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When a slipping or misaligned drive wheel stalls your CNC router, 3D printer, or conveyor mid-run, the cost is more than downtime — it's scrapped parts and lost confidence in your build. Engineers, makers, and automation integrators who demand repeatable, slip-free power transmission need a timing belt pulley that holds its position under load. These HTD-8M timing belt pulleys are engineered for exactly that scenario.
Each pulley is machined from aluminum alloy with a black anodized finish, featuring an 8mm HTD pitch profile and a fixed 32mm belt width (W32). Tooth counts range from 12T to 60T, bore diameters from 8mm to 30mm (0.31" to 1.18"), and keyway dimensions from 3×1.4mm up to 8×3.3mm — all matched to standard DIN 6885 keyway tolerances. The set-screw locking bore ensures secure shaft engagement without adhesives.
Typical use cases include CNC gantry axis drives requiring precise step-to-distance ratios, robotic arm joint actuators where backlash must be minimized, and industrial conveyor or indexing table drives where the 8mm HTD tooth profile delivers higher torque capacity than 5M or 3M alternatives. The wide tooth engagement of the HTD-8M profile also makes it a reliable choice for timing belt pulley replacement in laser cutters and plasma tables.
The rounded HTD tooth form distributes belt load across a larger contact area, reducing tooth shear stress and extending belt life compared to trapezoidal MXL or T-series profiles.
Sixteen tooth-count options let you dial in exact gear ratios for stepper or servo-driven axes. Pair a 12T drive pulley with a 60T driven pulley for a 5:1 reduction without a gearbox.
Keyway slots (3×1.4mm through 8×3.3mm) are machined to DIN 6885 tolerances, ensuring positive torque transfer and eliminating rotational slip under reversing loads.
The black anodized surface resists oxidation and abrasion, keeping the pulley dimensionally stable in dusty CNC environments or humid workshop conditions.
The W32 flange width is consistent across all tooth counts, so you can swap tooth counts within a build without changing belt width or flange hardware.
Each pulley includes a set-screw bore for quick shaft installation and removal during prototyping or maintenance — no press-fit tooling required.
| Belt Pitch | 8mm (HTD-8M) |
|---|---|
| Tooth Profile | HTD (curvilinear) |
| Belt Width (W) | 32mm |
| Number of Teeth | 12T, 14T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 40T, 44T, 50T, 60T |
| Bore Diameter | 8mm, 10mm, 12mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, 24mm, 25mm, 28mm, 30mm |
| Keyway Dimensions | 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (DIN 6885) |
| Pitch Diameter Range | Approx. 30.6mm – 152.8mm (1.20" – 6.02") depending on tooth count |
| Material | Aluminum alloy |
| Surface Finish | Black anodized |
| Shaft Locking | Set screw |
| Quantity per Order | 1 piece |
Tooth count determines the pitch diameter and, combined with your driven pulley's tooth count, sets the drive ratio. For CNC axes, match the tooth count to your desired steps-per-mm: a smaller tooth count gives a finer resolution per motor step, while a larger count increases linear speed per revolution. Common pairings are 20T drive / 40T driven (2:1) or 15T / 30T (2:1) for balanced torque and speed.
Match the bore diameter exactly to your shaft OD. The keyway size is determined by the shaft diameter per DIN 6885: 8mm shaft → 3×1.4mm keyway; 10–12mm shaft → 4×1.8mm; 14–17mm shaft → 5×2.3mm; 18–22mm shaft → 6×2.8mm; 24–30mm shaft → 8×3.3mm. If your shaft has no keyway, select the bore size only and rely on the set screw for light-duty applications.
Yes — any standard HTD-8M belt with an 8mm pitch and 32mm width (W32) will mesh correctly with these pulleys. The HTD curvilinear tooth profile is an industry-standard geometry. Ensure your belt width matches W32; using a narrower belt (e.g., W20 or W25) will reduce load capacity and may cause tracking issues.
Aluminum alloy pulleys are well-suited for the torque levels typical of NEMA 17/23 stepper motors and small servo motors used in CNC routers, 3D printers, and light automation. For heavy industrial drives with large servo motors (above ~5 Nm continuous), consider whether a steel pulley is more appropriate. The anodized surface also adds surface hardness, reducing wear at the belt-tooth interface.
Aluminum does not rust, and the black anodized coating adds an additional oxide layer that resists mild chemical exposure, humidity, and abrasion. These pulleys are suitable for indoor workshop, laboratory, and light industrial environments. For outdoor or salt-spray environments, additional protective measures may be needed.
All variants include a keyway slot machined into the bore. If your shaft has no keyway, you can still use the pulley by tightening the set screw against the shaft — this works for low-torque or unidirectional loads. For reversing or high-torque applications, a matching key in the shaft keyway is strongly recommended to prevent rotational slip.
Pitch diameter (PD) = (Number of Teeth × Pitch) ÷ π. For example: 20T → PD = (20 × 8) ÷ 3.1416 ≈ 50.9mm (2.00"); 30T → PD ≈ 76.4mm (3.01"); 40T → PD ≈ 101.9mm (4.01"). Use this to calculate belt length and center distance for your drive layout.
