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When a slipping or mismatched pulley is costing you downtime on your CNC router, 3D printer, or conveyor build, you need a drop-in replacement that holds tolerance under load. These 5M BF-type timing belt pulleys are designed for makers, engineers, and machine builders who demand dimensional accuracy and repeatable performance across every cycle.
Each pulley is machined from aluminum alloy with a natural or anodized finish. The tooth profile conforms to the 5M HTD standard (5 mm pitch). Tooth width is 16 mm (0.63 in). Available tooth counts run from 14 T to 20 T, with bore diameters from 5 mm to 20 mm (0.20 in – 0.79 in). Optional keyway widths of 3 mm, 4 mm, or 5 mm are available on select bore/tooth combinations. Flanges are integrated on both sides to keep the belt tracking true.
Typical use cases include 5M HTD belt drive systems on desktop CNC machines, laser engravers, and automated conveyor lines; motor-to-shaft coupling on stepper and servo motor assemblies; and replacement pulleys for 3D printer extruder or axis drive trains requiring a 5M pitch pulley with a custom bore.
5 mm pitch curvilinear tooth geometry for smooth, low-noise engagement with 5M HTD belts — reduced backlash versus trapezoidal profiles.
Bore diameters from 5 mm to 20 mm (0.20"–0.79") cover most stepper, servo, and DC motor shaft sizes without custom machining.
Select variants include a 3 mm, 4 mm, or 5 mm keyway slot for positive torque transmission — eliminates set-screw-only reliance under high-cycle loads.
Integrated flanges on both sides of the tooth face keep the belt centered and prevent lateral walk during operation.
Seven tooth-count options let you dial in your drive ratio precisely. Pair with a matching 5M pulley on the driven shaft for the ratio you need.
Order 1 pc or 2 pcs per variant to match your project quantity — no need to buy in bulk when you only need one replacement.
| Belt Pitch | 5M (5 mm HTD) |
|---|---|
| Tooth Count | 14 T, 15 T, 16 T, 17 T, 18 T, 19 T, 20 T |
| Tooth Width | 16 mm (0.63 in) |
| Bore Diameter | 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 / 16 / 17 / 18 / 19 / 20 mm |
| Keyway Width | Without keyway / 3 mm / 4 mm / 5 mm (see variant options) |
| Flange | Dual flange (both sides) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Hub Style | BF-type (flanged hub) |
| Quantity per Order | 1 pc or 2 pcs (see variant options) |
| Compatible Belt | 5M HTD timing belt, 16 mm width |
The tooth count determines your drive ratio. Divide the driven pulley's tooth count by the driving pulley's tooth count to get the ratio. For example, a 20 T driving pulley paired with a 40 T driven pulley gives a 2:1 reduction. Choose a tooth count that achieves your target speed or torque ratio when paired with your other pulley.
Measure your motor or drive shaft diameter with a caliper. Select the bore that matches exactly — for example, a 6.35 mm bore fits a standard 1/4" (0.250") shaft. If your shaft is metric, match it directly. Avoid selecting a bore larger than your shaft diameter, as this will require a bushing or set screw to secure.
A keyway provides a mechanical lock between the pulley and shaft, preventing rotational slip under high torque or reversing loads. If your shaft has a pre-cut keyway slot, match the keyway width exactly (3 mm, 4 mm, or 5 mm). If your shaft has no keyway, select the "without keyway" option and secure with a set screw if needed.
These pulleys are designed for 5M HTD (High Torque Drive) timing belts with a 16 mm belt width. They are not compatible with 5M trapezoidal (T5) belts or belts of a different width. Confirm your belt's pitch designation (5M HTD) and width (16 mm) before ordering.
Aluminum alloy pulleys are well-suited for light-to-medium duty applications such as CNC routers, 3D printers, laser engravers, and small conveyor systems. For heavy industrial loads with sustained high torque, consider whether a steel pulley is more appropriate for your specific duty cycle and load requirements.
Yes — each variant is available in a quantity of 1 pc or 2 pcs. Select the quantity option that matches your project needs. If you need one replacement pulley, choose "1"; if you are building a complete drive system with two pulleys, choose "2" to save on a second order.
The pitch diameter (PD) for a 5M pulley is calculated as: PD = (Tooth Count × Pitch) ÷ π. For example, a 20 T pulley has a PD of approximately 31.83 mm (1.25 in), and a 14 T pulley has a PD of approximately 22.28 mm (0.88 in). Use this to calculate center-to-center distance for your belt drive layout.
