$54.77 ea
Quantity Price (USD)
1 $54.77 ea
20 $32.86 ea
60 $27.39 ea
100 $24.65 ea
250 Request Quote
In Production Lead Time: 0-2 Days
Ruland FCR10-3-3-A, 3/16" x 3/16" Six Beam Coupling, Aluminum, Clamp Style, 0.625" OD, 1.000" Length


Ruland FCR10-3-3-A is a six beam coupling with 3/16" x 3/16" bores, 0.625" OD, and 1.000" 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. FCR10-3-3-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. FCR10-3-3-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. FCR10-3-3-A is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Large Bore B1

0.188 in

Small Bore B2

0.188 in

B1 Shaft Penetration

0.483 in

B2 Shaft Penetration

0.483 in

Outer Diameter OD

0.625 in

Bore Tolerance

+.001 in / -.000 in

Length L

1.000 in

Clearance Diameter C MAX

0.796 in

Fastening Hardware

Cap Screw


Screw Material

Alloy Steel

Hex Wrench Size

2.0 mm

Screw Finish

Black Oxide

Seating Torque

1.21 Nm

Number of Screws

2 ea

Performance Specifications

Static Torque

13 lb-in

Angular Misalignment

Dynamic Torque Non-Reversing

6.5 lb-in

Parallel Misalignment

0.008 in

Dynamic Torque Reversing

3.25 lb-in

Axial Motion

0.005 in

Torsional Stiffness

0.360 Deg/lb-in

Moment of Inertia

0.0013 lb-in2

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


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.

ISO 9001:2015


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