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When your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or poorly fitted pulley. Makers, engineers, and desktop fabricators who demand repeatable motion need a pulley that locks onto the shaft without slop and meshes cleanly with the belt. These GT2 2GT timing belt pulleys are engineered for exactly that use case — delivering consistent tooth engagement and a secure stepped bore fit across a wide range of shaft sizes.
Each pulley is machined from aluminum alloy and features a stepped bore design accommodating shaft diameters from 5 mm (~0.197 in) to 20 mm (~0.787 in). Tooth counts span 24T to 70T, and the pulleys are compatible with both 6 mm and 10 mm wide 2GT/GT2 timing belts. Set screws are included to lock the pulley firmly onto the shaft.
Typical applications include open-loop CNC routing machines requiring precise X/Y axis drive, FDM 3D printers (RepRap, CoreXY, Cartesian) using GT2 belt systems, laser engravers, pick-and-place machines, and DIY linear motion platforms where belt-driven positioning is critical.
Accommodates shaft diameters from 5 mm to 20 mm in a single pulley body, reducing the need for adapters.
Choose the gear ratio that suits your drive system — from fast-travel 70T to high-torque 24T configurations.
Includes set screws for secure shaft retention, preventing rotational slippage under load.
Lightweight yet rigid material keeps rotational inertia low while maintaining dimensional accuracy.
Each variant specifies compatibility with either 6 mm or 10 mm wide GT2/2GT belts — select the correct width for your system.
Designed to drop into standard GT2 belt drive systems used in CNC routers, FDM printers, laser cutters, and RepRap platforms.
| Belt Profile | GT2 / 2GT |
|---|---|
| Tooth Count Options | 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 42T, 45T, 48T, 50T, 55T, 60T, 70T |
| Bore Diameter Range | 4 mm – 20 mm (see variant options) |
| Compatible Belt Width | 6 mm or 10 mm (see variant options) |
| Material | Aluminum alloy |
| Bore Type | Stepped bore with set screw |
| Tooth Pitch | 2 mm (GT2 standard) |
| Flange | See variant options |
| Surface Finish | See variant options |
| Weight | See variant options |
The tooth count determines your drive ratio. Fewer teeth (e.g., 24T) give higher torque and finer resolution per motor step, while more teeth (e.g., 70T) increase belt speed per revolution. Match the tooth count to your existing driven pulley or calculate the ratio based on your desired steps-per-mm. For most standard 3D printers using GT2 belts, 20T or 24T driver pulleys are common — pair accordingly.
NEMA 17 stepper motors typically have a 5 mm shaft, so select the 5 mm bore variant. NEMA 23 motors commonly use 6.35 mm (1/4") or 8 mm shafts. CNC spindle or servo applications may use larger shafts up to 20 mm. Always measure your shaft diameter before ordering. The stepped bore design means the pulley body fits a range, but the set screw locks at the specified bore diameter.
Yes. The GT2 / 2GT tooth profile is an open standard with a 2 mm pitch. These pulleys are compatible with any GT2 or 2GT timing belt of the matching width (6 mm or 10 mm). Ensure you select the correct belt width variant — a 6 mm belt will not track properly on a pulley designed for 10 mm, and vice versa.
Aluminum alloy pulleys are well-suited for the torque levels produced by NEMA 17 and NEMA 23 stepper motors in typical CNC and 3D printing applications. For very high-torque industrial drives or applications with significant shock loading, consult your system's torque requirements against the pulley's rated load. For standard desktop CNC routers and FDM printers, aluminum GT2 pulleys are the industry-standard choice.
Yes, set screws are included. They are typically M3 socket head set screws requiring a 1.5 mm or 2 mm hex (Allen) key. Tighten the set screw against a flat on the motor shaft if available, or directly onto a round shaft. Apply a small amount of thread-locking compound for vibration-prone environments.
The belt width affects load capacity and lateral stiffness. 6 mm wide GT2 belts are standard for most desktop 3D printers and light CNC builds. 10 mm wide belts carry higher loads and are preferred for larger-format CNC routers, heavier gantries, or applications requiring greater belt tension without stretching. Select the width that matches your existing belt or the belt specified in your machine's BOM.
These pulleys are designed as drive pulleys (mounted on a motor or shaft with a set screw). For idler applications, you would typically use a flanged bearing or a smooth idler pulley without teeth. Toothed idlers can be used in some CoreXY and H-bot designs — if your design calls for a toothed idler, these pulleys can serve that role when mounted on a bearing-equipped shaft.
