HTD 8M Timing Belt – 8mm Pitch 20mm Wide Closed Loop Synchronous Belt 264–992mm

Measure the center-to-center distance between your two pulleys, then calculate the required belt circumference: L = 2C + π(D1+D2)/2. Each variant lists the pitch length in mm — for example, 264mm (≈10.4") up to 992mm (≈39.1"). Match the pitch length to your calculated loop circumference. If your center distance is adjustable, generally size down to the nearest available length and tension accordingly. When in doubt, size up by one increment to give yourself adjustment room.

"8M" refers to the HTD (High Torque Drive) tooth profile with an 8mm pitch — the center-to-center distance between adjacent teeth. Your mating pulleys must be rated for HTD 8M profile with a 20mm belt width groove. HTD profiles are not interchangeable with GT2, GT3, or trapezoidal (MXL, XL, L) profiles, even if the pitch number appears similar. Mixing profiles will cause skipping or accelerated wear.

Load capacity depends on belt length, pulley diameter, operating speed, and wrap angle. HTD 8M belts with 20mm width are generally suited for moderate-to-high torque applications in light industrial machinery, CNC equipment, and automation drives. For safety-critical or high-cycle applications, consult your drive system's engineering specifications and apply an appropriate service factor. Contact us to confirm rated load data for this specific belt.

HTD rubber timing belts are typically constructed from neoprene or HNBR, which provides moderate resistance to moisture and mild petroleum-based oils. They are generally not recommended for prolonged direct UV exposure, immersion in harsh solvents, or high-temperature washdown environments. For outdoor installations, consider shielding the belt from direct sunlight. Contact us to confirm the exact compound and its chemical resistance ratings before use in demanding environments.

Yes — this belt follows the HTD 8M tooth profile standard and is compatible with any HTD 8M pulley machined to accept a 20mm wide belt. The HTD 8M profile is an industry-standard specification, so it will generally mesh correctly with pulleys from major suppliers (e.g., SDP/SI, Stock Drive Products, Misumi, and similar). Always verify the pulley's tooth profile designation before ordering.

If your drive has a fixed center distance, you need an exact pitch length match — use the formula above and select accordingly. If your center distance is adjustable (e.g., a motor on a slotted mount), in most cases it is better to choose the shorter belt and move the motor outward to tension it, rather than using a longer belt with a tensioner idler. Tensioner idlers add complexity and a potential failure point. A properly tensioned belt should deflect approximately 1/64" per inch of span under light finger pressure.

HTD 8M timing belts are generally constructed with a rubber body (neoprene or HNBR) reinforced with fiberglass or steel tension cords, and feature nylon-faced teeth for reduced friction and wear resistance. Contact us to confirm the exact material specification for this listing if your application has specific material compliance requirements (e.g., RoHS, food-grade).