Precision Couplings
Understand the difference between diaphragm, jaw, cross-slider and beam couplings, and master torque calculation and selection method.
Follow these three factors in order and you rarely go wrong:
Check your motor peak torque first, then pick a coupling rated at least 30% above it. Torque ≈ 9550 × power (kW) ÷ speed (rpm).
Match both the motor shaft and driven shaft diameters. We support custom bores from 3 to 78 mm plus keyways.
Check shaft alignment — well-aligned shafts suit single diaphragm, some misalignment suits long diaphragm or jaw.
| Type | Features | Applications | Backlash |
|---|---|---|---|
| Diaphragm coupling | Metal diaphragm, zero backlash, high rigidity, maintenance-free | Servo motors, CNC, robotics | Zero |
| Jaw coupling | TPU elastomer, vibration damping, replaceable, low cost | General automation, packaging, conveying | Zero |
| Cross-slider coupling | Center slider compensates large misalignment | Large misalignment, low speed | Small |
| Beam coupling | Helical slot, high flexibility, compact | Encoders, low torque light duty | Zero |
A key value of couplings is compensating misalignment between shafts. Misalignment comes in three types: angular, parallel (radial) and axial. Single diaphragm suits well-aligned shafts; long diaphragm and jaw compensate larger angular and parallel misalignment.
Rated torque T = 9550 × P / n, where P is power (kW) and n is speed (rpm). The coupling's rated torque should be ≥ 1.3 × motor peak torque.