Long (1-3/8in) Crank Key

The Long (1-3/8in) Crank Key by MR. GASKET is an essential fastening component designed for engine builders, performance enthusiasts, and professional mechanics who demand precision in crankshaft assembly. This specialized key secures the harmonic balancer and crankshaft pulley to prevent unwanted rotation during high-RPM operation, making it indispensable for engine rebuilds, stroker installations, and high-performance modifications.

Manufactured to exacting tolerances, MR. GASKET's crank key fits snugly within the crankshaft keyway, preventing lateral movement of the balancer under acceleration and engine braking loads. The extended 1-3/8-inch length provides positive engagement across a wider surface area compared to standard keys, distributing shear stress more evenly and reducing the likelihood of key failure in high-horsepower applications. This design is particularly critical in forced-induction engines, big-block builds, and street/strip combinations where crankshaft harmonics and pulsation loads are significantly elevated.

This crank key is compatible with most small-block and big-block engines that utilize keyed crankshaft pulleys, making it a universal choice for Chevrolet, Ford, and Mopar platforms. Installation is straightforward—simply insert the key into the crankshaft keyway to secure the harmonic balancer and crankshaft pulley effectively.