Problem this solves
Correct coupling selection avoids vibration and premature wear. Use these checks to choose the right type and size.
Selection steps
- 1Identify coupling type: jaw, grid, flexible, or rigid.
- 2Record shaft diameters and keyways for both sides.
- 3Calculate torque from power and RPM.
- 4Check misalignment limits (angular and parallel).
- 5Select service factor and size accordingly.
- 6Confirm spacer length or hub distance.
Coupling selection criteria
Torque, RPM, shaft fit, and misalignment limits are the core criteria used to size a coupling correctly.
Coupling selection matrix
| Requirement | Best fit | Notes |
|---|---|---|
| Shock loads | Grid | Handles impact and torque spikes |
| Misalignment | Flexible/jaw | Absorbs minor offsets |
| Precision alignment | Rigid | Low backlash, needs alignment |
| Quick element change | Jaw | Replace elastomer spider fast |
| High torque | Grid or gear | Confirm rating and balance |
Include When Confirming Specifications
- Shaft sizes and keyways for both ends
- Torque and RPM
- Misalignment details
- Preferred coupling type if any
- Photos of existing hubs or elements