Rocker Arm Jam Nut - 7/16-20 12pt.

The T AND D MACHINE Rocker Arm Jam Nut - 7/16-20 12pt. is a precision fastener designed for small-block engine builders and performance machine shops that require precise rocker arm adjustments. This component is essential for ensuring the reliability and performance of valve train assemblies.

Constructed from steel, this jam nut features a black oxide finish that provides corrosion resistance and reliable holding power on rocker arm adjuster studs. The 12-point head design allows for multiple engagement angles, which minimizes the risk of rounding corners during installation and adjustment cycles.

Engine builders performing initial valve train setups, tuning rocker arm geometry, or replacing worn adjuster hardware will find this jam nut indispensable. It is compatible with small-block Chevrolet, Ford, and similar platforms, making it a versatile choice for various engine builds.