HTD-5M Timing Belt 20mm Wide | 175mm–3750mm Perimeter | Rubber Closed Loop Drive Belt

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, where C is center distance and D1/D2 are the pitch diameters of your pulleys. For a quick reference, 1 inch ≈ 25.4mm — so a 250mm belt is approximately 9.8". When in doubt, size up slightly; a belt that's too short cannot be installed, while a longer belt can typically be tensioned with an idler or adjustable mount.

This belt uses the HTD (High Torque Drive) 5M profile, meaning teeth are spaced 5mm apart center-to-center. The HTD tooth shape is rounded and curvilinear — unlike the sharp trapezoidal teeth on older MXL or XL belts — which generally distributes load more evenly and reduces the risk of tooth jump under high torque.

Load capacity depends on the number of teeth in mesh, operating speed, and pulley diameter. For a 20mm-wide HTD-5M belt, tangential force ratings are typically in the range of 100–400 N depending on conditions. For precise load calculations specific to your drive system, consult your pulley manufacturer's data or contact us to confirm suitability before ordering.

This rubber timing belt generally handles occasional moisture exposure well. However, prolonged submersion, direct UV exposure, or contact with petroleum-based oils and solvents may degrade the rubber compound over time. For harsh outdoor, chemical, or high-UV environments, a polyurethane (PU) HTD-5M belt is typically a more durable choice. Contact us to confirm material specifications for your specific environment.

Yes. This belt follows the standard HTD-5M tooth profile and 5mm pitch, making it compatible with any HTD-5M pulley regardless of brand — including common aluminum pulleys used in 3D printers, CNC machines, and robotics kits. Ensure your pulley's tooth count and pitch diameter correspond to the belt perimeter listed in the variant name you select.

Each variant is labeled in the format HTD-5M [X]Teeth [Y]mm. For example, "HTD-5M 60Teeth 300mm" means 60 teeth and a 300mm (≈11.8") closed-loop perimeter. You can verify: Teeth × Pitch = Perimeter (60 × 5mm = 300mm). Match the tooth count to your pulley's tooth count and confirm the perimeter fits your drive's center distance requirements.

HTD-5M has a 5mm pitch with a rounded curvilinear tooth profile, optimized for higher torque capacity. GT2 (Gates Tooth 2mm) has a 2mm pitch and is common in 3D printers where fine positioning resolution matters more than torque. XL belts use a trapezoidal tooth profile with a 5.08mm pitch and are generally found in older or lighter-duty drives. HTD-5M is typically chosen when torque capacity and positive engagement are the priority over ultra-fine resolution.