$65.10 ea
Quantity Price (USD)
1 $65.10 ea
10 $39.06 ea
25 $32.55 ea
50 $29.30 ea
100 Request Quote
In Production Lead Time: 0-2 Days
Ruland PCR16-6-6-A, 3/8" x 3/8" Four Beam Coupling, Aluminum, Clamp Style, 1.000" OD, 1.250" Length


Ruland PCR16-6-6-A is a four beam coupling with 3/8" x 3/8" bores, 1.000" OD, and 1.250" length. It is machined from a single piece of material and feature two sets of two spiral cuts. This gives it higher torque capacity, lower windup, and larger body sizes than single beam couplings. PCR16-6-6-A is well suited for applications such as encoders that require high positioning accuracy. This four beam spiral coupling is zero-backlash and has a balanced design for reduced vibration at high speeds of up to 6,000 RPM. All hardware is metric and tests beyond DIN 912 12.9 standards for maximum torque capabilities. PCR16-6-6-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 is RoHS2 and REACH compliant. PCR16-6-6-A is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Large Bore B1

0.375 in

Small Bore B2

0.375 in

B1 Shaft Penetration

0.579 in

B2 Shaft Penetration

0.579 in

Outer Diameter OD

1.000 in

Bore Tolerance

+.001 in / -.000 in

Length L

1.250 in

Fastening Hardware

Cap Screw


Screw Material

Alloy Steel

Hex Wrench Size

3.0 mm

Screw Finish

Black Oxide

Seating Torque

4.6 Nm

Number of Screws

2 ea

Performance Specifications

Static Torque

30 lb-in

Angular Misalignment

Dynamic Torque Non-Reversing

15 lb-in

Parallel Misalignment

0.015 in

Dynamic Torque Reversing

7.5 lb-in

Axial Motion

0.010 in

Torsional Stiffness

0.200 Deg/lb-in

Moment of Inertia

0.0116 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



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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