HTD Belt 25.197in Long 30mm Wide

The HTD Belt 25.197in Long 30mm Wide (MPN 640-30 HD) from Jones Racing Products is a precision serpentine drive belt engineered for high-performance marine propulsion systems and auxiliary engine applications. HTD synchronous belt technology ensures positive power transfer without slippage, making this belt essential for dependable performance in demanding boating environments where accessory drive reliability directly impacts on-water safety and engine efficiency.

With a 25.197-inch circumference and 30mm width, this HTD belt accommodates standard marine alternator, water pump, and compressor pulley configurations. The 8mm pitch spacing ensures positive tooth engagement across the belt's service life, resisting the salt air corrosion and thermal cycling that challenge standard rubber belts in coastal and offshore boating conditions. Jones Racing Products manufactures this belt to precision specifications, maintaining tight tolerances that prevent premature wear and slippage during high-RPM auxiliary loads. The compact 0.28 lb weight allows straightforward installation without requiring auxiliary tensioning systems on properly configured serpentine drive setups.

Recreational anglers and commercial boat operators alike depend on HTD synchronous belts for auxiliary engine systems serving refrigeration, hydraulic winches, air conditioning compressors, and charging systems. This 25.197in HTD belt fits common single-alternator and dual-pulley configurations found in inboard and outboard marine engines. Replacement intervals depend on operating hours and environmental exposure, but HTD belts typically outlast conventional V-belts by 40–60% in marine service. Verify fitment with your engine's original serpentine diagram before ordering, as similar dimensions exist across multiple marine platforms.