Steel Crank Hub - SBC .005 Undersize

The Steel Crank Hub - SBC .005 Undersize by ATI Performance is a precision-engineered crankshaft component designed for small-block Chevrolet (SBC) engine builders and high-performance enthusiasts. This undersize hub accommodates stroker or custom crank applications where standard sizing doesn't align with your build specifications. Whether you're assembling a street engine, race motor, or restoration project, this hub ensures proper crankshaft damper fitment and reliable harmonic balancer retention without compromise.

Manufactured from durable steel construction, the Steel Crank Hub provides the structural integrity required for consistent engine operation across RPM ranges. The .005-inch undersize specification allows compatibility with custom or modified crankshaft journals, critical when running specialty cranks or working within tight tolerances during engine rebuilds. ATI Performance's engineering ensures concentricity and balance—essential qualities that prevent vibration and premature wear on ancillary components like water pumps, alternators, and power steering systems. The compact dimensions (5.3 x 4.6 x 5.4 inches) and lightweight design (2.65 lbs) make installation straightforward without adding unnecessary rotational mass.

Mechanics and engine builders working on SBC platforms—from 265 to 400 cubic inches—will appreciate this component's precision fit for undersize journal applications. Installation requires careful alignment during crankshaft assembly, and proper balancing of the complete rotating assembly is mandatory before engine startup. This hub works seamlessly with standard SBC dampers and pulleys once correctly fitted, making it an essential upgrade for custom builds where off-the-shelf components no longer apply. Always verify crank journal diameter and damper compatibility before ordering to ensure a perfect fit for your specific engine configuration.