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When a slipping or mismatched pulley stalls your CNC router, 3D printer, or conveyor mid-run, the cost is more than downtime — it's lost precision and rework. Engineers, makers, and automation builders who demand repeatable, zero-slip power transmission need a timing pulley that holds tolerance under load. These 5M pitch timing pulleys are engineered for exactly that.
Each 5M timing pulley synchronous wheel is machined from aluminum alloy, featuring a standard 5M tooth profile (5 mm pitch) with tooth counts ranging from 10T to 18T. Belt groove widths are available in 16 mm and 21 mm to match common 5M synchronous belt widths. Bore diameters span 5 mm to 15 mm (approximately 0.197" to 0.591"), with K-type (solid bore) and BF-type (flanged bore with set-screw) configurations available across the variant matrix.
Typical use cases include CNC axis drives requiring consistent step accuracy, 3D printer extruder and motion systems using 5M GT/HTD belt profiles, robotic arm joint actuators needing compact synchronous drive reduction, and light industrial conveyor or indexing table drives where slip-free timing is critical.
Standard 5 mm pitch tooth geometry ensures accurate mesh with 5M synchronous belts, maintaining consistent angular velocity and minimizing backlash in precision motion systems.
Six tooth count options — 10T, 12T, 14T, 15T, 16T, and 18T — let you dial in the exact drive ratio and pitch diameter your application requires without custom machining.
Bore options from 5 mm to 15 mm (including 6 mm, 6.35 mm, 7 mm, 8 mm, 10 mm, 11 mm, 12 mm, 12.7 mm, and 14 mm) accommodate a wide range of motor and shaft diameters out of the box.
Choose 16 mm groove for 15 mm wide 5M belts or 21 mm groove for 20 mm wide belts, giving you flexibility across different load and torque requirements.
K-type (solid bore) and BF-type (flanged with set-screw) variants are available, enabling secure shaft mounting without additional machining in most standard drive setups.
Lightweight aluminum alloy body reduces rotational inertia for faster acceleration response while providing adequate strength for typical synchronous belt drive loads in CNC and automation applications.
| Belt Pitch | 5M (5 mm) |
|---|---|
| Tooth Profile | HTD 5M / GT2 5M compatible |
| Tooth Count (Types) | 10T, 12T, 14T, 15T, 16T, 18T |
| Groove Width | 16 mm / 21 mm |
| Bore Diameter | 5 mm – 15 mm (see variant options) |
| Bore Type | K-type (solid) / BF-type (flanged, set-screw) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Pitch Diameter (10T) | approx. 15.92 mm (0.627") |
| Pitch Diameter (18T) | approx. 28.65 mm (1.128") |
| Packing Quantity | 1 pc per unit (see variant options for multi-pack) |
| Compatible Belt Width | 15 mm (16 mm groove) / 20 mm (21 mm groove) |
Tooth count determines the pitch diameter and, combined with your driven pulley's tooth count, sets your drive ratio. Fewer teeth (e.g., 10T) give a smaller pitch diameter — useful for compact drives or higher reduction ratios. More teeth (e.g., 18T) increase pitch diameter, which can reduce belt tension and improve torque capacity. Match your required speed ratio first, then verify the resulting center distance fits your frame.
K-type pulleys have a plain (solid) bore — the shaft is typically secured with a key or interference fit. BF-type pulleys include a flange and one or more set-screw holes, allowing tool-free shaft clamping without a keyway. BF-type is more common in CNC and 3D printer builds where quick assembly and adjustment are needed.
Select the groove width that matches your belt width. The 16 mm groove is designed for 15 mm wide 5M synchronous belts; the 21 mm groove fits 20 mm wide belts. Using a mismatched width can cause the belt to track off-center or reduce load capacity. Check your belt's width specification before selecting.
These pulleys use the standard 5M tooth pitch (5 mm center-to-center). HTD 5M and GT2 5M belts share the same pitch and are generally cross-compatible with 5M pulleys, though tooth flank geometry differs slightly. For most hobbyist and light industrial applications the fit is acceptable; for high-precision or high-load drives, confirm belt profile compatibility with your belt supplier.
Measure your motor or drive shaft diameter with a caliper. Select the bore option that matches exactly — a bore that is too large will cause runout and vibration. Common motor shaft sizes include 5 mm (NEMA 17 stepper), 6.35 mm (1/4" imperial shafts), 8 mm (NEMA 23 stepper), and 10–12 mm (servo motors and larger steppers). If your shaft has a flat (D-cut), choose a BF-type variant and tighten the set-screw against the flat.
Aluminum alloy pulleys are well-suited for light-to-medium duty synchronous drives typical of CNC routers, 3D printers, laser cutters, and small conveyor systems. Exact load ratings depend on belt tension, speed, and tooth engagement. For heavy industrial loads or continuous high-torque applications, consider steel pulleys. If in doubt, contact us to confirm suitability for your specific load conditions.
Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid, wet, or chemically aggressive environments, additional surface treatment (anodizing or coating) is recommended. Contact us to confirm the finish available on your selected variant.
