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When a skipped tooth or a loose pulley ruins a print or throws off a CNC cut, the root cause is almost always a mismatched or worn drive component. Engineers, makers, and machine builders who demand repeatable motion need a GT2 timing belt pulley that holds its pitch under load — and that's exactly what this BF-type series is designed to deliver. Whether you're upgrading a CoreXY 3D printer, building a delta robot arm, or retrofitting a laser engraver, selecting the right tooth count and bore diameter is the first step to eliminating backlash.
This GT2 timing belt pulley is machined from aluminum alloy and features a flanged BF-type hub that keeps the belt tracking straight without additional guides. The tooth profile conforms to the GT2 (2mm pitch) standard. Teeth count ranges from 28T to 58T, belt width is fixed at 10mm, and bore diameter options span 4mm to 15mm — including keyway variants (K3, K4, K5) for shaft-locking applications. Overall pulley outer diameter scales with tooth count, typically ranging from approximately 18mm (28T) to approximately 37mm (58T).
Typical use cases include: CoreXY and Cartesian 3D printer X/Y axis drives where 2GT belt pulleys must maintain consistent tension; CNC router and laser engraver gantry systems requiring low-backlash GT2 pulley replacements; and lightweight robotic joint actuators where a flanged timing pulley with a precise bore fit reduces assembly time and shaft runout.
| Belt Profile | GT2 (2mm pitch) |
|---|---|
| Applicable Belt Width | 10mm |
| Number of Teeth | 28T / 30T / 32T / 34T / 35T / 36T / 38T / 40T / 42T / 44T / 45T / 46T / 48T / 50T / 52T / 54T / 56T / 58T |
| Bore Diameter | 4 / 5 / 6 / 6.35 / 8 / 8K3 / 10 / 10K3 / 10K4 / 12 / 12.7 / 12K4 / 12.7K5 / 14 / 14K5 / 15 / 15K5 mm |
| Hub Type | BF-type (double-flanged) |
| Material | Aluminum alloy |
| Outer Diameter (approx.) | See variant options (scales with tooth count) |
| Keyway Options | K3, K4, K5 (available on select bore sizes) |
| Set Screw | See variant options |
| Finish | Natural anodized / machined aluminum |
| Application | 3D printers, CNC routers, laser engravers, robotics, automation |
Tooth count determines the linear distance traveled per motor step. For most CoreXY and Cartesian 3D printers, 20T pulleys are standard, but 28T–40T pulleys are used when a higher gear ratio or larger pulley diameter is needed to reduce belt wrap angle or increase torque. Match the tooth count to your motion controller's steps-per-mm calculation and verify the outer diameter fits within your frame clearance.
BF-type refers to a double-flanged pulley design where raised rims on both sides of the tooth face physically constrain the belt laterally. In most 3D printer and light CNC applications, BF-type pulleys eliminate the need for separate belt guide rollers. For high-speed or heavy-load industrial applications, verify that the flange height is sufficient for your belt tension and alignment tolerance.
Measure your motor or drive shaft diameter precisely with calipers. Common NEMA 17 stepper motor shafts are 5mm; NEMA 23 shafts are typically 6.35mm (1/4") or 8mm. Select the bore that matches your shaft diameter. If your shaft has a flat (D-cut), a round bore with a set screw is usually sufficient. If your shaft has a keyway slot, select the corresponding K3, K4, or K5 keyway bore variant for a positive mechanical lock.
Yes. GT2 and 2GT are industry-interchangeable designations for the same 2mm pitch curvilinear tooth profile. These pulleys are compatible with any GT2 / 2GT open-ended or closed-loop timing belt with a 10mm width. They are not compatible with T2.5, T5, HTD, or other pitch standards.
Standard bore variants use a set screw to clamp the pulley onto a smooth or D-cut shaft — suitable for most 3D printer and light-duty CNC applications. Keyway variants (K3 = 3mm key, K4 = 4mm key, K5 = 5mm key) include a machined slot that accepts a standard parallel key, providing a positive mechanical connection that resists rotational slip under higher torque or reversing loads. Select keyway variants when your shaft already has a matching keyway cut.
Yes, provided the closed-loop belt width is 10mm and the pitch is GT2 (2mm). The pulley tooth profile is identical for open-ended and closed-loop GT2 belts. Ensure the loop circumference and your center-to-center distance are compatible with the tooth count you select — use a belt length calculator to confirm before ordering.
For standard bore variants: slide the pulley onto the shaft, align the set screw with the shaft flat (if present), and tighten with the appropriate hex key. Apply thread-locking compound to the set screw for vibration-prone environments. For keyway variants: insert the key into the shaft keyway, slide the pulley over the key, and secure with the retaining method appropriate for your shaft end (circlip, end cap, or set screw over the key).
