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When a slipping or mismatched pulley throws off your axis repeatability, every print layer and every CNC pass pays the price. Engineers, makers, and motion-system integrators who demand consistent tooth engagement and zero-backlash power transfer rely on a correctly specified 2GT timing pulley — and the BF-type flange design keeps your 10mm belt tracking true under load.
This listing covers 2GT (GT2) profile BF-type timing pulleys with 50, 52, 54, 56, or 58 teeth. The BF designation indicates a flanged body with a smooth bore — available in bore diameters of 5 mm (0.197 in), 6 mm (0.236 in), 6.35 mm (0.250 in / ¼ in), 8 mm (0.315 in), 10 mm (0.394 in), 12 mm (0.472 in), 12.7 mm (0.500 in / ½ in), 14 mm (0.551 in), and 15 mm (0.591 in). Select variants are also available with a machined keyway (3 mm, 4 mm, or 5 mm width) for positive shaft locking. The pulley body is typically machined from aluminum alloy with an anodized or natural finish, keeping rotating mass low while maintaining dimensional accuracy.
Typical use cases include CoreXY and Cartesian 3D printer motion systems requiring large-diameter idler or drive pulleys, CNC router and laser-cutter axis drives where belt-pitch accuracy directly affects cut quality, and custom robotics or automation rigs using 2GT open-loop or closed-loop belt drives with 10mm belt width.
Five tooth counts (50 T, 52 T, 54 T, 56 T, 58 T) let you dial in the exact gear ratio and belt-wrap angle your drive system needs without custom machining.
Nine bore sizes from 5 mm to 15 mm — including the common ¼ in (6.35 mm) and ½ in (12.7 mm) imperial sizes — cover most stepper motor and servo shaft standards.
Choose without keyway for set-screw mounting, or select a 3 mm, 4 mm, or 5 mm keyway for positive torque transmission on high-load or reversing-duty applications.
Integrated flanges on both sides of the tooth profile keep the 10mm belt centered under dynamic loads, reducing edge wear and preventing belt walk-off.
Machined aluminum alloy body minimizes rotational inertia — critical for high-acceleration motion profiles in 3D printers and CNC systems.
Tooth geometry conforms to the 2GT (GT2) standard with 2 mm pitch, ensuring smooth meshing with standard 2GT belts and consistent positional accuracy over long belt runs.
| Belt Profile | 2GT (GT2), 2 mm pitch |
|---|---|
| Belt Width Compatibility | 10 mm |
| Number of Teeth | 50 T / 52 T / 54 T / 56 T / 58 T |
| Bore Diameter | 5 / 6 / 6.35 / 8 / 10 / 12 / 12.7 / 14 / 15 mm |
| Keyway Width | Without keyway / 3 mm / 4 mm / 5 mm (see variant options) |
| Pulley Type | BF (flanged, smooth bore) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Pitch Diameter (50 T) | approx. 31.83 mm (1.253 in) |
| Pitch Diameter (58 T) | approx. 36.92 mm (1.454 in) |
| Hub / Body Width | See variant options |
| Flange Outer Diameter | See variant options |
| Set Screw | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines the pitch diameter and, combined with your motor pulley tooth count, sets the drive ratio. Larger tooth counts (e.g., 56 T or 58 T) give a larger pitch diameter, which increases belt speed per motor revolution and reduces torque multiplication. For most CoreXY 3D printer idler positions, 50–58 T pulleys are used to maintain belt geometry. Calculate your required ratio first, then select the tooth count that achieves it with your chosen motor pulley.
No. This pulley is specifically designed for 10mm wide 2GT belts. The tooth width and flange spacing are sized for 10mm belt width. Using a 6mm belt on this pulley will result in poor tracking and accelerated belt wear. For 6mm belt applications, please select a pulley listed as compatible with 6mm belt width.
For light-duty or unidirectional loads (typical in 3D printer motion systems), a set screw against a flat on the motor shaft is usually sufficient. For higher torque, reversing loads, or applications where shaft slip would be catastrophic (CNC cutting, robotics), a keyway variant provides positive mechanical engagement and is strongly recommended. Select the keyway width that matches your shaft's existing keyway slot.
BF-type pulleys have flanges on both sides of the tooth profile, which actively retains the belt and prevents lateral walk-off — ideal for drive positions where the belt enters and exits the pulley under tension. B-type pulleys typically have a flange on one side only. For most idler and drive pulley positions in CNC and 3D printer systems, BF-type is the safer choice for reliable belt retention.
Aluminum alloy timing pulleys are the industry standard for light-to-medium CNC routing, laser cutting, and 3D printing motion systems. The tooth loads in belt-driven CNC axes are well within the strength limits of machined aluminum. For very heavy-duty industrial applications with high belt tension and shock loads, steel pulleys may be more appropriate — but for the vast majority of hobbyist and professional maker CNC builds, aluminum is the correct material choice.
Measure your motor or drive shaft diameter with a digital caliper. Common stepper motor shaft sizes are 5 mm and 8 mm; servo and NEMA 23 motors often use 6.35 mm (¼ in) or 12.7 mm (½ in) shafts. Select the bore that matches your shaft diameter exactly — a loose bore will cause runout and positional error. If your shaft has a flat, a set-screw variant (without keyway) is sufficient; if it has a machined keyway slot, select the matching keyway width.
Yes. BF-type toothed pulleys are commonly used as idler pulleys in CoreXY and H-bot motion systems to redirect the belt path. When used as an idler, the bore is typically mounted on a shoulder bolt or idler shaft — choose a bore size that matches your idler bolt diameter. No keyway is needed for idler applications.
