HTD Crankshaft Pulley 18 Tooth 1-1/8iID 1/8in Key

The Jones Racing Products HTD Crankshaft Pulley 18 Tooth 1-1/8" ID with 1/8" Keyway (part number CS-6102-A) is a precision-engineered serpentine drive component built for marine engine builders and performance builders who demand reliable power transmission. Machined from aluminum and finished in black anodize, this HTD pulley delivers the repeatable synchronization and minimal deflection that high-RPM marine engines require when running superchargers, alternators, and raw water pumps in integrated drive systems.

The 18-tooth HTD profile with 8mm pitch engages securely with standard HTD belt runs, maintaining belt tracking without slippage during load spikes common in marine service. The 1-1/8" ID mandrel accommodates standard crankshaft journals, while the 1/8" keyway provides positive rotational lock—critical when torque loads spike during engine acceleration or when running auxiliary systems under load. Aluminum construction keeps rotating mass minimal, reducing parasitic drag on the engine and improving throttle response. The 1-inch belt width is matched to typical mid-size HTD systems found in retrofitted and custom marine powerplants.

Engine builders installing modern serpentine belt drives on marine blocks—whether upgrading existing systems or assembling complete custom powerplants—rely on HTD crankshaft pulleys to anchor their drive geometry. This pulley suits applications from small-block V8 retrofits to larger displacement engines running multi-accessory configurations. Verification of crankshaft snout diameter and keyway dimensions against your specific engine block is essential before ordering. The black anodized finish resists corrosion in salt-air environments typical of coastal and offshore operations.

HTD drives have become industry standard in marine engine performance because the toothed belt profile eliminates the slippage and wear associated with V-belt systems. This allows builders to run smaller, lighter belt drives without sacrificing reliability—a key advantage when space and weight matter. Jones Racing Products' reputation for dimensional accuracy ensures this pulley will integrate seamlessly into matched HTD systems and maintain alignment over thousands of engine cycles.