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Ruland FCMR32-14-8-A, 14mm x 8mm Six Beam Coupling, Aluminum, Clamp Style, 31.8mm OD, 44.5mm Length


Ruland FCMR32-14-8-A is a six beam coupling with 14mm x 8mm bores, 31.8mm OD, and 44.5mm length. It is machined from a single piece of material and features two sets of three spiral cuts. This gives it higher torque capacity, lower windup, and larger body sizes than single or four beam couplings and allows for use in light duty power transmission applications such as coupling a servo motor to a lead screw. FCMR32-14-8-A is zero-backlash and has a balanced design for reduced vibration at high speeds of up to 6,000 RPM. Ruland supplies this spiral coupling with Nypatch® anti-vibration hardware that allows for even seating of the screw, repeated screw installations, prevents galling, and maintains high holding power. All hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. FCMR32-14-8-A is made from 7075 aluminum for lightweight and low inertia. It is machined from bar stock that is sourced exclusively from North American mills and RoHS2 and REACH compliant. FCMR32-14-8-A is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Large Bore B1

14 mm

Small Bore B2

8 mm

B1 Shaft Penetration

21.4 mm

B2 Shaft Penetration

21.4 mm

Outer Diameter OD

31.8 mm

Bore Tolerance

+.025 mm / -.000 mm

Length L

44.5 mm

Clearance Diameter C MAX

37.06 mm

Fastening Hardware

Cap Screw


Screw Material

Alloy Steel with Nypatch®

Hex Wrench Size

4.0 mm

Screw Finish

Black Oxide

Seating Torque

9.5 Nm

Number of Screws

2 ea

Performance Specifications

Static Torque

5.08 Nm

Angular Misalignment

Dynamic Torque Non-Reversing

2.54 Nm

Parallel Misalignment

0.38 mm

Dynamic Torque Reversing

1.27 Nm

Axial Motion

0.25 mm

Torsional Stiffness

0.71 Deg/Nm

Moment of Inertia

11.885 x10-6 kg-m2

Maximum Speed

6,000 RPM

Additional Information

Material Specification

7075-T651 Extruded and Drawn Aluminum Bar


-40°F to 225°F
-40°C to 107°C

Finish Specification



Ruland Manufacturing

Country of Origin


Weight (lbs.)




Product Notes

Note 1

Torque ratings are at maximum misalignment.

Note 2

Performance ratings are for guidance only. The user must determine suitability for a particular application.

Note 3

Torque ratings for the couplings are based on the physical limitations/failure point of the machined beams. Under normal/typical conditions the hubs are capable of holding up to the rated torque of the machined beams. In some cases, especially when the smallest standard bores are used or where shafts are undersized, slippage on the shaft is possible below the rated torque of the machined beams. Please consult technical support for more assistance.

Prop 65

WARNING This product can expose you to the chemical Ethylene Thiourea, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

ISO 9001:2015


Conflict Minerals






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