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When your 3D printer skips steps or your CNC axis loses position, the culprit is often a poorly fitted pulley. Engineers, makers, and automation builders who demand repeatable, backlash-free motion need a GT2 timing belt pulley BF-type that fits exactly right — every time. This listing covers the full range of BF-type (flanged, no-teeth-on-hub) pulleys designed specifically for 6mm wide GT2 timing belts.
Each pulley is machined from aluminum alloy with a natural anodized or silver finish, featuring a flanged body to keep the belt tracking true. Tooth counts range from 30T to 60T, and bore diameters span 5mm to 12mm (approximately 0.197" to 0.472"), accommodating the most common motor shaft sizes used in desktop motion systems. Set-screw retention is included to lock the pulley securely onto the shaft.
Typical applications include FDM 3D printer X/Y axis drives (GT2 belt-driven CoreXY and Cartesian systems), desktop CNC router feed axes, laser engraver gantry drives, and lightweight robotic arm joints requiring low-backlash GT2 belt transmission.
| Belt Type | GT2 (2mm pitch) |
|---|---|
| Belt Width Compatibility | 6mm |
| Pulley Type | BF-Type (Flanged, smooth hub face) |
| Tooth Count Options | 30T, 36T, 40T, 48T, 60T |
| Bore Diameter Options | 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 12mm |
| Material | Aluminum alloy |
| Finish | Natural anodized / silver |
| Shaft Retention | M3 set screw(s) |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Weight | See variant options |
Tooth count determines your drive ratio and belt speed. A 30T pulley paired with a 60T pulley gives a 2:1 reduction, halving speed and doubling torque. For most 3D printer X/Y axes, 20T–40T pulleys are standard. If you are replacing an existing pulley, match the tooth count exactly to maintain your steps-per-mm calibration.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. Some NEMA 17 motors with a D-shaft flat will benefit from a set-screw lock against the flat for zero-slip performance. NEMA 23 motors typically use an 8mm or 6.35mm (1/4") shaft — select accordingly.
Yes. BF-type GT2 pulleys are compatible with both open-loop GT2 timing belts and closed-loop GT2 belt loops, provided the belt width is 6mm and the pitch is 2mm. Confirm the inner circumference of your closed-loop belt matches the pulley tooth count and center distance of your system.
BF-type pulleys have a smooth (non-toothed) hub face with flanges on both sides of the toothed section. B-type pulleys have a toothed hub face. BF-type is the most common choice for standard belt-drive motion systems where the belt wraps around the toothed section only. If your design requires teeth on the hub face for a specific engagement geometry, you would need a B-type pulley instead.
Aluminum alloy pulleys with an anodized finish offer good corrosion resistance in typical indoor workshop and machine environments. For high-humidity or outdoor applications, periodic inspection is recommended. The GT2 tooth profile distributes belt load evenly across multiple teeth, which significantly reduces localized wear compared to V-belt or flat-belt systems.
Slide the pulley onto the motor shaft and position it at the correct axial location. Use a 1.5mm or 2mm hex key (Allen key) to tighten the M3 set screw against the shaft. If your shaft has a D-flat, align the set screw with the flat before tightening for maximum torque transfer. Do not overtighten — snug is sufficient to prevent slippage without damaging the shaft.
Yes. BF-type GT2 pulleys are widely used in CoreXY, HBot, and Cartesian 3D printer builds. For CoreXY systems, 20T pulleys are most common for the driven pulleys, while idler pulleys (smooth bore) handle belt redirection. This listing covers driven pulleys with teeth — confirm your tooth count matches your firmware steps-per-mm setting after installation.
