Overview
The Omega ES4-R spacer element is a flexible elastomeric coupling manufactured by Rexnord for industrial power transmission applications. This compact, cost-effective solution provides torque transmission while accommodating shaft misalignment and dampening vibration. The split-in-half design allows maintenance without hub or equipment disturbance, making it ideal for pumps, motors, compressors, and general machinery.
Key Features
- Split-in-half flex element design — enables quick disassembly and replacement without removing hubs or connected equipment
- Spacer configuration — provides additional hub spacing for applications requiring separated shafts
- Misalignment accommodation — compensates for angular, parallel, and axial misalignment
- Vibration damping — elastomeric material reduces noise and shock loads
- Chemical resistance — standard urethane material resists petroleum products and most industrial chemicals
- Multiple material options — available in Standard (Orange), Heavy Duty Yellow (HDY), and Hydrolytically Stable Green (HSU)
Technical Specifications
- Coupling Size: ES4-R (Size 4)
- Maximum Torque (Continuous): 550 lb-in
- Maximum Speed: 6600 RPM
- Maximum Bore: 1.19 inches (30 mm metric)
- Outer Diameter: 4.56 inches
- Width (A Dimension): 5.56 inches
- Element Width: 2.60 inches
- Weight: 3.10 lbs
- Material: Urethane elastomer (Standard Orange); HDY and HSU options available
- Hub Type Compatibility: Straight bore hubs, QD (Quick Disconnect), Taper-Lock
Typical Applications
- Centrifugal and positive displacement pumps
- Electric motor-driven equipment
- Air and gas compressors
- Fans and blowers
- Conveyors and material handling systems
- Gearbox input/output shafts
- General industrial machinery requiring misalignment tolerance
Compatibility & Replacements
Compatible With
- Rexnord Omega straight bore hubs
- Rexnord QD (Quick Disconnect) hubs
- Rexnord Taper-Lock bushings (compression bushed)
- ANSI spacer coupling standards
- DIN and ISO spacer coupling applications
Replaces / Drop-In Replacement For
- Rexnord part number 7300085 (standard urethane)
- Rexnord part number 10287348 (alternative reference)
- Original equipment manufacturers (OEM) ES4-R specification applications
Works With
- All Rexnord Omega spacer coupling hub styles
- Sleeve Extension (SE) kits for extended spacing applications
- Matched assembly options for higher speed applications
- SHRB, HQD, and HTL hub configurations
