$184.50 ea
Quantity Price (USD)
1 $184.50 ea
10 $138.38 ea
25 $103.32 ea
50 $62.04 ea
100 Request Quote
In Production Lead Time: 0-2 Days
Ruland PSMR25-10-9-SS, 10mm x 9mm Four Beam Coupling, Stainless Steel, Set Screw Style, 25.4mm OD, 31.8mm Length


Ruland PSMR25-10-9-SS is a four beam coupling with 10mm x 9mm bores, 25.4mm OD, and 31.8mm 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. PSMR25-10-9-SS 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. PSMR25-10-9-SS is made from 303 stainless steel for increased torque capacity. It is machined from bar stock that is sourced exclusively from North American mills and is RoHS2 and REACH compliant. PSMR25-10-9-SS is manufactured in our Marlborough, MA factory under strict controls using proprietary processes.



Large Bore B1

10 mm

Small Bore B2

9 mm

B1 Shaft Penetration

14.7 mm

B2 Shaft Penetration

14.7 mm

Outer Diameter OD

25.4 mm

Bore Tolerance

+.025 mm / -.000 mm

Length L

31.8 mm

Fastening Hardware

Forged Set Screw


Screw Material

Alloy Steel

Hex Wrench Size

2.0 mm

Screw Finish

Black Oxide

Seating Torque

1.76 Nm

Number of Screws

4 ea

Performance Specifications

Static Torque

4.63 Nm

Angular Misalignment

Dynamic Torque Non-Reversing

2.31 Nm

Parallel Misalignment

0.38 mm

Dynamic Torque Reversing

1.15 Nm

Axial Motion

0.25 mm

Torsional Stiffness

0.91 Deg/Nm

Moment of Inertia

9.275 x10-6 kg-m2

Maximum Speed

6,000 RPM

Additional Information

Material Specification

Type 303 Austenitic, Non-Magnetic Bar


-40°F to 350°F
-40°C to 176°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 chemicals including Ethylene Thiourea and Nickel (metallic), known to the State of California to cause cancer, and Ethylene Thiourea known to the State of California to cause birth defects or other reproductive harm. For more information go to

ISO 9001:2015


Conflict Minerals






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