S5M Timing Belt 15mm Wide – 250mm to 2800mm | 5mm Pitch Closed Loop Drive Belt for CNC & Stepper Motors

Measure the center-to-center distance between your two pulleys, then use the standard belt length formula: Belt Length ≈ 2 × C + π × (D1 + D2) / 2. For a closed-loop belt, the listed length is the inner circumference. For example, a 500mm belt (100 teeth × 5mm pitch) has an inner circumference of approximately 19.7". When in doubt, size up — a slightly longer belt can generally be tensioned; a belt that is too short cannot be installed.

S5M is a curvilinear-tooth (round-root) synchronous belt profile with a 5mm pitch. Compared to the trapezoidal T5 profile, S5M typically offers lower backlash and quieter operation. HTD 5M also has a 5mm pitch but uses a deeper, more rounded tooth — the two are not interchangeable. Always match the belt profile to your pulley groove profile before ordering.

Load capacity depends on belt width, length, pulley diameter, and operating speed. A 15mm-wide S5M belt generally handles light-to-medium duty applications — typically suitable for CNC axis drives, 3D printer extruder carriages, and stepper motor transmissions running at moderate speeds. For exact rated tensile strength, contact us to confirm with the manufacturer's datasheet.

This belt is generally made from neoprene rubber with fiberglass cord reinforcement, which offers reasonable resistance to moisture and mild temperature variation. However, prolonged exposure to UV, ozone, oils, or extreme heat (above approximately 80°C / 176°F) can degrade the rubber compound over time. For outdoor or harsh-environment use, contact us to confirm material specifications before ordering.

Yes — as long as your pulleys are designed for the S5M profile (5mm pitch, curvilinear tooth form) and accept a 15mm belt width, this belt should be compatible. Verify the pulley's tooth profile and belt-width groove before ordering. S5M pulleys are widely used in CNC routers, laser cutters, and precision linear motion systems.

Each size listed is the belt's inner circumference. Choose the size that matches your drive system's required belt path. If your machine's tensioner has an adjustment range, you can often accommodate one or two adjacent sizes. When two sizes seem close, check your tensioner's travel range — if it can take up 10–20mm of slack, either size may work. In general, select the size closest to your calculated belt length.

S5M belts are commonly used in CNC routers and industrial motion systems. Many consumer 3D printers and desktop laser engravers use GT2 (2mm pitch) or T5 belts instead. Check your machine's pulley profile and pitch before ordering. If your machine uses S5M pulleys, this belt is a direct fit.