Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When your 3D printer or CNC router loses positional accuracy, the culprit is often a worn or mismatched timing pulley. Makers, engineers, and desktop fabricators who demand repeatable, backlash-free motion need a pulley that holds tight tolerances across thousands of cycles. These GT2 aluminum timing pulleys are designed for exactly that use case — drop-in replacements or new-build components that keep your motion system running true.
Each pulley is machined from aluminum alloy, offering a lightweight yet rigid body that resists deformation under belt tension. Available in 20-tooth (20T) and 16-tooth (16T) configurations, with bore options of 5mm, 6.35mm (1/4 inch), and 8mm to match common stepper motor shaft diameters. The pulley width is sized for standard 10mm GT2 timing belts, with an outer diameter typically in the 15–17mm range depending on tooth count.
Typical applications include Cartesian and CoreXY 3D printer X/Y axis drives, CNC router gantry systems requiring precise belt-driven positioning, and lightweight robotics or automation rigs where stepper motor torque must be translated cleanly to linear motion via GT2 belt and pulley systems.
Choose 20-tooth for standard GT2 drive ratios or 16-tooth for higher resolution and finer micro-stepping — both machined to GT2 tooth profile spec for accurate belt engagement.
Available in 5mm, 6.35mm (1/4"), and 8mm bore diameters to fit the most common stepper motor shaft sizes used in desktop 3D printers and CNC machines.
Machined aluminum body keeps rotating mass low, reducing inertia for faster acceleration and deceleration — critical for high-speed 3D printing and responsive CNC moves.
Designed specifically for 10mm-wide GT2 timing belts, the most widely used belt width in desktop motion systems. No adapters or spacers required.
Includes set screw(s) for secure shaft clamping, preventing slippage under load and maintaining positional accuracy during extended print or cutting sessions.
Available as 1pc, 2pcs, or 5pcs per order — stock up for multi-axis builds, spare parts inventory, or workshop kits without overpaying for single-unit pricing.
| Tooth Count | 16T or 20T (see variant options) |
|---|---|
| Belt Type | GT2 |
| Belt Width | 10mm |
| Bore Diameter | 5mm / 6.35mm / 8mm (see variant options) |
| Material | Aluminum Alloy |
| Outer Diameter | See variant options |
| Flange | Flanged (standard GT2 pulley profile) |
| Retention | Set screw(s) |
| Compatible Belt Width | 10mm |
| Tooth Profile | GT2 (2mm pitch) |
| Finish | Natural aluminum / anodized (see variant options) |
| Pack Quantity | 1pc / 2pcs / 5pcs (see variant options) |
The tooth count determines your drive ratio and linear resolution. A 20-tooth GT2 pulley moves the belt 40mm per motor revolution (20 teeth × 2mm pitch), while a 16-tooth pulley moves 32mm per revolution. Fewer teeth = finer resolution per step, which can improve print detail or CNC accuracy at the cost of slightly lower top speed. Most standard 3D printer builds use 20T; choose 16T if you want higher positional resolution.
Measure your stepper motor's output shaft diameter before ordering. NEMA 17 motors typically have a 5mm shaft. Some NEMA 17 and most NEMA 23 motors use 6.35mm (1/4") or 8mm shafts. If you are unsure, check your motor's datasheet or use a caliper to measure the shaft directly. A bore that is too large will not clamp securely even with the set screw tightened.
Yes — these pulleys are machined to the GT2 tooth profile (2mm pitch) and are designed for 10mm-wide GT2 belts, which is the standard width used in most Cartesian and CoreXY 3D printers. If your belt is a different width (e.g., 6mm), this pulley will not be the correct fit. Always confirm your belt width before purchasing.
Aluminum alloy provides a good balance of strength and low weight for typical desktop 3D printer and light CNC applications. Under normal GT2 belt tension (typically 5–15N for desktop systems), aluminum pulleys perform reliably over extended use. For heavy-duty industrial applications with very high belt tension, a steel pulley may be more appropriate. For the vast majority of maker and desktop fabrication use cases, aluminum is the standard and preferred choice.
Aluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For standard 3D printing and CNC workshop use, this is more than sufficient. If your application involves exposure to moisture, cutting fluids, or harsh chemicals, consider applying a light protective coating or selecting an anodized variant where available.
Yes. GT2 20T pulleys are the most common choice for CoreXY and H-bot motion systems. The 10mm belt width variant is compatible with the belt routing used in popular open-source printer designs. Ensure you also have the correct idler pulleys (smooth bore, no teeth) for the non-driven belt path — this listing covers the driven (toothed) pulleys only.
A standard Cartesian printer (e.g., Ender-style) uses 2 driven pulleys — one per axis (X and Y). A CoreXY printer typically uses 2 driven pulleys on the two motors. Ordering the 2pcs pack covers a single printer build; the 5pcs pack is ideal if you are building multiple machines or want spares on hand for maintenance.
