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When your belt-driven system loses tension or skips under load, the culprit is often an undersized or poorly matched idler pulley. Engineers, makers, and machine builders who need reliable T5 belt routing — whether for a CNC router, 3D printer gantry, or industrial conveyor — require an idler pulley that holds its geometry under continuous cycling. This T5 timing idler drive pulley is designed for exactly that application.
Each pulley is machined from aluminum alloy, featuring a toothed profile matched to the T5 belt standard (5mm pitch). The tooth width is a fixed 11mm (0.43 in), accommodating standard 10mm-wide T5 belts with lateral clearance. Tooth counts range from 10T to 60T, with bore diameters spanning 5mm to 24mm (0.20 in to 0.94 in), covering the most common shaft sizes used in motion control assemblies.
Typical use cases include: T5 belt tensioning in CoreXY and Cartesian 3D printer frames; idler routing in CNC plasma and router gantry systems; and belt-driven linear actuators in automated packaging or pick-and-place equipment. The wide tooth-count range allows builders to fine-tune belt wrap angle and drive ratio without sourcing custom parts.
Available in 10T through 60T (10, 12, 14, 15, 16, 17, 18, 19, 20, 22, 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 50, 60 tooth options), giving you precise control over belt wrap angle and drive geometry.
Bore options from 5mm to 24mm (including 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 24mm) to fit the most common shaft sizes in motion control systems.
Tooth profile machined to T5 standard (5mm pitch), ensuring accurate meshing with T5 timing belts and minimizing backlash in positioning applications.
Lightweight yet rigid aluminum alloy body reduces rotational inertia while maintaining dimensional stability across typical operating temperatures in indoor automation environments.
The 11mm tooth width (0.43 in) provides lateral guidance for 10mm-wide T5 belts, reducing belt wander and edge wear during continuous operation.
Suitable as both an idler and a drive pulley in T5 belt systems — use it for tensioning, direction change, or as a driven element in low-to-medium torque applications.
| Belt Standard | T5 (5mm pitch) |
|---|---|
| Tooth Width | 11mm (0.43 in) |
| Compatible Belt Width | 10mm |
| Tooth Count Options | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 36T, 38T, 40T, 50T, 60T |
| Bore Diameter Options | 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 24mm |
| Material | Aluminum alloy |
| Finish | See variant options |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Keyway | See variant options |
| Set Screw | See variant options |
| Weight | See variant options |
The tooth count determines the pulley's pitch diameter and affects belt wrap angle. For idler use, a larger tooth count (e.g., 20T–30T) provides a gentler belt bend radius, reducing belt fatigue. For drive use, match the tooth count to your desired speed ratio. If you are replacing an existing pulley, count the teeth on the original or measure the pitch diameter (PD = tooth count × pitch / π, where T5 pitch = 5mm).
Measure your shaft diameter with a caliper before ordering. Common shaft sizes in 3D printers and CNC machines are 5mm, 6mm, 8mm, and 10mm. For imperial shafts, 6.35mm corresponds to 1/4 inch and 12.7mm to 1/2 inch. The bore must match your shaft diameter exactly — a loose bore will cause runout and belt skip.
Yes. The T5 belt standard is an internationally defined profile (5mm pitch, trapezoidal tooth form). This pulley is machined to T5 profile dimensions and will mesh correctly with any T5-standard timing belt regardless of brand, as long as the belt width is 10mm or narrower.
It can function as both. As an idler, it redirects or tensions the belt without transmitting torque. As a drive pulley, it transmits torque from a shaft to the belt. For drive use, ensure the bore fits your shaft snugly and that a set screw or keyway is used to prevent slipping under load. Check the variant specifications for set screw availability.
Aluminum alloy pulleys are well-suited for the belt tension levels typical in T5 belt systems (generally under 100N per strand for light-duty automation). The material provides a good strength-to-weight ratio and resists deformation under normal operating loads. For very high-tension or heavy industrial applications, verify the specific alloy grade and consult load ratings before use.
The 11mm tooth width provides lateral guidance for 10mm-wide T5 belts. Whether flanges are included depends on the specific variant — please check the product images and variant details. If your application requires positive belt retention (e.g., vertical belt runs), select a flanged variant or add external belt guides to your assembly.
6mm is a metric bore size common in European and Asian motion control components. 6.35mm (1/4 inch) is an imperial bore size used in North American equipment. They are not interchangeable — using the wrong bore will result in a loose fit or inability to mount the pulley. Measure your shaft carefully and select the matching bore.
