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When a slipping or mismatched pulley causes your CNC router, 3D printer, or robotic axis to lose steps, the entire project stalls. Engineers, makers, and automation builders who need repeatable, backlash-free linear motion rely on correctly specified 3M HTD timing belt drive pulleys to keep every cycle on track.
These 3M HTD drive pulleys are CNC-machined from aluminium alloy and designed for 3mm-pitch HTD timing belts with a maximum belt width of 10mm (3/8 inch). Available in three flange types — AF (flanged both sides), BF (single flange), and K (no flange) — with tooth counts from 15 to 50 and bore sizes from 4mm to 20mm (approx. 5/32 inch to 25/32 inch). Each pulley ships individually (1 pc per order).
Typical applications include desktop 3D printer X/Y axes, DIY CNC routing machines requiring a 3M HTD drive pulley replacement, lightweight robotic arm joints, and compact conveyor or indexing systems where a low-profile aluminium timing pulley keeps moving mass to a minimum.
| Belt Pitch | 3mm (HTD 3M) |
|---|---|
| Max. Belt Width | 10mm (3/8 inch) |
| Tooth Count Options | 15 / 20 / 25 / 30 / 40 / 50 Tooth |
| Bore Size Options | 4 / 5 / 6 / 7 / 8 / 10 / 12 / 14 / 15 / 16 / 17 / 18 / 19 / 20mm |
| Flange Type | AF (double flange) / BF (single flange) / K (keyway) |
| Material | Aluminium alloy |
| Quantity per Order | 1 pc |
| Outside Diameter | See variant options |
| Hub Length | See variant options |
| Set Screw | See variant options |
The tooth count determines the pulley's pitch diameter and, combined with your motor's RPM, sets the linear speed of your belt. A smaller tooth count (e.g., 15T) gives a smaller diameter and higher belt speed per revolution, while a larger count (e.g., 50T) increases torque multiplication. Match the tooth count to your drive ratio requirements and verify that the resulting pitch diameter fits within your machine's frame clearance.
Type AF has flanges on both sides of the tooth face, which keeps the belt centred automatically — ideal for open-loop systems or where belt tracking is critical. Type BF has a flange on one side only, useful when space on one side is restricted. Type K has no flanges but includes a keyway slot in the bore, providing a positive mechanical lock to the shaft under higher torque loads where a set screw alone may not be sufficient.
Measure your motor or drive shaft diameter with a vernier caliper. Select the bore size that matches exactly — these pulleys are machined to close tolerances and are not intended to be bored out further. If your shaft is between two listed sizes, contact us before ordering to confirm the best fit or whether a bushing solution is appropriate.
No. These pulleys are specifically designed for the HTD 3M tooth profile, which has a rounded, curvilinear tooth form. GT2 belts use a different tooth geometry and will not mesh correctly with HTD pulleys. MXL belts use a trapezoidal profile and are also incompatible. Always match the pulley tooth profile to your belt specification.
Aluminium alloy has natural oxidation resistance suitable for most indoor automation, 3D printing, and light industrial environments. In high-humidity or chemically aggressive settings, consider applying a light coating of dry lubricant to the tooth face. For outdoor or washdown environments, contact us to discuss whether an anodised or alternative material option is available.
Yes. NEMA 17 motors typically have a 5mm shaft, so the 5mm bore variant is the standard choice. NEMA 23 motors commonly use an 8mm or 1/4-inch shaft — select the 8mm bore accordingly. Always verify your specific motor's datasheet for the exact shaft diameter before ordering, as some manufacturers deviate from the nominal size.
Each order includes 1 pulley (1 pc) as listed in the variant options. If you need multiple pulleys for a multi-axis machine or a paired drive/idler setup, simply adjust the quantity at checkout or place separate orders for different bore or tooth count combinations.
