When an existing machine calls for SPA and 4 grooves, EP-SPA 315-04 V-Belt Pulley is identified by more than its outside diameter. Its working row records P 315 mm, O 320.5 mm, bush 3020 and maximum bore 75 mm together with the construction dimensions used to check the hub envelope.
For a replacement, photograph the old marking before removal and measure the shaft with the bush identified separately from the pulley. Then compare the theoretical ratio from P, physical clearance from O and the face/hub dimensions in the table below. That sequence is more reliable than matching by visual diameter.
Engineering data for this configuration
The table is generated from the model metadata imported with this product, keeping the exact P/O, type, bush, maximum bore and construction dimensions together.
| Parameter | Value |
|---|---|
| Profile | SPA |
| Grooves | 4 |
| Pitch / datum diameter P | 315 mm |
| Outside diameter O | 320.5 mm |
| Construction type | 6 |
| Taper bush | 3020 |
| Maximum bore | 75 mm |
Where this model enters a drive decision
For agricultural machinery, compressors and pumps, industrial fans, woodworking and textile equipment, maintenance access can be as important as nominal diameter. A taper-bush mounting can simplify removal where the shaft interface is compatible, but the exact bush, key and axial envelope still need confirmation for this large-diameter model.
Installation and replacement checks
Do not correct pulley misalignment by over-tensioning the belts. Seat the bush correctly, align the pulley faces, confirm the guard clearance and then apply the belt supplier’s tensioning method.
Measure the shaft
Record shaft diameter and key arrangement before ordering the bush/bore combination.
Check ratio and clearance
Use P for ratio; use O and the face/hub dimensions for physical space.
Align the drive
Seat the pulley correctly before belt tension is applied and check both pulley faces.
Buyer questions for SPA four-belt pulleys
What should I quote for this exact model?
Use the EP- model above and include shaft diameter, quantity, application, driver speed and driven speed. Add a photo or drawing for replacement work.
Should I calculate with outside diameter?
Use the pitch/datum diameter for the theoretical pulley speed ratio. Outside diameter is mainly a physical-envelope check.
Can the bore be enlarged beyond the listed maximum?
Treat the listed maximum bore as the limit for this catalogue configuration. If the shaft is larger, select a different model/bush arrangement or request an engineering review.
Send the machine interface with the model
Email [email protected] with this EP- designation, shaft diameter, speeds, quantity and any old-pulley reference.
