Problem this solves
A pulley can look correct by OD and bore, but still fail if the groove profile does not match the belt section. Use this guide to confirm classical and wedge groove geometry before ordering.
Profile matching steps
- 1Read the installed belt marking or measure the belt section if markings are missing.
- 2Confirm whether the system uses classical A/B/C/D or wedge SPZ/SPA/SPB/SPC sections.
- 3Check groove count and pulley width against the number of belts in service.
- 4Verify whether the replacement pulley uses the same standard and datum geometry.
- 5Confirm bore type, taper series, and RPM before finalizing the RFQ.
Classical vs wedge groove reference
| Installed belt family | Pulley groove family | What to verify |
|---|---|---|
| A section | Classical A | Top width and included angle |
| B section | Classical B | Groove geometry and groove spacing |
| SPZ | Wedge SPZ | Datum width and groove depth |
| SPA | Wedge SPA | Pulley series and belt fit |
| SPB / SPC | Wedge SPB / SPC | Groove width, spacing, and OD limits |
Send with your pulley RFQ
- Belt section or marking (A/B/C/D or SPZ/SPA/SPB/SPC)
- Pulley OD and groove count
- Bore type, shaft size, or taper lock series
- RPM and application duty if the drive runs at higher speed
- Photo of the old pulley and belt if profile is unclear
Do not mix classical and wedge profiles by assumption
Similar top widths do not guarantee interchangeability. Confirm the exact section standard before replacing only the pulley or only the belt.