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When a slipping or mismatched pulley stalls your conveyor, motor test rig, or DIY power-transmission project, you need a dimensionally accurate drop-in replacement you can trust. These aluminium single-slot belt pulleys are engineered for hobbyists, makers, and small-machine builders who demand consistent torque transfer without the weight penalty of cast iron.
Each pulley is machined from aluminium alloy, delivering a lightweight yet rigid body with a natural resistance to oxidation. Outer diameters span 40 mm (≈1.57 in) to 100 mm (≈3.94 in), and bore diameters range from 8 mm (≈0.31 in) to 30 mm (≈1.18 in), covering the most common shaft sizes used in compact drive systems. The single groove is profiled to the A-type (13 mm top-width) V-belt standard.
Typical applications include small electric motor drives for bench-top lathes and drill presses, conveyor belt tensioning systems in light automation rigs, and custom speed-reduction assemblies in robotics or CNC router builds — all scenarios where an aluminium single-slot A-type belt pulley keeps the build compact and the drive efficient.
| Material | Aluminium alloy |
|---|---|
| Belt Type | A-type (A-section) V-belt |
| Number of Grooves | 1 (single-slot) |
| Outer Diameter (OD) | 40 mm / 50 mm / 60 mm / 80 mm / 100 mm |
| Bore Diameter | 8 / 10 / 12 / 13 / 14 / 15 / 16 / 18 / 20 / 22 / 24 / 25 / 30 mm (see variant options) |
| Groove Profile | A-section (13 mm top width, 40° included angle) |
| Surface Finish | Natural aluminium (machined) |
| Weight | See variant options |
| Quantity per Order | 1 Pcs |
The OD determines your speed ratio. Divide the motor pulley OD by the driven pulley OD to get the reduction ratio. For example, a 40 mm drive pulley paired with an 80 mm driven pulley gives a 2:1 reduction. Select the OD combination that achieves your target output RPM based on your motor speed.
Measure your shaft diameter with a vernier caliper. Choose the bore that matches exactly — a bore that is too large will cause runout and vibration. If your shaft uses a keyway, you will need to have the bore keyway-machined after purchase, as these pulleys are supplied with a plain bore.
Aluminium alloy pulleys are well-suited for light-to-medium duty continuous operation — typical for bench-top machinery, small conveyors, and DIY CNC builds. For heavy shock loads or very high torque (e.g., large industrial compressors), cast-iron or steel pulleys are generally recommended.
Aluminium forms a stable oxide layer that resists rust in typical workshop conditions. For environments with exposure to saltwater, acids, or strong alkalis, consider applying a light coat of protective spray or anodising the pulley surface for extended service life.
Any standard A-section V-belt (13 mm top width, 8 mm height, 40° angle) will seat correctly in the groove. Measure the centre distance between your two pulleys and calculate the required belt length using the standard formula: L ≈ 2C + 1.57(D + d) + (D − d)² / 4C, where C is centre distance and D/d are the two pulley ODs.
Yes. These pulleys are interchangeable between drive and driven positions. Simply select the appropriate OD for each position to achieve your desired speed ratio. Ensure both pulleys are aligned on the same plane to prevent belt tracking issues and premature wear.
These pulleys are supplied with a plain bore. Securing methods include: (1) drilling and tapping a set-screw hole through the hub, (2) having a keyway machined to match your shaft, or (3) using a locking collar alongside the pulley. Choose the method appropriate for your torque level and shaft configuration.
