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When a 5M timing belt system loses tension or runs misaligned, the entire drive train suffers — skipped teeth, premature belt wear, and costly downtime follow. Engineers, CNC builders, and automation integrators who need a dependable 5M timing belt idler drive pulley with flexible bore and slot width options will find this 18-tooth pulley a practical, drop-in solution.
This idler pulley is available in two styles — smooth (without teeth) for pure tensioning duty and toothed (with teeth, 18T) for driven or guided belt contact. The body is machined from aluminum alloy with a natural or anodized finish. Slot widths span 11 mm, 16 mm, 21 mm, and 27 mm (approx. 0.43 in, 0.63 in, 0.83 in, and 1.06 in) to match standard 5M belt widths. Bore sizes range from 5 mm to 15 mm (approx. 0.20 in to 0.59 in) to suit common shaft diameters.
Typical applications include CNC router and laser cutter belt tensioning, industrial conveyor drive systems requiring a 5M idler pulley with adjustable bore, and compact automation machinery where a toothed or smooth idler pulley for 5M pitch belt is needed to maintain consistent belt path geometry.
| Belt Pitch | 5M (5 mm pitch) |
|---|---|
| Tooth Count | 18T (toothed style) / Smooth (without teeth style) |
| Slot Width | 11 mm / 16 mm / 21 mm / 27 mm (see variant options) |
| Bore Size | 5 / 6 / 7 / 8 / 10 / 12 / 15 mm (see variant options) |
| Material | Aluminum alloy |
| Finish | See variant options |
| Outer Diameter | See variant options |
| Flange | See variant options |
| Weight | See variant options |
| Application | CNC, conveyor, automation, laser cutter belt drives |
The Without Teeth (smooth) style is used as a pure idler or tensioner — the belt rides on the smooth outer surface, typically on the back (non-toothed) side of the belt. The With Teeth (18T) style meshes with the belt's tooth profile and is used where the pulley needs to positively guide or drive the belt on its toothed face.
The slot width should match your belt's width. For example, if you are using a 15 mm wide 5M belt, select the 16 mm slot width for a snug fit with minimal lateral play. Refer to your belt's datasheet for the exact width and choose the nearest slot width option (11 / 16 / 21 / 27 mm).
Measure your shaft diameter precisely with a caliper and select the matching bore size. Available bores are 5, 6, 7, 8, 10, 12, and 15 mm. If your shaft uses a keyway or set screw, confirm the pulley hub depth is sufficient for your fastening method before ordering.
Yes — this pulley is designed for the standard 5M pitch (5 mm tooth pitch) timing belt profile used across CNC routers, laser cutters, conveyor systems, and general automation equipment. Verify that your belt's width matches the selected slot width variant.
Aluminum alloy pulleys are well-suited for light-to-medium duty continuous operation in CNC and automation environments. For heavy-load or high-temperature industrial applications where steel is specified, please contact us to confirm suitability before ordering.
Aluminum naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor environments. For humid, wet, or outdoor installations, an anodized finish variant (where available) offers improved surface protection. Contact us to confirm finish options for your specific environment.
The smooth (Without Teeth) style is intended for tensioning and back-side belt contact only — it should not be used as a primary drive pulley. The toothed (With Teeth, 18T) style can function as a secondary drive or guided pulley where positive belt engagement is required.
