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When a slipping or mismatched pulley throws off your CNC router's repeatability or causes layer shifts in your 3D printer, the entire project suffers. This HTD 8M timing belt pulley is engineered for builders, makers, and automation engineers who need reliable, zero-slip synchronous drive components that install once and stay true.
Each pulley is machined from aluminum alloy with an anodized finish, available in 26T, 28T, and 30T tooth counts. Bore diameters range from 8 mm to 28 mm (approximately 0.31 in to 1.10 in), with keyway variants (K3–K8) available for shaft-locking applications. The pulley body is designed for 15 mm (0.59 in) wide HTD 8M synchronous belts, with a pitch of 8 mm (0.31 in) per tooth.
Typical use cases include CNC router X/Y axis drives requiring HTD 8M 26-tooth aluminum pulley with 12 mm bore, 3D printer extruder and motion systems needing low-backlash 8M timing pulley 28T, and industrial conveyor or automation rigs calling for a synchronous belt pulley 30T with keyway bore for positive shaft engagement.
Choose 26T, 28T, or 30T to match your drive ratio and belt speed requirements across CNC, robotics, and automation builds.
Fits shafts from 8 mm to 28 mm (0.31–1.10 in). Plain bore and keyway variants (K3–K8) available for positive shaft locking without set-screw slip.
Lightweight yet rigid aluminum body keeps rotational inertia low — critical for high-acceleration CNC and 3D printer motion systems.
The curved HTD tooth form distributes load across a larger contact area than trapezoidal profiles, reducing belt wear and maintaining positional accuracy under load.
Integrated flanges keep the 15 mm synchronous belt tracking straight, preventing lateral drift during continuous operation.
Standard HTD 8M pitch and flange dimensions make these pulleys interchangeable with OEM components on most CNC kits and open-source 3D printer frames.
| Belt Type | HTD 8M Synchronous |
|---|---|
| Tooth Pitch | 8 mm (0.31 in) |
| Number of Teeth | 26T / 28T / 30T (see variant options) |
| Applicable Belt Width | 15 mm (0.59 in) |
| Bore Diameter | 8–28 mm plain; keyway variants 8K3–30K8 (see variant options) |
| Material | Aluminum alloy |
| Finish | Anodized |
| Flange | Integrated, both sides |
| Weight | See variant options |
| Quantity per Order | 1 piece |
The tooth count determines your drive ratio. A higher tooth count (30T) moves more belt per revolution, increasing linear speed but reducing torque. A lower count (26T) gives more torque at lower speed. Match your tooth count to your motor RPM and required axis speed — most CNC and 3D printer calculators accept tooth count as a direct input.
A plain bore uses set screws to grip the shaft. A keyway bore (e.g., 10K3 = 10 mm bore with a 3 mm keyway) uses a matching key in the shaft slot for a positive, non-slip connection. Keyway variants are recommended for higher-torque applications or where set-screw marks on the shaft are unacceptable.
Yes — as long as your belt is an HTD 8M profile with 15 mm width. The 8 mm pitch and HTD curved tooth form are standardized, so this pulley is compatible with any HTD 8M belt from any manufacturer at that width.
Aluminum alloy pulleys are the industry standard for CNC routers and 3D printers operating at typical feed rates and loads. The anodized surface adds wear resistance. For very high-torque industrial drives (e.g., heavy conveyor systems), consider whether a steel pulley is more appropriate for your specific load.
The anodized aluminum finish provides good resistance to oxidation and light moisture exposure. It is suitable for indoor workshop and light industrial environments. For outdoor or high-humidity applications, periodic inspection is recommended.
Use a digital caliper to measure the outer diameter of your motor or drive shaft at the point where the pulley will sit. Select the bore size that matches — for plain bores, an exact match is needed. For keyway variants, also measure the keyway width and depth on your shaft to confirm the K-suffix matches (e.g., K3 = 3 mm keyway width).
HTD 8M pulleys are typically used on motion axes (X, Y, Z) rather than extruder drives, which commonly use smaller pitches (GT2 2 mm). Confirm your printer's belt specification before ordering. If your printer uses HTD 8M on its motion system, this pulley is a direct fit.
