Continuous Rotation Stage

Fine Pitch Worm Gear Provides 360° Continuous Rotation
Compatible with Prism Mounting Hardware
Vernier Scale Offers 5 arcmin Resolution

CR1

CR1A

General-Purpose Adapter Plate

PM3

PM4

Related Items

Rotation Stage with Crossed-Roller Bearing

Precision Rotation Platform

Rotation Platform Mount

360° Rotation Stage with Hard Stops

K-Cube™ DC Servo Controller

USB Controller Hubs

Please Wait

Overview
Smart Pack
Vernier Scales
Feedback
Rotation Mounts and Stages

Click to Enlarge
An MS1 Translation Stage is Mounted onto an CR1 Rotation Stage through two clearance holes for 4-40 cap screws.

Features

Vernier Scale Offers a Resolution of 5 arcmin
360° Continuous Motion Provided by Fine Pitch Worm Gear
Backlash Free
25 lb Load Capacity with Stage Mounted on a Horizontal Surface
Designed for Mounting MS1 and T12 Series Translation Stages (Using the CR1A Adapter Plate)
Compatible with PM3/PM4/PM5 Prism Mounting Hardware (See Below)

The CR1 rotation stage includes a fine pitch worm gear that provides high precision and backlash-free rotation achieved by the worm gear driven design. Rotation is actuated via a stainless adjuster knob located on the side of the unit. The rotating platform contains an array of 8-32 (M4), 6-32, and 4-40 tapped holes for general mounting requirements. Two radially shaped 1/4" (M6) slots machined in the base provide flexible mounting options and are spaced for compatiblity with imperial and metric optical tables and breadboards.

The easy-to-read radial scale is marked in 2° increments and labeled every 10°. A side-located vernier scale improves resolution to 5 arcmin. The added ability to stack some of our translation stages on the rotation platform, and its 25 lbs capacity, make this stage useful in any laboratory.

Click to Enlarge
CR1 Packaging

Smart Pack

Item #	% Weight Reduction	CO₂-Equivalent Reduction^a
CR1	40.48%	9.07 kg
CR1/M	40.48%	12.25 kg

Smart Pack

Reduce Weight of Packaging Materials
Increase Usage of Recyclable Packing Materials
Improve Packing Integrity
Decrease Shipping Costs

Thorlabs' Smart Pack Initiative is aimed at waste minimization while still maintaining adequate protection for our products. By eliminating any unnecessary packaging, implementing packaging design changes, and utilizing eco-friendly packaging materials for our customers when possible, this initiative seeks to improve the environmental impact of our product packaging. Products listed above are now shipped in re-engineered packaging that minimizes the weight and the use of non-recyclable materials.^b As we move through our product line, we will indicate re-engineered packages with our Smart Pack logo.

Travel-based emissions reduction calculations are estimated based on the total weight reduction of packaging materials used for all of 2013’s product sales, traveling 1,000 miles on an airplane, to provide general understanding of the impact of packaging material reduction. Calculations were made using the EPA’s shipping emissions values for different modes of transport.
Some Smart Pack products may show a negative weight reduction percentage as the substitution of greener packaging materials, such as the Greenwrap, at times slightly increases the weight of the product packaging.

Click to Enlarge
Figure 1: An example of how to read a vernier scale. The red arrow indicates what is known as the pointer. Since the tick mark labeled 10 on the vernier scale aligns with one of the tick marks on the main scale, this vernier scale is reading 75.60 (in whatever units the tool measures).

Reading a Vernier Scale

Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scale on Thorlabs' rotation mounts). A vernier scale has found common use in many precision measurement tools, the most common being calipers and micrometers. The direct vernier scale uses two scales side-by-side: the main scale and the vernier scale. The vernier scale has a slightly smaller spacing between its tick marks (10% smaller than the main). Hence, the lines on the main scale will not line up with all the lines on the vernier scale. Only one line from the vernier scale will match well with one line of the main scale, and that is the trick to reading a vernier scale.

Figures 1 through 3 show a vernier scale system for three different situations. In each case, the scale on the left is the main scale, while the small scale on the right is the vernier scale. When reading a vernier scale, the main scale is used for the gross number, and the vernier scale gives the precision value. In this manner, a standard ruler or micrometer can become a precision tool.

The 0 on the vernier scale is the "pointer" (marked by a red arrow in Figs. 1 - 3) and will indicate the main scale reading. In Figure 1 we see the pointer is lined up directly with the 75.6 line. Notice that the only other vernier scale tick mark that lines up well with the main scale is 10. Since the vernier 0 lines up with the main scale’s 75.6, the reading from Figure 1 is 75.60 (in whatever units the tool measures in).

That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement tool. To expound, let’s look at Figure 2. Here we see that the pointer is no longer aligned with a scale line, instead it is slightly above 75.6, but below 75.7; thus the gross measurement is 75.6. The first vernier line that coincides with a main scale line is the 5, shown with a blue arrow. The vernier scale gives the final digit of precision; since the 5 is aligned to the main scale, the precision measurement for Figure 2 is 75.65.

Since the vernier scale is 10% smaller than the main scale, moving 1/10 of the main scale will align the next vernier marking. This asks the obvious question: what if the measurement is within the 1/10 precision of the vernier scale? Figure 3 shows just this. Again, the pointer line is in between 75.6 and 75.7, yielding the gross measurement of 75.6. If we look closely, we see that the vernier 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier 7 is very slightly above the main scale mark, and we can see that the vernier 8 (directly above 7) is slightly below its corresponding main scale mark. Hence, the scale on Figure 3 could be read as 75.673 ± 0.002. A reading error of about 0.002 would be appropriate for this tool.

As we've seen here, vernier scales add precision to a standard scale measurement. While it takes a bit of getting used to, with a little practice, reading these scales is fairly straightforward. All vernier scales, direct or retrograde, are read in the same fashion.

Click to Enlarge
Figure 2: An Example of a vernier scale. The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.

Click to Enlarge
Figure 3: An Example of a vernier scale. The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.67, but can be accurately read as 75.673 ± 0.002.

Posted Comments:
No Comments Posted

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, piezo inertia 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 Stages^b
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	Micrometer
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 & LM1-B(/M)	CRM1(/M)	CRM1L(/M)	CRM1PT(/M)	KS1RS	K6XS
Click Photo to Enlarge
Features	Optic Carriage Rotates Within Mounting Ring	30 mm Cage-Compatible^a	30 mm Cage-Compatible for Thick Optics^a	30 mm Cage-Compatible with Micrometer^a	±4° Kinematic Tip/Tilt Adjustment Plus Rotation	Six-Axis Kinematic Mount^a
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 & LM2-B(/M)	LCRM2(/M)	KS2RS	K6X2
Click Photo to Enlarge
Features	Standard	Adjustable Zero	Micrometer	Optic Carriage Rotates Within Mounting Ring	60 mm Cage-Compatible	±4° Kinematic Tip/Tilt Adjustment Plus Rotation	Six-Axis Kinematic Mount
Additional Details

Manual Rotation Stages

Manual Rotation Stages
Item #	RP005(/M)	PR005(/M)	MSRP01(/M)	RP01(/M)	RP03(/M)	QRP02(/M)
Click Photo to Enlarge
Features	Standard					Two Hard Stops
Additional Details

Manual Rotation Stages
Item #	XRNR1(/M)	XRR1(/M)	PR01(/M)	CR1(/M)	XYR1(/M)	OCT-XYR1(/M)
Click Photo to Enlarge
Features	Fine Rotation Adjuster and 2" Wide Dovetail Quick Connect	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 mating 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 with Central Clear Apertures
Item #	DDR25(/M)	PDR1(/M)	K10CR1(/M)	PRM1Z8(/M)^a	DDR100(/M)	ELL14	HDR50(/M)
Click Photo to Enlarge
Features	Compatible with SM05 Lens Tubes, 16 mm Cage System, 30 mm Cage System	Compatible with SM05 Lens Tubes, 30 mm Cage System, PD1(/M) and PDX1(/M) Linear Stages	Compatible with SM1 Lens Tubes & 30 mm Cage System		Compatible with SM1 Lens Tubes, 16 mm Cage System, 30 mm Cage System	Compatible with SM1 Lens Tubes, Open Frame Design for OEM Applications	Compatible with SM2 Lens Tubes
Additional Details

Motor Type	Brushless DC Servo	Piezo Inertia Drive	2 Phase Stepper Motor with Worm Gear	DC Servo	Brushless DC Servo	Piezo Resonant Motor	2 Phase Stepper Motor with Worm Gear
Rotation Adjustment Range	360° Continuous
Rotating Platform/Carriage
Diameter	Ø1.14" (Ø29.0 mm)	1.34" (34.0 mm)	Ø1.81" (Ø46.0 mm)	Ø1.97" (Ø50.0 mm)	Ø4.37" (111.0 mm)	-	Ø3.86" (Ø98.0 mm)
Height	1.12" (28.5 mm)	0.71" (18.0 mm)	0.84" (21.5 mm)	0.91" (23.0 mm)	1.57" (39.9 mm)	0.59" (15.1 mm)	1.73" (44.0 mm)
Threaded Mounting Holes	Four 4-40 with 16 mm Spacing	Four 8-32 (M4)	Six 4-40 (M3)	Four 6-32 (M4), Four 8-32 (M4), Four 4-40 with 30 mm Spacing	Eight 8-32 (M4), Four 1/4"-20 (M6), Four 4-40 with 16 mm Spacing, Four 4-40 with 30 mm Spacing	-	Four 8-32 (M4)
Center Aperture	SM05 Internal Threads, 1.2" (28.5 mm) Deep	Ø9.0 mm Clear Aperture with SM05 Internal Threads, 2.5 mm Deep	SM1 Internal Threads, 0.84" (21.5 mm) Deep	SM1 Internal Threads, 0.91" (23.0 mm) Deep	SM1 Internal Threads, 0.82" (21.0 mm) Deep	SM1 Internal Threads, 0.58" (14.7 mm) Deep	Ø50.0 mm Clear Aperture with SM1 Internal Threads, 6.9 mm Deep
Speed (Max)	1800°/s	20°/s	10°/s	25°/s	1080°/s	430°/s	50°/s
Platform Adapter Plate(s)	-	-	K10CR1A2(/M)	PRM1SP1(/M)	NR360SP9(/M) NR360SP4(/M)	-	NR360SP9(/M) NR360SP8 NR360SP4(/M)
Base
Dimensions	2.19" x 2.19" (55.6 mm x 55.6 mm)	1.57" x 1.57" (40.0 mm x 40.0 mm)	4.21" x 2.60" (107.0 mm x 66.0 mm)	5.18" x 3.26" (131.5 mm x 82.8 mm)	4.53" x 4.53" (115 mm x 115 mm)	2.60" x 3.25" (66.0 mm x 82.5 mm)	7.46" x 4.55" (189.4 mm x 115.5 mm)
Stage Adapter Plates	-	-	K10CR1A1 K10CR1A3	PRM1SP2 PRM1SP3	-	-	NR360SP2(/M) NR360SP5(/M)
Bottom Surface Mounting Holes	-	Two 8-32 (M4)	-	Two 1/4" (M6) Counterbores	Four 1/4" (M6) Clearance Holes	-	Four 1/4" (M6) Counterbores
Side Holes for Vertical Mounting	Four 8-32 (M4) Eight 4-40	One 8-32 (M4), Two Sides	Three 8-32 (M4)	Four 8-32 (M4)	Eight 1/4"-20 (M6)	-	Six 1/4"-20 (M6)
Cage System Compatibility	Four 4-40 Holes on Back Side with 16 mm Spacing, Four 4-40 Taps on Front Side with 30 mm Spacing	Ø6 mm Holes for ER Cage Rods with 30 mm Spacing	Four 4-40 Holes on Each Side with 30 mm Spacing	-	Four 4-40 Holes on Back Side with 30 mm Spacing	60 mm Cage using Four 0.12 (3.0 mm) Holes for 4-40 Screws, 30 mm Cage using SR025 Cage Rods to Adapt to ER Cage Rods	-

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.

Motorized Rotation Mounts and Stages with Tapped Platforms
Item #	PRMTZ8(/M)^a	ELL18(/M)^b
Click Photo to Enlarge
Features	Tapped Mounting Platform for Mounting Prisms or Other Optics	Tapped Mounting Platform, Open Frame Design for OEM Applications
Additional Details

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.

Continuous Rotation Mounts

Rotation Stage Adapter

Zoom

Click to Enlarge
A CR1A Adapter is used to secure a T12X Mini Translator onto a CR1 Rotation Stage using two 2-56 (M2) cap screws.

The CR1A adapter can be used to secure select Thorlabs mounts to the CR1 Rotation stage. The adpater is equipped with four 6-32 (M4) taps, one 1/4"-20 (M6) tap, six 4-40 taps (two 4-40 and four M3 on the metric version), eight 2-56 taps (four 2-56 and four M2 on the metric version), and four #6 (M4) clearance holes. The following table lists mounts that may be secured to the the CR1.

The CR1A adapter is attached to the CR1 stage via the #6 (M4) clearance holes with four 6-32 (M4) cap screws (included). The photo to the right shows a T12X translation stage mounted on the CR1A adapter through two #2 (M2) clearance holes in the bottom of the T12X stage.

Mount	Description
PM3(/M), PM4(/M), and PM5(/M)	Clamping Arms
PH Series	Post Holders
T12 Series	1/2" Mini Translators
GN Series*	Small Platform Goniometers*

* Note: The CR1A adapter plate is not compatible with our GNL series Large Platform Goniometers.

Clamping Arms

Zoom

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 x 0.7 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, stages, 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 x 0.7) 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 or stage that has one or more 8-32 (M4 x 0.7) 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	Small Adjustable Clamping Arm, 6-32 Threaded Post

$19.91

Today

PM3SP Customer Inspired! Extension Post for PM3 Clamping Arm, 6-32 Threaded

$5.52

Today

PM4	Large Adjustable Clamping Arm, 6-32 Threaded Post

$24.35

Today

PM4SP Customer Inspired! Extension Post for PM4 Clamping Arm, 6-32 Threaded

$5.52

Today

PM5	Stainless Steel Adjustable Clamping Arm, 8-32 Threaded Post

$60.47

Today

+1 Qty Docs Part Number - Metric Price Available

PM3/M Small Adjustable Clamping Arm, M4 x 0.7 Threaded Post

$19.91

Today

PM3SP/M Customer Inspired! Extension Post for PM3/M Clamping Arm, M4 x 0.7 Threaded

$5.52

Today

PM4/M Large Adjustable Clamping Arm, M4 x 0.7 Threaded Post

$24.35

Lead Time

PM4SP/M Customer Inspired! Extension Post for PM4/M Clamping Arm, M4 x 0.7 Threaded

$5.52

Today

PM5/M Stainless Steel Adjustable Clamping Arm, M4 Threaded Post

$60.47

Today

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous			Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°	Manual, 360° Continuous
Optic Mounting	Internally SM05-Threaded Carriage
Maximum Accepted Optic Thickness	0.23" (5.8 mm)	0.23" (5.8 mm)	0.26" (6.5 mm)	0.23" (5.9 mm)	0.24" (6.0 mm)	0.41" (10.4 mm)	0.29" (7.3 mm)
Post Mounting	4-40 (M3) Stud	8-32 (M4) Tap	None	8-32 (M4) Tap	None	Two Counterbores for 8-32 (M4) Cap Screws	Two Counterbores for 4-40 (M3) Cap Screws
Cage System Compatibility	N/A				Four Bores for ∅4 mm Cage Rods with 16 mm Spacing	N/A	N/A^c

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous					Manual, Continuous: 360°; Discrete: 15°	Manual, Continuous: 360°; Discrete: 22.5°	Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°
Optic Mounting	Internally SM1-Threaded Carriage
Maximum Accepted Optic Thickness	0.47" (11.9 mm)	0.34" (8.6 mm)	0.51" (12.9 mm)	0.25" (6.4 mm)	0.27" (6.8 mm)	0.50" (12.7 mm)	0.50" (12.7 mm)	0.50" (12.7 mm)
Post Mounting	8-32 (M4) Tap	N/A	8-32 (M4) Tap
Cage System Compatibility	N/A							Four 4-40 (M3) Taps on Rotation Dial with 30 mm Spacing

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous			Coarse: Manual, 360° Continuous; Fine: Micrometer, ±7°	Manual, 360° Continuous
Optic Mounting	Internal SM1 Threads in LM1-A	Internally SM1-Threaded Carriage	Double-Bore with Setscrew	Internally SM1-Threaded Carriage
Accepted Optic Thickness	Max: 0.37" (9.4 mm)	Max: 0.37" (9.4 mm)	Min: 0.31" (7.9 mm)	Max: 0.37" (9.4 mm)	Max: 0.47" (11.9 mm)	Max: 0.55" (14 mm)
Post Mounting	8-32 (M4) Tap in LM1-B	8-32 (M4) Tap			Six Counterbores for 8-32 (M4) Cap Screws
Cage System Compatibility	N/A	Four Bores for ∅6 mm Cage Rods with 30 mm Spacing			N/A

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous		Coarse: Manual, 360° Continuous; Fine: ±7° Micrometer	Manual, 360° Continuous
Optic Mounting	Internally SM2-Threaded Carriage			Internal SM2 Threads in LM2-A	Internally SM2-Threaded Carriage
Maximum Accepted Optic Thickness	0.51" (13 mm)	0.54" (13.7 mm)	0.48" (12.2 mm)	0.46" (11.7 mm)	0.51" (13 mm)	0.47" (12 mm)	0.53" (13.4 mm)
Post Mounting	8-32 (M4) Tap			8-32 (M4) Tap in LM2-B	8-32 (M4) Tap	Four Counterbores for 8-32 (M4) Cap Screws	Six Counterbores for 8-32 (M4) Cap Screws
Cage System Compatibility	N/A		Four 4-40 (M3) Taps on Rotation Dial with 60 mm Spacing	N/A	Four Bores for Ø6 mm Cage Rods with 60 mm Spacing	N/A	N/A

Rotation Drive Mechanism and Adjustment Range	Manual, 360° Continuous
Mounting Platform
Diameter	Ø1.00" (Ø25.4 mm)	Ø1.00" (Ø25.4 mm)	Ø1.40" (Ø35.6 mm)	Ø2.07" (Ø52.8 mm)	Ø4.29" (Ø109.0 mm)	Ø2.00" (Ø50.8 mm)
Height	0.67" (17.0 mm)	0.75" (19.1 mm)	0.51" (13.1 mm)	0.63" (16.1 mm)	0.70" (17.8 mm)	1.00" (25.4 mm)
Taps	Six 4-40 (M3) One 1/4"-20 (M6)	One 8-32 (M4) Eight 4-40 (M3)	Four 4-40 (M3) One 8-32 (M4)	Four 8-32 (M4) One 1/4"-20 (M6)	Eight 6-32 (M4) Sixteen 8-32 (M4) Thirteen 1/4"-20 (M6)	Four 6-32 (M4) Four 8-32 (M4) Five 1/4"-20 (M6)
Additional Holes	Two Ø0.13" (Ø3.2 mm) Holes for FiberBench Accessories	-	Four Clearance Holes for 4-40 (M3) Cap Screws	-	-	-
Platform Adapter Plate(s)	-	-	-	-	-	-
Base
Dimensions	1.50" x 1.50" (38.1 x 38.1 mm)	1.50" x 1.50" (38.1 x 38.1 mm)	1.78" x 1.40" (45.2 x 35.6 mm)	2.45" x 2.45" (62.2 x 62.2 mm)	4.65" x 4.65" (118.1 x 118.1 mm)	2.55" x 2.55" (64.8 x 64.8 mm)
Mounting Holes	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 4-40 (M3) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Clearance Holes for 1/4"-20 (M6) Cap Screws	Four Counterbores for 1/4"-20 (M6) Cap Screws
Side Taps for Vertical Mounting	-	-	One 4-40 (M3)	One 8-32 (M4)	Three 8-32 (M4)	-
Cage System Compatibility	N/A

Rotation Drive Mechanism and Adjustment Range	Manual: 360° Continuous; Fine: Adjuster Screw, ±5°	Manual: 360° Continuous; Fine: Adjuster Screw, ±5°	Manual: 360° Continuous; Fine: Micrometer, ±5°	Worm Gear, 360° Continuous	Manual, 360° Continuous with 1/2" (13 mm) Linear Travel Along X and Y Axes with Micrometer
Mounting Platform
Diameter	Ø2.21" (Ø56.0 mm)	Ø3.19" (Ø81.0 mm)	Ø2.70" (Ø68.6 mm)	Ø1.70" (Ø43.2 mm)	Ø4.18" (Ø106.0 mm)	Ø4.04" (Ø102.5 mm)
Height	On Breadboard: 0.91" (23.0 mm)^a Dovetail Stacked: 0.83" (21.0 mm)	On Breadboard: 0.91" (23.0 mm)^a Dovetail Stacked: 0.83" (21.1 mm)	1.00" (25.3 mm)	1.00" (25.4 mm)	1.00" (25.4 mm)	1.65" (41.8 mm)
Taps	Thirteen 1/4"-20 (M6) Four 8-32 (M4) Four 6-32 (M4)	Thirteen 1/4"-20 (M6) Four 8-32 (M4) Four 6-32 (M4)	Four 4-40 (M3) Ten 6-32 (M4) Six 1/4"-20 (M6)	Four 4-40 (M3) Eight 6-32 (M4) Four 8-32 (M4)	Eight 4-40 (M3) Twelve 8-32 (M4) Sixteen 1/4"-20 (M6)	-^b
Additional Holes	-	-	Ø0.94" (Ø23.9 mm) Clear Aperture with SM1 Threading	-	Ø0.90" (Ø22.9 mm) Clear Aperture with SM1 Threading	-^b
Platform Adapter Plate(s)	-	-	PR01A(/M) CRA30(/M)	CR1A(/M)	XYR1A	-^b
Base
Dimensions	3.35" x 2.52" (85.0 mm x 63.9 mm)	4.33" x 3.58" (110.0 mm x 91.0 mm)	2.75" x 3.50" (69.9 x 88.9 mm)	2.76" x 2.10" (70.1 x 53.4 mm)	5.50" x 4.42" (139.7 x 112.3 mm) (Not Including Micrometers)
Mounting Holes	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws	Two Mounting Slots for 1/4"-20 (M6) Cap Screws	Four Mounting Slots for 1/4"-20 (M6) Cap Screws
Side Taps for Vertical Mounting	-	-	Two 1/4"-20 (M6)	-	-
Cage System Compatibility	-	N/A	Four 4-40 Taps on Top Surface for 30 mm Cage System	N/A	Four 4-40 Taps on Top Surface for 30 mm Cage System Four 4-40 Taps on Top Surface for 60 mm Cage System Four 4-40 Taps on Bottom Surface for 60 mm Cage System	-^b