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When a slipping or misaligned pulley throws off your print layers or CNC cut path, the entire job is ruined. Engineers, makers, and machine builders who rely on repeatable motion control need GT2 10mm timing belt pulleys that hold their position under load. These synchronous wheels are designed for anyone running GT2 belt-driven systems — from desktop 3D printers to full-scale CNC routers and robotic actuators.
Each pulley is machined from aluminum alloy with a natural silver anodized finish. The belt-contact surface spans 10mm (0.39 in) in width, matching standard GT2 10mm open-loop and closed-loop belts. Tooth counts range from 16T to 120T (pitch diameter approximately 10.2mm–76.4mm / 0.40 in–3.01 in), and bore options span 4mm to 25mm (0.16 in–0.98 in) to suit a wide range of shaft diameters. Boss styles include Small Boss and Large Boss configurations depending on the tooth count selected.
Typical use cases include GT2 belt-driven 3D printer X/Y axis drives, CNC router gantry synchronization, laser engraver carriage systems, and lightweight robotic joint actuators requiring low-backlash synchronous motion.
| Belt Type | GT2, 2mm pitch |
|---|---|
| Belt Width | 10mm (0.39 in) |
| Tooth Count Range | 16T – 120T |
| Bore Diameter Range | 4mm – 25mm (0.16 in – 0.98 in) |
| Boss Style | See variant options |
| Material | Aluminum alloy |
| Finish | Natural anodized |
| Pitch Diameter | See variant options |
| Quantity per Order | 1 piece |
| Set Screw | See variant options |
The tooth count determines the pitch diameter and, combined with your motor pulley, sets the drive ratio. For 3D printer X/Y axes, 20T is the most common choice for a balanced speed-to-torque ratio. Larger tooth counts (e.g., 40T–120T) are used as driven pulleys to reduce speed and increase torque. Match your tooth count to the belt loop length and center distance of your system.
Most NEMA 17 stepper motors use a 5mm shaft, so the 5mm bore is the most common choice for 3D printers. NEMA 23 motors typically use 6.35mm (1/4 in) or 8mm shafts. Servo motors and DC motors vary widely — measure your shaft diameter with calipers before selecting. The bore must match your shaft exactly; a loose fit will cause slippage even with a set screw.
The boss refers to the hub section that extends beyond the pulley flange. A Large Boss provides a longer hub, giving more contact area for the set screw and better grip on the shaft — useful when axial forces are present or when the shaft engagement length is critical. A Small Boss is more compact and suits space-constrained installations. The available boss style is determined by the tooth count variant you select.
Yes. GT2 is an open industry standard defined by a 2mm pitch and a specific tooth profile radius. These pulleys conform to the GT2 profile and will mesh correctly with any GT2-standard belt — open-loop or closed-loop — regardless of brand, as long as the belt width is 10mm.
These pulleys use a set screw (grub screw) to clamp onto the shaft. Align the set screw hole with a flat on the motor shaft if one is present, then tighten with the appropriate hex key. For shafts without a flat, apply thread-locking compound to the set screw to prevent loosening under vibration. Do not overtighten, as this can deform the bore on smaller pulleys.
Aluminum alloy maintains structural integrity up to approximately 150–200°C (300–390°F) under moderate load, making these pulleys suitable for most enclosed 3D printer chambers and light industrial environments. For sustained high-temperature or chemically aggressive environments, verify the specific alloy rating against your operating conditions.
GT2 belts should be tensioned so they produce a clear, consistent tone when plucked — typically described as a low musical note rather than a slack thud or an overly tight twang. Excessive tension accelerates bearing wear on your motor; insufficient tension causes tooth skipping under acceleration. Refer to your machine's documentation for the specific tension value, as it varies by belt length and span.
