EP-SPA 112-03 V-Belt Pulley is an exact SPA three-belt configuration with P 112 mm, O 117.5 mm, bush 2012 and a listed maximum bore of 50 mm. This is a compact-diameter choice in the SPA family, so tight machine envelopes and higher shaft speed sensitivity.
At this compact-diameter size, the ratio calculation should use P rather than O. O remains important for the guard and nearby structure, while the three-belt face means a balanced middle ground between axial width and multi-belt capacity. Check the row-specific E/F/J/K/L/M/N dimensions if an existing hub, shoulder or guard sits close to the pulley.
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 | 3 |
| Pitch / datum diameter P | 112 mm |
| Outside diameter O | 117.5 mm |
| Construction type | 8 |
| Taper bush | 2012 |
| Maximum bore | 50 mm |
Where this model enters a drive decision
In application discussions this geometry is most relevant to pump and compressor drives where continuous duty and alignment matter. The wider SPA use context also includes agricultural machinery, compressors and pumps, industrial fans, woodworking and textile equipment; however, the suitability of this exact model depends on power, speed, wrap, duty cycle and shaft loading rather than industry name alone.
Installation and replacement checks
Before fitting the taper bush, clean the shaft and mating taper, inspect the key arrangement and tighten the bush screws progressively. After seating, verify face alignment and belt tracking before final tensioning.
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 three-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.
