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When a slipping or mismatched pulley causes positioning errors in your CNC router, 3D printer, or conveyor system, the entire build suffers. These 5M pitch K-type timing belt pulleys are engineered for makers, machine builders, and automation engineers who need repeatable, slip-free synchronous motion without the guesswork of sourcing mismatched components.
Each pulley is machined from aluminum alloy with a natural silver finish. The 5M series features a 5 mm pitch profile compatible with standard 5M open-end and closed-loop timing belts. Tooth count ranges from 10 T to 14 T, tooth (belt) width options span 11 mm, 16 mm, and 21 mm (~0.43 in, 0.63 in, 0.83 in), and bore diameters cover 4 mm, 5 mm, 6 mm, 6.35 mm, 8 mm, 10 mm, and 12 mm. Optional K-type keyway widths of 3 mm or 4 mm are available on select bore sizes for positive shaft locking.
Typical applications include desktop CNC milling machines requiring 5M synchronous belt drives, DIY laser engravers and plasma cutters needing precise X/Y axis motion, and light-duty conveyor or pick-and-place automation systems where consistent tooth engagement and low backlash are critical.
Choose from 10, 12, 13, or 14 teeth to dial in your drive ratio. Fewer teeth increase speed; more teeth increase torque — select the count that matches your axis load and speed requirements.
Compatible with common motor shaft diameters from 4 mm up to 12 mm, covering NEMA 17, NEMA 23, and many servo motor output shafts used in CNC and robotics builds.
Select variants include a 3 mm or 4 mm keyway slot machined to K-type tolerance, preventing rotational slip under load — essential for high-torque or reversing-direction applications.
Match the pulley tooth width to your belt width for full tooth engagement. Wider belts carry more load; narrower belts suit compact, lightweight axis designs.
Machined from aluminum alloy for a balance of light weight and structural rigidity. Suitable for indoor automation environments and typical CNC duty cycles.
Order as a single pulley for replacement or prototyping, or select the 2-piece pack for dual-axis builds or to keep a spare on hand — both options available across most variants.
| Belt Pitch | 5M (5 mm) |
|---|---|
| Tooth Count Range | 10 T, 12 T, 13 T, 14 T |
| Tooth Width Options | 11 mm / 16 mm / 21 mm (approx. 0.43" / 0.63" / 0.83") |
| Bore Diameter Options | 4 mm / 5 mm / 6 mm / 6.35 mm / 8 mm / 10 mm / 12 mm |
| Keyway Options | Without keyway / 3 mm keyway / 4 mm keyway (K-type) |
| Material | Aluminum alloy |
| Finish | Natural (silver) |
| Quantity per Pack | 1 pc or 2 pcs (see variant options) |
| Compatible Belt Type | 5M open-end or closed-loop timing belt |
| Weight | See variant options |
The tooth count determines your drive ratio. A 10-tooth pulley paired with a 20-tooth pulley gives a 2:1 reduction (more torque, less speed). For direct-drive or 1:1 setups, use matching tooth counts on both the motor and idler/driven shaft. For CNC routers and 3D printers, 10 T–14 T pulleys are common on the motor side when paired with longer-tooth driven pulleys or lead screws.
The tooth width must match your timing belt width. A 11 mm pulley is used with an 11 mm wide 5M belt, a 16 mm pulley with a 16 mm belt, and so on. Using a narrower pulley than your belt will cause the belt to overhang and wear unevenly. When in doubt, measure your existing belt width or check your machine's BOM.
For light-duty, low-torque, or unidirectional applications (such as most 3D printer axes), a set-screw bore without a keyway is typically sufficient. For higher-torque applications, reversing loads, or where positional accuracy is critical (CNC milling, plasma cutting), the K-type keyway provides a positive mechanical lock that prevents rotational slip even under shock loads.
NEMA 17 motors typically have a 5 mm output shaft — select the 5 mm bore variant. NEMA 23 motors commonly use 6.35 mm (1/4") or 8 mm shafts — select the matching bore. Always verify your motor's shaft diameter in its datasheet before ordering.
Aluminum alloy offers good natural oxidation resistance for indoor, dry environments typical of CNC workshops and electronics labs. For outdoor or high-humidity environments, consider applying a light coat of machine oil or selecting a pulley with an anodized finish. These pulleys are not rated for submersion or continuous exposure to corrosive chemicals.
No. These pulleys are designed specifically for the 5M trapezoidal tooth profile with a 5 mm pitch. GT2 belts use a 2 mm pitch curvilinear profile, and HTD belts use a rounded tooth profile — neither is interchangeable with 5M. Using mismatched belt-pulley profiles will cause skipping, accelerated wear, and loss of synchronization.
The quantity option lets you order either 1 pulley or a pack of 2 pulleys of the same specification. The 2-piece option is useful when building dual-axis machines (e.g., a CoreXY 3D printer or dual-motor gantry), or when you want to keep a spare on hand. The per-unit price is reflected in the listed variant price.
