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When a mismatched or worn pulley causes skipped steps, lost position, or belt slippage in your CNC router, 3D printer, or laser engraver, the entire build suffers. Engineers, makers, and automation integrators who demand repeatable, backlash-free motion need a GT2 timing belt pulley they can rely on — one that seats cleanly on the shaft and grips the belt without creep. This BF-type pulley series is designed for exactly that use case.
Each pulley is machined from aluminum alloy with a hard-anodized or natural finish and features the GT2 (2mm pitch) tooth profile. The BF-type flange design keeps the belt tracking straight under load. Available in 24T through 70T tooth counts, belt widths of 6mm and 10mm, and bore diameters from 4mm to 20mm (including 6.35mm / 1/4" and 12.7mm / 1/2" imperial sizes), these pulleys cover the widest range of shaft and belt combinations in one consistent product line.
Typical applications include CNC router X/Y/Z axes requiring 2mm-pitch GT2 belt drive systems, 3D printer CoreXY and Cartesian motion platforms using 6mm GT2 belts, stepper-motor-driven laser engravers and plasma cutters, and light-duty robotic arm joints or linear actuator assemblies where a 10mm-wide GT2 belt pulley provides additional torque capacity.
Seventeen tooth-count options from 24T to 70T let you dial in the exact gear ratio for your drive system without compromise.
Choose 6mm for lightweight 3D printer and laser engraver axes, or 10mm for higher-torque CNC and automation applications.
Fifteen bore sizes — including 6.35mm (1/4") and 12.7mm (1/2") imperial standards — accommodate NEMA 17, NEMA 23, and custom shafts.
Dual flanges on both sides of the tooth profile keep the GT2 belt centered and prevent lateral walk during high-speed or high-load operation.
The GT2 curvilinear tooth form reduces backlash and distributes belt load evenly across multiple teeth for smooth, low-noise motion.
Each pulley includes a set-screw bore for secure shaft clamping — no press-fit required, making installation and replacement straightforward.
| Belt Profile | GT2 (2mm pitch) |
|---|---|
| Pulley Type | BF-Type (flanged, both sides) |
| Number of Teeth | 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 42T, 45T, 48T, 50T, 55T, 60T, 70T |
| Belt Width | 6mm / 10mm |
| Bore Diameter | 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 19mm, 20mm |
| Material | Aluminum alloy |
| Shaft Retention | Set screw |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Compatible Belt | GT2 open-loop or closed-loop timing belt, 6mm or 10mm width |
The tooth count determines your drive ratio. Pair a smaller pulley on the motor shaft with a larger pulley on the driven shaft to reduce speed and increase torque, or use equal tooth counts for a 1:1 ratio. For most CNC and 3D printer axes, 20T–40T on the motor is common. This listing covers 24T through 70T, so you can match both the driving and driven sides from one product line.
The belt width affects the torque capacity and lateral stiffness of the drive. A 6mm GT2 belt and pulley is standard for lightweight 3D printer axes and small laser engravers. A 10mm GT2 belt and pulley handles higher loads and is preferred for CNC routers, heavier gantries, and automation systems where belt stretch or slip under load is a concern.
Match the bore to your motor or shaft diameter. NEMA 17 stepper motors typically have a 5mm shaft; NEMA 23 motors commonly use 6.35mm (1/4") or 8mm shafts. Check your motor or shaft spec sheet before ordering. This series includes both metric (4–20mm) and imperial (6.35mm / 12.7mm) bore options to cover the widest range of hardware.
BF-type refers to a flanged pulley design with dual flanges on both sides of the tooth profile. The flanges act as guides that keep the timing belt centered on the pulley during operation. Without flanges, belts can walk sideways under load or at speed, causing misalignment, noise, or premature belt wear. BF-type pulleys are recommended for any axis where the belt is not otherwise constrained laterally.
Yes. The GT2 2mm-pitch tooth profile is an industry-standard specification. These pulleys are compatible with any GT2 open-loop or closed-loop timing belt of the matching width (6mm or 10mm) from any manufacturer, including common 3D printer and CNC belt brands.
Each pulley uses a set-screw (grub screw) for shaft retention. Tighten the set screw against the flat or round surface of the shaft using the appropriate hex key. For best results, align the set screw with a flat on the motor shaft if one is present. No press-fit or special tooling is required, making installation and future replacement straightforward.
The pulleys are machined from aluminum alloy, which offers a favorable strength-to-weight ratio for motion control applications. Aluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid or outdoor environments, consider applying a light coating of machine oil to exposed surfaces. These pulleys are not rated for immersion or highly corrosive chemical exposure.
