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When a slipping or misaligned pulley brings your CNC router, 3D printer, or automation rig to a halt, the fix starts with the right T5 timing pulley. Engineers, makers, and DIY builders who need repeatable, backlash-free linear motion rely on T5-AF timing pulleys to keep their drives locked in sync.
Each T5 timing pulley in this series is machined from aluminum alloy (AF grade) and features a T5 tooth profile — a 5mm pitch designed for 10mm wide T5 belts. Available in tooth counts from 10T to 20T and bore diameters from 5mm to 20mm (including 6.35mm / 1/4" and 12.7mm / 1/2" imperial sizes), with optional keyway widths of 3mm, 4mm, 5mm, or 6mm for positive shaft locking. Sold individually (1 pc) or in pairs (2 pcs).
T5 timing pulleys are a go-to component for CNC axis drives, 3D printer extruder and motion systems, robotic arm joints, conveyor indexing mechanisms, and any application where a T5 belt drive must maintain precise positional accuracy over thousands of cycles.
| Tooth Profile | T5 (5mm pitch) |
|---|---|
| Belt Width | 10mm |
| Number of Teeth | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T |
| 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, or 6mm (see variant options) |
| Material | Aluminum alloy (AF grade) |
| Quantity per Order | 1 pc or 2 pcs (see variant options) |
| Flange | See variant options |
| Hub Outer Diameter | See variant options |
| Overall Height | See variant options |
The tooth count determines the pulley's pitch diameter and, combined with your belt length and center distance, sets your drive ratio. Fewer teeth (e.g., 10T–12T) give a smaller diameter and are suited for compact drives or higher reduction ratios when paired with a larger driven pulley. More teeth (e.g., 18T–20T) spread belt load across more contact points, which is beneficial at higher speeds. For most desktop CNC and 3D printer motion systems, 16T–20T is a common starting point.
Measure your motor or drive shaft diameter with calipers before ordering. Common NEMA 17 stepper shafts are 5mm; NEMA 23 shafts are typically 6.35mm (1/4") or 8mm. If your shaft is imperial, look for the 6.35mm (1/4") or 12.7mm (1/2") bore options in this listing. Always confirm the bore is equal to or slightly larger than your shaft — a bore that is too small cannot be installed without machining.
A keyway is recommended whenever the pulley must transmit significant torque, operate under reversing loads, or maintain precise angular positioning. Without a keyway, the pulley relies solely on a set screw against the shaft, which can slip under sustained load. Match the keyway width to the standard key size for your shaft diameter: 3mm keys are typical for 8–10mm shafts, 4mm for 10–12mm shafts, 5mm for 14–16mm shafts, and 6mm for 18–20mm shafts. Consult a standard key chart if in doubt.
This pulley is designed and flanged specifically for 10mm wide T5 timing belts. Using a narrower belt (e.g., 6mm) may result in the belt riding off-center or losing flange guidance. A wider belt will not seat correctly between the flanges. For other belt widths, a pulley matched to that width is required.
Aluminum alloy pulleys are significantly lighter than steel equivalents, which reduces rotational inertia and allows faster acceleration and deceleration — a key advantage in CNC and 3D printing applications where rapid direction changes are common. The trade-off is lower surface hardness compared to steel, so aluminum pulleys are best suited for moderate-load, moderate-speed applications rather than heavy industrial drives with abrasive belts.
Yes, provided the replacement pulley matches the original in tooth count, bore diameter, keyway specification (if any), and overall hub dimensions. Measure the existing pulley's tooth count, bore, and hub length before ordering. If the hub length differs significantly, belt alignment may be affected. Contact us to confirm compatibility if you are unsure.
The quantity option controls how many pulleys are included in a single order line. Selecting "1 pc" ships one pulley; selecting "2 pcs" ships two identical pulleys at a discounted per-unit price. Two-piece orders are convenient when equipping both the drive and driven shafts of a belt loop, or when keeping a spare on hand for a running machine.
