SPA Finished-Bore Pulley is organized as an SPA narrow V-belt pulley configuration for industrial belt-drive enquiries. The public page deliberately separates product-family identity from final engineering release: the pulley profile and groove count identify the family, while the exact diameter, shaft interface, bushing size, hub arrangement and operating duty determine the orderable configuration.
What defines this configuration
The controlling belt family is SPA and the nominal groove arrangement is selected model. The mounting path shown for this listing is a direct finished-bore hub. A pulley that looks similar but belongs to SPZ, SPB or SPC should not be substituted without a drive review because neighboring sections use different groove geometry and different minimum-diameter guidance.
Dimensions and interfaces to confirm
For replacement work, record the existing pulley marking and measure the pulley using the same dimension labels shown on the catalogue or drawing. At minimum, confirm the pitch/datum or outside diameter, groove count, overall face width, shaft diameter, keyway and hub position. If a taper bushing is present, record the bushing designation and bore marking separately from the pulley code.
- SPA belt profile and belt marking
- Groove count and belt quantity
- Pitch/datum diameter or outside diameter, clearly labelled
- Shaft diameter and keyway
- Bushing designation when taper-bushed
- Hub length and axial clearance
- Driver/driven speed and power or torque where available
- Quantity and application environment
Where this family is used
SPA pulley configurations are commonly evaluated for fans, pumps, compressors, conveyors and general industrial machinery. Those application names are context only. They do not determine the groove count or pulley diameter automatically. The drive ratio, transmitted load, shaft speeds, center distance and belt manufacturer guidance remain part of the selection.
Mounting and service access
Taper-bush mounting is useful where the shaft bore is handled through a removable bushing, while pilot or finished bores are appropriate for other machine architectures. The correct path depends on the existing hub, shaft, keyway and service procedure. Installation drawings should also leave room for screw access and future removal where a bushing system is used.
Standards context
ISO 4183:2026 defines the datum-width system for classical and narrow V-belt grooved pulleys and includes SPA among the narrow sections. This page uses that terminology for identification. A project-specific claim of dimensional compliance, balancing grade, material grade or certification is made only when it is supported by the released product specification.
Before ordering
Do not order from groove count alone. Send the model code or drawing when possible. For an unmarked replacement, provide clear photographs, a scale reference and the measured diameters and bore details. If the machine is being redesigned, include the driver/driven speeds, power or torque, center distance, duty cycle and installation envelope so the pulley can be reviewed as part of the belt drive rather than as an isolated wheel.
Prepare the RFQ
Email [email protected] with the pulley code or drawing, belt section, groove count, shaft details, quantity and application.
