plate on these cubes is actuated with removable 100 TPI (Threads per Inch) adjustment screws that allow for smooth, high-resolution movement of 0.01" (0.254 mm) per rotation. Two of these adjusters include removable knobs, while the third must be tuned with a 5/64" (2 mm) hex key or balldriver.

A nylon-tipped setscrew is used to secure Ø1" (25.4 mm) optics using a 5/64" (2 mm) hex key or balldriver via the mounts' rear-loading, double-bored hole. This hole features a clearance cut that provides a maximum clear aperture for any transmitted light and allows easy access to mounted optics. The rear loading design does not limit the thickness of the mounted optic and the mounted optic remains accessible even after the mount is fitted with cage rods or lens tubes. The minimum thickness for optics that can be secured by these mounts is 0.12" (3 mm), and optics thinner than 0.12" (3 mm) will need to be combined with an optic spacer.

30 mm Cage Right-Angle Kinematic Elliptical Mirror Mount with Tapped Cage Rod Holes

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KCB1E Elliptical Mount on a Post with ER Cage Rods and an SM1 Lens Tube

Mounts 1" (25.4 mm) Elliptical Optics at a 45° Angle to the Optical Axis
Eight 4-40 Tapped Holes for ER Cage Rods
Provides ±4° Kinematic Pitch and Yaw Adjustment
Z-Axis Translation Using All Three Adjusters: ±0.12" (±3.0 mm)
30 mm Cage System and SM1 (1.035"-40) Compatible
Post Mountable:
- KCB1E: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
- KCB1E/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø25.0 mm Posts)

The KCB1E(/M) right-angle mount provides pitch and yaw adjustment for a 1" (25.4 mm) elliptical optic held in a mounting plate whose nominal horizontal position is at a 45° angle. The ports are equipped with SM1-threaded (1.035"-40) bores and four 4-40 tapped holes center-to-center spaced to mate with our 30 mm Cage System standard. The kinematic pitch and yaw adjustment plate is actuated with 100 TPI (Threads per Inch) adjustment screws that provide angular resolution of 7.6 mrad/rev. Two of these adjusters include removable knobs, while the third must be tuned with a 5/64" (2 mm) hex key or balldriver. While the optic face is nominally centered within the mount, the third adjuster can be used for fine tuning the position along the optical axis.

A nylon-tipped adjustment screw and a nylon-coated spring clip are used to secure 1" (25.4 mm) elliptical optics using a 0.05" (1.3 mm) hex key or balldriver via the mount's rear-loading, double-bored hole. The rear loading design ensures that the optic remains accessible even after the mount is fitted with cage rods or lens tubes. These mounts were designed for a 6 mm thick optic. We offer dielectric and metallic elliptical mirrors, which are compatible with these mounts.

30 mm Cage Right-Angle Kinematic Elliptical Mirror Mount with Smooth Cage Rod Bores

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KCB1EC(/M) Mounts have Smooth Bores for Cage Rods

Mounts 1" (25.4 mm) Elliptical Optics at a 45° Angle to the Optical Axis
Eight 0.25" (6.35 mm) Deep Smooth Bore Holes for ER Cage Rods
Provides ±4° Kinematic Pitch and Yaw Adjustment
Z-Axis Translation Using All Three Adjusters: ±0.12" (±3.0 mm)
30 mm Cage System and SM1 (1.035"-40) Compatible
Post Mountable:
- KCB1EC: One 8-32 Tap and One 1/4"-20 Tap (for Ø1/2" and Ø1" Posts)
- KCB1EC/M: One M4 Tap and One M6 Tap (for Ø1/2" and Ø25.0 mm Posts)

The KCB1EC(/M) right-angle mount provides pitch and yaw adjustment for a 1" (25.4 mm) elliptical optic held in a mounting plate whose nominal horizontal position is at a 45° angle. The ports are equipped with SM1-threaded (1.035"-40) bores and four 0.25" (6.35 mm) deep smooth bore holes spaced to mate with our 30 mm cage system standard. The cage rods are secured by eight setscrews using a 5/64" (2 mm) hex key or balldriver. This design allows multiple 30 mm cage components to be directly interfaced without the need for ERSCB ER Rod Adapters. The kinematic pitch and yaw adjustment plate is actuated with 100 TPI (Threads Per Inch) adjustment screws that provide angular resolution of 7.6 mrad/rev. Two of these adjusters include removable knobs, while the third must be tuned with a 5/64" (2 mm) hex key or balldriver. While the optic face is nominally centered within the mount, the third adjuster can be used for fine tuning the position along the optical axis.

A nylon-coated spring clip is used to secure 1" (25.4 mm) elliptical optics using a 0.05" (1.3 mm) hex key or balldriver via the mount's rear-loading, double-bored hole. The rear loading design ensures that the optic remains accessible even after the mount is fitted with cage rods or lens tubes. These mounts were designed to hold a 6 mm thick elliptical optic. We offer dielectric and metallic elliptical mirrors, which are compatible with these mounts.

30 mm Cage Right-Angle Kinematic Off-Axis Parabolic Mirror Mount with Smooth Cage Rod Bores

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Beam Path Inside KCB1P Mount
(OAP Mirror Sold Separately)

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KCB1P Mounting Plate and Housing Body Shown with
Off-Axis Parabolic Mirror (Sold Separately)

Mounts Ø1" (Ø25.4 mm) Off-Axis Parabolic Mirrors at a Right Angle
Eight 0.25" (6.35 mm) Deep Smooth Bore Holes for Ø6 mm ER Cage Rods
Provides ±4° Kinematic Pitch and Yaw Adjustment
Z-Axis Translation Using All Three Adjusters: ±0.12" (±3.0 mm)
30 mm Cage System and SM1 Lens Tube Compatible
Two 1/4"-20 (M6) Taps for Mounting on Ø1/2" or Ø1" Posts

The KCB1P(/M) right-angle mount provides pitch and yaw adjustment for a Ø1" (Ø25.4 mm) off-axis parabolic (OAP) mirror mounted on a plate that positions the surface of the mirror at a 45° angle. The ports are equipped with SM1-threaded (1.035"-40) bores and four 0.25" (6.35 mm) deep smooth bore holes spaced to mate with our 30 mm cage system. The cage rods are secured by eight setscrews using a 5/64" (2.0 mm) hex key or balldriver. This design allows multiple 30 mm cage components to be directly interfaced without the need for ERSCB ER Rod Adapters. The kinematic pitch and yaw adjustment plate is actuated with 100 TPI (Threads Per Inch) adjustment screws that provide an angular resolution of 7.6 mrad/rev. The knob on each adjuster is removable. While the optic face is nominally centered within the mount, the third adjuster can be used for fine tuning the position along the optical axis.

Three captive 4-40 cap screws in the optic mounting plate are used to secure the Ø1" (Ø25.4 mm) off-axis parabolic mirror using a 5/64" (2.0 mm) hex key or balldriver. The rear-loading, removable mounting plate features our ball and V-groove design that allows it to be precisely kinematically positioned on the body of the mount. The plate and mount are held together using pairs of rare-earth magnets. Once mounted, the plate can be firmly secured in place using the captive locking screw with 5/64" (2.0 mm) hex on the back. The rear-loading design ensures that the optic remains accessible even after the mount is fitted with cage rods or lens tubes. The back of the mounting plate offers an engraved label for marking details about the installed mirror such as the focal length or part number. The mounting plate also features through bores for OAP mirrors with holes for the focused or collimated beams, though we do not currently stock these mirrors in a Ø1" form factor. To request a quote for custom Ø1" OAP mirrors with holes, please contact Tech Support.

Ø1" Gimbal Mirror Mount for the 30 mm Cage System

Ø1in Gimbal Mirror Mount for the 30 mm Cage System

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View Imperial Product List

Item #	Qty	Description
ER6-P4	1	Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
ER2	2	Cage Assembly Rod, 2" Long, Ø6 mm
C2A	1	Swivel Coupler, 4 Pack
CP08	2	SM1-Threaded 30 mm Cage Plate with Flexure Clamping, 1 Retaining Ring, 8-32 Tap
CP33	1	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
KC45D1	1	Ø1" Gimbal Mirror Mount, 30 mm Cage Compatible, One Retaining Ring Included

View Metric Product List

Item #	Qty	Description
ER6-P4	1	Cage Assembly Rod, 6" Long, Ø6 mm, 4 Pack
ER2	2	Cage Assembly Rod, 2" Long, Ø6 mm
C2A	1	Swivel Coupler, 4 Pack
CP08/M	2	SM1-Threaded 30 mm Cage Plate with Flexure Clamping, 1 Retaining Ring, M4 Tap
CP33/M	1	SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
KC45D1	1	Ø1" Gimbal Mirror Mount, 30 mm Cage Compatible, One Retaining Ring Included

Gimbal mounts in combination with our swivel couplers are ideal for creating non-45° incident angles within a cage system.

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The KC45D1 Gimbal Mount in a 30 mm Cage System

True Gimbal Design
Maximum Optic Thickness: 0.24" (6 mm)
Mounts Ø1" Optics
Compatible with Thorlabs' 30 mm Cage System
Full 360° Rotation of Optic Holder
±30° Rotation on the Optic Holder Saddle

The KC45D1 Gimbal Mirror Mount is designed to allow a Ø1" optic to be rotated about a point in the center of a 30 mm cage assembly with true gimbal motion. The optic holder is free to rotate through 360°. Once its coarse angular orientation is set, the fine adjustment mechanism (i.e., two 100 TPI adjusters offering an adjustment per revolution of 13 mrad/rev) can be used for precise alignment, using the HKTS-5/64 hex key thumbscrew or any other 5/64" hex key or balldriver. The second angular degree of freedom is achieved by rotation of an intermediate saddle. This saddle connects the optic holder to the cage assembly and is free to rotate ±30°. The optic is secured against the back lip of the SM1 (1.035"-40) center tapped region using the included SM1RR Retaining Ring.

Gimbal Mount

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Designed for Intra-Cavity Use
Maximum Optic Thickness: 0.63" (16 mm)
Angular Range: ±2.5°
Angular Displacement per Revolution: 0.35°
Post Mountable with Three 8-32 (M4) Tapped Holes

The GM100 gimbal mount for Ø1" optics is designed for intra-cavity use. 50 divisions per revolution graduated adjustment knobs are located on the top surface of the mount, making them easily accessible even if the mount is integrated into an optical cavity. This design provides pure rotational motion without angular or positional crosstalk.

Full Gimbal Mirror Mount for Ø1" Optics

Full Gimbal Mirror Mount for Ø1in Optics

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True Gimbal Design
Maximum Optic Thickness: 0.25" (6.4 mm)
Mounts Ø1" (25.4 mm) Optics
Fine Adjustment Provides ±15° at 1°/rev
Fully Lockable Design
Superior Kinematic Performance Without Crosstalk

The GMB1 Gimbal Mirror Mount, which is designed to hold Ø1" (Ø25.4 mm) optics up to 0.25" (6.4 mm) thick, features true gimbal motion in order to eliminate crosstalk when steering a beam of light. The point of rotation for both axes is located at the center of the mounted optic’s surface. Utilizing locking thumbscrews and fine pitch adjusters, the GMB1 offers both coarse adjustment and fine tuning. The coarse adjustment allows 360° of manual positioning for both angular degrees of freedom. The fine adjustment allows for ±15° of control, with rotation of the control knob yielding 1° of angular displacement per revolution. The yaw can be adjusted in a similar fashion using the thumbscrew and setscrew closest to the post. After the desired pitch and yaw position is established, the entire mount can be easily locked into place by tightening both thumbscrews and both setscrews. The minimal profile of this mount is ideal for tight beam paths.