Overview
The Ruland PCMR25-10-10-SS is a four beam clamp-style flexible coupling designed for precision motion control and power transmission applications. Machined from a single piece of 303 stainless steel, this coupling delivers zero backlash performance with enhanced torque capacity and corrosion resistance. Its compact footprint (25.4mm OD × 31.8mm length) and flexible beam design make it ideal for applications requiring accommodation of angular, parallel, and axial misalignment while maintaining consistent torque transmission.
Key Features
- Four Beam Spiral Design: Machined from single-piece 303 stainless steel with two sets of two spiral cuts, providing higher torque capacity than single-beam couplings
- Zero Backlash: Rigid one-piece construction ensures repeatable, backlash-free power transmission
- Balanced Design: Optimized weight distribution reduces vibration at high speeds up to 6,000 RPM
- Clamp-Style Mount: M4 metric screws enable quick installation and replacement without moving shafts
- Corrosion Resistant: 303 stainless steel construction for extended service life in demanding environments
- RoHS3 & REACH Compliant: Manufactured under stringent quality controls with US sourced materials
Technical Specifications
- Bore A: 10mm
- Bore B: 10mm
- Outside Diameter (OD): 25.4mm
- Overall Length: 31.8mm
- Material: 303 Stainless Steel
- Style: Four Beam, Clamp Mount
- Fastening: M4 Cap Screw (metric)
- Maximum RPM: 6,000
- Angular Misalignment: 3 degrees maximum
- Parallel Misalignment: 0.38mm maximum
- Axial Motion: 0.25mm maximum
- Nominal Torque: 3.39 Nm
- Torsional Stiffness: 0.103 deg/in-lbs
- Hardware Standard: DIN 912 12.9 metric
- Compliance: RoHS3, REACH
- Country of Origin: USA
Typical Applications
The PCMR25-10-10-SS is widely used in precision automation and motion control systems:
- Servo motor and lead screw assemblies
- Encoder coupling to stepper motors and servo systems
- Robotics and measuring instruments
- Pumps, fans, and valve actuators
- Light to medium duty power transmission requiring compact form factor
- Applications where corrosion resistance or sanitary requirements demand stainless steel
Compatibility & Replacements
Compatible With
- 10mm metric shaft systems and servo motors
- Lead screw assemblies with 10mm diameter bores
- Stepper motor and encoder drive trains
- General motion control systems requiring ±3° angular misalignment accommodation
- Applications operating up to 6,000 RPM without lubrication
Replaces / Drop-In Replacement For
- Ruland PCMR25-10-10-A (aluminum version with identical bore/OD/length)
- Other four beam couplings with 10mm x 10mm bore configuration and 25.4mm OD
- Single-beam couplings where higher torque capacity and lower windup are required
Works With
- Standard 10mm metric shafts and hubs
- No lubrication required; suitable for dry-run and high-speed applications
- Compatible with applications requiring zero backlash feedback accuracy
- Capable of supporting high-speed spindle and encoder applications to 6,000 RPM
