DH Double Sided Tooth Timing Belt | Pitch 9.525mm | 25mm & 30mm Width | 46–340 Teeth

Match the belt perimeter to your center-to-center shaft distance plus the circumference of both pulleys. The DH series uses a 9.525mm (3/8") pitch, so tooth count = perimeter ÷ 9.525. For example, a 584.2mm (≈23") belt has 46 teeth. Always verify against your machine's OEM spec or measure the old belt directly. If converting from inches: 1" = 25.4mm.

A double sided (or twin-tooth) timing belt has teeth on both the inner and outer surfaces. This allows it to drive pulleys on both sides simultaneously, making it ideal for serpentine drives, counter-rotation systems, and multi-shaft machinery where a single belt must engage two or more shafts at once.

DH timing belts are generally rated for moderate-to-high torque transmission. Exact load capacity depends on belt width (25mm vs 30mm), tooth engagement, and pulley diameter. The 30mm wide variants typically offer greater tensile strength than the 25mm versions. Consult your drive system's torque requirements and compare against the belt's rated tensile load before installation.

DH timing belts are typically constructed from neoprene rubber, which provides reasonable resistance to moisture and mild temperature variation. However, prolonged exposure to UV radiation, petroleum-based oils, or harsh chemicals can degrade the belt over time. For outdoor or washdown environments, verify the specific material spec and consider adding a belt guard or cover.

DH belts use a 9.525mm (3/8") pitch and are compatible with standard DH-series timing pulleys designed for double-sided engagement. Ensure your pulley tooth profile matches the DH double-sided standard. Mixing with H-series (single-sided) pulleys on the back side is not recommended as the tooth geometry differs and can cause premature wear or skipping.

Choose belt width based on the power (torque) your drive system needs to transmit. A 30mm wide belt generally handles higher loads than a 25mm belt of the same length. If your machine originally used a specific width, match that width exactly — your pulley flanges are sized accordingly. When upgrading for higher torque capacity, stepping up to 30mm is a common approach, but verify your pulleys can accommodate the wider belt.

The pitch is 9.525mm (3/8"), which is the distance from one tooth center to the next. This must match your pulley's pitch exactly for proper meshing. Mismatched pitch will cause the belt to skip teeth, generate noise, and wear out prematurely. The DH designation confirms both the pitch and the double-sided tooth profile.

The model number encodes the tooth count and belt type. "230DH" means 230 teeth × 9.525mm pitch = 2190.75mm perimeter — however, in practice the number refers to the belt designation in the DH series catalog, not always a direct tooth count. The safest approach is to match the model number printed on your existing belt, or calculate from the perimeter listed in the variant options (e.g., 584.2mm = 230DH with 46 teeth).