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When your motion-control build demands repeatable, slip-free power transfer, a mismatched or worn drive pulley is the first point of failure. Engineers, CNC builders, and robotics makers who rely on 8M pitch timing systems need a pulley that holds tolerance under load — not one that creeps, strips, or wobbles under sustained duty cycles.
This 8M 30T timing belt pulley features 30 teeth machined to the 8M tooth profile, with a pitch diameter calculated for standard 8M synchronous belts. The bore range spans 8 mm to 30 mm (approximately 0.31 in to 1.18 in), with groove widths available from 16 mm to 42 mm (0.63 in to 1.65 in) to match your belt width. Select variants also include a keyway bore option for positive shaft engagement.
Typical use cases include CNC router X/Y axis drives, 3D printer extruder and motion systems requiring 8M belt compatibility, conveyor and indexing table drives in light industrial automation, and DIY robotics platforms where precise angular positioning is critical.
Machined to the 8M tooth geometry for accurate mesh with standard 8M synchronous belts, minimizing backlash and tooth skip under load.
Available bore diameters from 8 mm to 30 mm (0.31–1.18 in) cover common shaft sizes in CNC, robotics, and automation builds. Keyway bore options available on select variants.
Six groove widths — 16 mm, 21 mm, 27 mm, 32 mm, 40 mm, and 42 mm — let you match the pulley to your specific belt width without modification.
Tooth pitch and bore concentricity are held to close tolerances, ensuring smooth belt tracking and reducing vibration in high-cycle applications.
Order as a single pulley for prototyping or in a 5-piece pack for production builds, replacement stock, or multi-axis systems.
Standard round bore variants mount directly onto the shaft with a set screw. Keyway bore variants (where specified) provide positive rotational engagement for higher-torque applications.
| Tooth Count | 30T |
|---|---|
| Belt Pitch | 8M (8 mm pitch) |
| Bore Diameter Range | 8 mm – 30 mm (0.31 in – 1.18 in) |
| Groove Width Options | 16 mm / 21 mm / 27 mm / 32 mm / 40 mm / 42 mm |
| Keyway Bore | See variant options |
| Material | See variant options |
| Finish | See variant options |
| Packing Quantity | 1 pc or 5 pcs (see variant options) |
| Compatible Belt Type | 8M synchronous timing belt |
| Mounting | Set screw (standard bore); keyway (select variants) |
The groove width of the pulley must match the width of your 8M timing belt. Measure your belt width and select the corresponding groove option: 16 mm, 21 mm, 27 mm, 32 mm, 40 mm, or 42 mm. Using a pulley narrower than your belt will cause the belt to ride over the flanges; using one wider than the belt is generally acceptable but may reduce lateral guidance.
Measure your shaft diameter with a caliper. Select the bore option that matches your shaft size exactly — a bore that is too large will cause runout and slippage even with a set screw tightened. Available bore sizes range from 8 mm to 30 mm. For shafts with a keyway, choose a keyway bore variant (e.g., 20mm(6×2.8mm) or 25mm(8×3.3mm)) where the numbers in parentheses indicate the keyway width × depth.
The keyway bore designation indicates a bore with an integrated keyway slot. The format is: bore diameter (keyway width × keyway depth). For example, 20mm(6×2.8mm) means a 20 mm bore with a 6 mm wide × 2.8 mm deep keyway. This matches standard metric key stock and provides positive rotational drive between the shaft and pulley, which is recommended for higher-torque or reversing-load applications.
Yes — this pulley is machined to the standard 8M tooth profile, which is compatible with all standard 8M pitch synchronous timing belts regardless of brand. Ensure the groove width matches your belt width. The 30-tooth count sets the pitch diameter; if your system requires a specific gear ratio, verify the tooth count on both the drive and driven pulleys.
Load capacity depends on the material of the specific variant selected. For precise load ratings, refer to the variant specifications or contact us to confirm. In general, metal variants are suited for sustained mechanical loads in CNC and automation applications, while the tooth profile geometry distributes belt tension evenly across multiple teeth to reduce stress concentration.
Corrosion resistance depends on the material and finish of the variant you select. If your application involves moisture, coolant exposure, or outdoor conditions, contact us to confirm which variant material is appropriate. For most indoor CNC and dry automation environments, standard variants perform reliably without additional treatment.
The 1-piece option is ideal for prototyping, single-axis builds, or replacement of a single worn pulley. The 5-piece pack offers a lower per-unit cost and is practical for multi-axis machines, production line builds, or keeping spares on hand for maintenance. Both options ship in the same bore and groove configuration you select.
