Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a slipping or misaligned pulley throws off your print layers or ruins a CNC cut, the root cause is almost always a poorly machined drive gear. Makers, engineers, and desktop fabricators who depend on repeatable motion need a GT2 pulley that holds its bore tolerance and tooth profile run after run.
This GT2 timing belt drive pulley features 20 teeth and a double-headed (flanged) design to keep the belt tracking straight. Available with a 5 mm or 8 mm bore to match the most common stepper motor shaft sizes. The pulley body is typically machined from aluminum alloy with a smooth anodized or natural finish, keeping rotating mass low while maintaining dimensional accuracy. Tooth pitch is the standard GT2 2 mm, compatible with 6 mm wide GT2 belts.
Typical use cases include: replacing worn drive pulleys on Ender, Prusa, or Voron 3D printers; upgrading the X/Y axis on DIY CNC routers and laser engravers; and building custom belt-driven linear motion systems where consistent tooth engagement is critical for positional accuracy.
Standard 2 mm pitch tooth geometry delivers smooth, low-backlash power transmission and is interchangeable with GT2 belts across all major 3D printer and CNC platforms.
Choose the bore that matches your stepper shaft. Both sizes are precision-bored to maintain concentricity and minimize runout during high-speed operation.
Raised flanges on both sides of the pulley keep the GT2 belt centered on the tooth face, preventing lateral drift that causes layer shifts or missed steps.
Machined aluminum construction keeps rotational inertia low, allowing stepper motors to accelerate and decelerate quickly without losing steps.
Includes a set screw for secure shaft attachment. Tighten against the flat of the motor shaft for a slip-free connection that stays put under continuous use.
Order a single replacement or stock up with a multi-pack for builds, repairs, or workshop inventory. All pieces in a pack are matched to the same bore size and tooth count.
| Tooth Count | 20 Teeth |
|---|---|
| Belt Pitch | GT2 — 2 mm |
| Compatible Belt Width | 6 mm |
| Bore Diameter | 5 mm or 8 mm (see variant options) |
| Pulley Type | Double-Headed (Flanged) |
| Material | Aluminum Alloy |
| Shaft Lock | Set Screw |
| Outer Diameter | See variant options |
| Hub Length | See variant options |
| Finish | See variant options |
| Pack Size | 1 / 5 / 10 / 15 / 20 PCS |
Match the bore to your stepper motor's output shaft diameter. Most NEMA 17 motors used in 3D printers have a 5 mm shaft. NEMA 23 motors commonly used in CNC routers typically have an 8 mm shaft. Check your motor's datasheet or measure the shaft with calipers before ordering.
Yes — this pulley is machined to the GT2 2 mm pitch standard and is compatible with any GT2 belt that is 6 mm wide. It fits belts used on Ender 3, Ender 5, CR-10, Prusa i3 MK2/MK3, Voron, and most open-source CNC and laser engraver designs.
A double-headed pulley has raised flanges on both sides of the tooth face. These flanges prevent the belt from walking sideways off the pulley during operation, which is a common cause of layer shifts in 3D printers and positional errors in CNC machines. It is the recommended design for any open-loop belt drive system.
When properly tightened against the flat of the motor shaft using the correct hex key, the set screw provides a secure, slip-resistant connection suitable for the torque levels produced by NEMA 17 and NEMA 23 stepper motors in typical 3D printing and light CNC applications. For best results, apply a small amount of thread-locking compound to the set screw threads.
Aluminum alloy naturally forms a thin oxide layer that provides good resistance to moisture and mild environmental exposure. For indoor workshop or enclosed printer use, no additional treatment is needed. If used in a humid environment, a light coating of machine oil on the bore and hub area is recommended.
Yes. Select the bore size that matches your current motor shaft, loosen the existing set screw, slide out the old pulley, and install the new one. Re-tension your belt after installation and run a test print or dry-run to confirm alignment.
If you are replacing a single failed pulley, the 1 PCS option is sufficient. For a full printer or CNC build with multiple belt axes, the 5 or 10 PCS pack offers better value. Workshop owners and repair technicians often choose the 15 or 20 PCS pack to keep spares on hand for quick turnaround.
