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Engineers and makers who rely on synchronous belt drives know the frustration of pulleys that slip, wobble, or fail to seat cleanly on a shaft. These T5 15mm timing belt smooth-tooth drive pulleys are designed for hobbyists, robotics builders, CNC machine assemblers, and small-machine designers who need a dimensionally consistent, drop-in pulley that mates reliably with standard T5 pitch belts.
Each pulley is machined from aluminum alloy with a smooth trapezoidal T5 tooth profile (5mm pitch). The belt-engaging face is 15mm wide (approximately 0.59 in), and the stepped hub provides a positive shoulder for axial location on the shaft. Available tooth counts span 20T, 22T, 24T, 25T, and 30T, with bore diameters from 5mm to 20mm (approximately 0.20–0.79 in), including a 6.35mm (1/4 in) imperial option. Keyway variants (3mm, 4mm, 5mm, 6mm) are available for torque-critical applications.
Typical use cases include open-loop stepper-driven linear actuators for desktop CNC routers, belt-driven axis systems in 3D printers and laser engravers, and light-duty conveyor or indexing mechanisms in automated fixtures — all applications where T5 timing belt pulleys with stepped bore and optional keyway deliver repeatable positioning without slippage.
| Belt Profile | T5 (trapezoidal, 5mm pitch) |
|---|---|
| Belt Width | 15mm (approx. 0.59 in) |
| Number of Teeth | 20T / 22T / 24T / 25T / 30T |
| Bore Diameter | 5, 6, 6.35, 8, 10, 12, 12.7, 14, 15, 16, 17, 18, 19, 20 mm |
| Keyway Width | Without keyway / 3mm / 4mm / 5mm / 6mm |
| Hub Style | Stepped hub (w Step) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Pitch Diameter (20T) | Approx. 31.8mm (1.25 in) |
| Pitch Diameter (30T) | Approx. 47.7mm (1.88 in) |
| Weight | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with your mating pulley, sets the drive ratio. A 20T pulley paired with a 40T pulley gives a 2:1 reduction. Smaller tooth counts (20T–22T) suit higher-speed, lower-torque outputs; larger counts (25T–30T) increase pitch diameter and are better for higher-torque or lower-speed drives. Calculate your required ratio first, then select the tooth count that fits your shaft spacing and belt length.
For light-duty, unidirectional loads where the pulley is secured with a set screw, a plain bore (without keyway) is typically adequate. If your application involves reversing loads, high torque, or vibration, a keyway provides positive rotational locking and prevents the pulley from spinning on the shaft. Match the keyway width to your shaft's existing keyway slot — common options here are 3mm, 4mm, 5mm, and 6mm.
The stepped hub creates a shoulder that the pulley rests against axially on the shaft. This eliminates the need for a separate spacer or collar to position the pulley along the shaft axis, simplifying assembly and improving alignment. It is particularly useful in compact drive systems where axial space is limited.
This pulley is designed for 15mm-wide T5 timing belts. While the T5 tooth pitch (5mm) is the same across all T5 belt widths, using a narrower belt on a 15mm pulley reduces load capacity and may cause belt tracking issues. A wider belt will overhang the pulley face. For best results, match the belt width to the pulley face width — use a 15mm T5 belt with this pulley.
These pulleys are machined from aluminum alloy, which offers a favorable strength-to-weight ratio and natural oxide layer corrosion resistance suitable for indoor and dry environments. For applications involving moisture, mild chemicals, or outdoor exposure, consider applying a light coating of corrosion-inhibiting lubricant or selecting a stainless steel alternative if your environment demands it.
Measure your shaft diameter with a digital caliper to the nearest 0.1mm. Select the bore that matches your shaft exactly — a bore that is too large will cause runout and vibration; one that is too small will not fit. For imperial shafts, the 6.35mm (1/4 in) and 12.7mm (1/2 in) bore options are provided. If your shaft uses a keyway, also measure the keyway width and depth to select the correct keyway variant.
Yes. T5 timing belt pulleys with stepped bore are commonly used in desktop CNC routers, laser engravers, and custom 3D printer axis systems where T5 belt drives are specified. Verify that your machine's belt pitch is T5 (5mm), belt width is 15mm, and that the bore matches your motor or drive shaft diameter. The 20T and 25T variants are particularly common in these applications.
