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When your 3D printer, CNC router, or robotics build demands consistent belt tension and zero tooth-skip, a worn or mismatched idler pulley is the silent culprit. Engineers and makers who rely on GT2 belt systems need idler and drive pulleys that hold tight tolerances across thousands of cycles — these GT2 10mm smooth-tooth idler drive pulleys are built for exactly that workload.
Each pulley is machined from aluminum alloy with a smooth-tooth GT2 profile, designed for 10mm-wide GT2 timing belts. Available in 16-tooth (16T) and 20-tooth (20T) configurations, with bore options ranging from 3mm to 8mm (approximately 0.12 in to 0.31 in). The compact hub fits standard shaft diameters used in RepRap, CoreXY, and similar open-frame motion systems.
Typical use cases include CoreXY and Cartesian 3D printer belt path routing, CNC laser engraver X/Y axis drive systems, and lightweight robotic arm joint drive assemblies — all applications where a GT2 10mm idler pulley replacement or upgrade is needed for smooth, low-backlash motion.
| Belt Profile | GT2 (2mm pitch) |
|---|---|
| Belt Width | 10mm (0.39 in) |
| Tooth Count | 16T or 20T (see variant options) |
| Bore Diameter | 3mm / 5mm / 6mm / 6.35mm / 8mm (see variant options) |
| Material | Aluminum alloy |
| Tooth Type | Smooth tooth (idler compatible) |
| Outer Diameter | See variant options |
| Hub Width | See variant options |
| Finish | Natural anodized aluminum |
| Pack Quantity | 1 / 5 / 10 / 20 / 50 pcs (see variant options) |
The 16-tooth (16T) pulley has a smaller diameter, making it ideal for compact frames where belt wrap space is limited. The 20-tooth (20T) pulley offers a larger contact arc, which reduces belt stress and is preferred for longer belt runs or higher-speed applications. Check your printer or CNC frame design to confirm which tooth count is specified.
Match the bore to your motor or idler shaft diameter. Common sizes: NEMA 17 motors typically use a 5mm shaft; some use 6.35mm (1/4"). Idler shafts in 3D printers are often M3 (3mm) or M5 (5mm). Measure your shaft with calipers before ordering to ensure a proper fit.
Yes. The GT2 2mm pitch profile is an open standard. These pulleys are compatible with any GT2 timing belt that is 10mm wide, regardless of brand, as long as the belt conforms to the GT2 tooth geometry.
These are smooth-tooth idler drive pulleys. When used as idlers (free-spinning on a fixed shaft), they guide belt tension without driving the belt. When used as drive pulleys (fixed to a motor shaft), a set screw or press fit is required. Check the variant listing for set screw inclusion details.
The aluminum alloy construction provides good rigidity and wear resistance for typical 3D printing and light CNC duty cycles. For high-cycle industrial applications, inspect pulleys periodically for groove wear. The smooth-tooth profile distributes belt load evenly, which helps extend service life compared to sharp-tooth designs.
A drive pulley is attached to a motor shaft and actively moves the belt. An idler pulley spins freely on a fixed shaft and is used to redirect or tension the belt. These smooth-tooth pulleys can serve both roles depending on your setup — as a drive pulley when fixed to a shaft, or as an idler when mounted on a bearing-equipped bolt.
Yes. These pulleys are available in packs of 1, 5, 10, 20, or 50 pieces. Larger pack sizes offer a lower per-unit cost and are well-suited for repair shops, makerspaces, or builders assembling multiple machines.
