Precision Couplings
A side-by-side look at the two most common servo coupling types, so you pick the right one.
A diaphragm coupling transmits torque through a 304 stainless steel diaphragm — a metal flexure that compensates misalignment while staying zero-backlash, rigid and maintenance-free. A jaw coupling sandwiches a TPU polyurethane spider between two aluminum hubs; the elastomer damps vibration and can be replaced on its own.
| Item | Diaphragm Coupling | Jaw Coupling |
|---|---|---|
| Principle | 304 stainless diaphragm flexure | TPU elastomer in compression |
| Backlash | Zero | Zero |
| Stiffness | High (up to 135,000 N·m/rad) | Medium |
| Damping | Weak | Strong (elastomer absorbs) |
| Maintenance | Maintenance-free | Replaceable spider |
| Torque range | 1–1040 N·m | 0.2–520 N·m |
| Cost | Higher | Lower |
| Typical use | Servo, CNC, robotics | General automation, packaging, conveyors |
Choose a diaphragm coupling when you need maximum rigidity and zero backlash — servo motors, CNC, robotics, semiconductor. Choose a jaw coupling when you need vibration damping, shock protection, or a replaceable elastomer for lower maintenance — general automation, packaging, conveyors, pumps.
A side-by-side look at the two most common servo coupling types, so you pick the right one.
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