HTD3M Closed Loop Timing Belt 801–999mm | PU Steel Wire Reinforced | 10–30mm Wide

Measure the center-to-center distance between your two pulleys, then use the formula: Perimeter ≈ 2 × C-to-C distance + (π × pulley pitch diameter). For example, a 300mm center distance with two 30-tooth HTD3M pulleys typically yields a belt in the 900mm range. Always verify against your machine's spec sheet or CAD model. Our belts run from 801mm (≈31.5″) to 999mm (≈39.3″) in 3mm steps — if your calculated value falls between sizes, generally round up to the next available size and adjust your tensioner.

Width directly affects load capacity and stiffness. As a general guide: 10mm is typically sufficient for light-duty 3D printer axis drives and small laser engravers; 15–20mm suits mid-range CNC routers and robotic joints with moderate torque; 30mm is generally used for heavy-duty linear motion systems or high-torque applications where belt flex under load must be minimized. Match the width to your pulley's belt groove width.

The steel wire tensile cord provides significantly higher break strength than fiberglass-reinforced PU belts of the same width. Exact rated tensile load varies by width and operating speed. These belts are generally suitable for light-to-medium duty maker and light industrial applications. For specific load ratings relevant to your design, contact us with your application details.

Polyurethane generally outperforms neoprene rubber in resistance to oils, mild chemicals, and moderate humidity. PU belts are commonly used in light industrial settings where lubricant splash is present. For outdoor use, prolonged UV exposure can degrade PU over time — shielding the belt from direct sunlight is recommended. Operating temperature is typically –20°C to +80°C; confirm with us if your application runs outside this range.

Yes. This belt conforms to the HTD3M profile standard (3mm pitch, rounded tooth geometry), which is a widely adopted open standard. It is compatible with HTD3M pulleys from any manufacturer. Important: HTD3M is not interchangeable with GT2 (2mm pitch), T5 (5mm pitch), or other profiles — verify your pulley's pitch before ordering.

The 801–999mm perimeter range is commonly found in: FDM 3D printer X/Y gantry systems (Ender-style, CoreXY, and similar), desktop CNC router feed axes, diode laser engraver carriages, robotic arm joints, automated camera sliders, and custom DIY linear actuators. The closed-loop format is preferred in these applications because it eliminates the belt-end clamp hardware required by open-ended belts.

Divide the mm value by 25.4. Quick reference examples: 801mm ÷ 25.4 ≈ 31.5″ | 900mm ÷ 25.4 ≈ 35.4″ | 999mm ÷ 25.4 ≈ 39.3″. All variant options in the selector above show both the perimeter in mm and the corresponding tooth count (perimeter ÷ 3mm = teeth).