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When a slipping or mismatched pulley stalls your CNC router, 3D printer, or robotic axis mid-job, the cost is more than downtime — it's scrapped parts and lost confidence in your build. Engineers, makers, and small-batch manufacturers who need repeatable, zero-slip synchronous motion rely on HTD-3M timing belt pulleys to keep every axis locked in sync.
This listing covers HTD-3M timing belt pulleys with a 3mm tooth pitch and a 16mm applicable belt width. The pulleys are machined from aluminum alloy (AF-type, without step flange) and are available in tooth counts from 12T to 90T. Bore diameters range from 4mm (~0.16 in) up to 25mm (~0.98 in), with keyed-bore variants (e.g., 8/3×1.4mm, 12/5×2.3mm) also available for shaft-locking applications.
Typical use cases include: CNC router X/Y/Z axis drives requiring HTD-3M belt pulley sets, 3D printer extruder and motion systems using 3mm pitch synchronous pulleys, and lightweight robotic arm joints or conveyor drives where a compact aluminum timing pulley with 16mm belt width is specified.
| Belt Type | HTD-3M (3mm pitch) |
|---|---|
| Tooth Pitch | 3mm |
| Number of Teeth | 12T – 90T (see variant options) |
| Applicable Belt Width | 15mm / 16mm |
| Bore Diameter | See variant options (4mm – 25mm; keyed bores available) |
| Keyway Dimensions | See variant options (e.g., 3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, 8×3.3mm) |
| Material | Aluminum alloy |
| Type | AF-type (without step / flangeless) |
| Pulley Width | 16mm nominal |
| Finish | Natural anodized / machined |
| Weight | See variant options |
The tooth count determines your drive ratio. Divide the driven pulley teeth by the driver pulley teeth to get the reduction ratio. For example, a 12T driver paired with a 60T driven pulley gives a 5:1 reduction. For CNC routers and 3D printers, common driver pulleys are 20T–36T paired with same-size or larger driven pulleys depending on the desired linear resolution.
Measure your motor or drive shaft diameter precisely with calipers. Select the plain bore option that matches your shaft (e.g., 8mm bore for an 8mm shaft). If your shaft has a keyway, select the corresponding keyed bore variant (e.g., "8/3×1.4mm" means 8mm bore with a 3mm wide × 1.4mm deep keyway). Always verify the keyway dimensions match your shaft's key before ordering.
Yes. These pulleys are machined to the HTD-3M tooth profile standard (3mm pitch, HTD curvilinear tooth form). They are compatible with any HTD-3M open or closed-loop timing belt with a 15mm or 16mm width. Do not use with MXL, GT2, or T-type belts — the tooth profiles are not interchangeable.
AF-type (also called "without step" or flangeless) pulleys have no raised rim on the sides of the groove. The belt relies on the system's frame guides or tensioner alignment to stay tracked. Flanged pulleys have a raised collar on one or both sides to physically retain the belt. AF-type is preferred in compact assemblies where the belt path is already constrained by the frame.
Aluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives such as CNC routers, 3D printers, laser cutters, and small robotic joints. For heavy industrial loads or high-torque applications (e.g., large servo motors above 1kW), consider steel pulleys. The aluminum construction keeps weight and rotational inertia low, which benefits high-acceleration servo systems.
No machining is required if you select the correct bore variant. The pulleys are supplied with the bore diameter and keyway (if applicable) already machined to the specified dimensions. Simply select the variant matching your shaft diameter and keyway size. If your shaft size is not listed, contact us to confirm availability of custom bore options.
Aluminum alloy has natural oxidation resistance, making these pulleys suitable for indoor automation and light outdoor use. For prolonged exposure to moisture, salt spray, or corrosive chemicals, consider applying a protective coating or selecting stainless steel alternatives. Routine inspection and lubrication of the shaft interface is recommended in humid environments.
