200,000 psi Tensile Strength Harmonic Balancer Bolt

The ARP Harmonic Balancer Bolt is engineered as a superior replacement for the OEM crankshaft bolt found on GM LS and LT engine platforms. This ensures greater reliability and service life, especially in performance applications where the harmonic balancer absorbs significant energy from crankshaft flex. Constructed from black oxide coated 8740 chromoly steel, this bolt boasts an impressive tensile strength of 200,000 psi, significantly exceeding OEM specifications. The design includes a 12-point head that readily accepts a deep socket, mitigating the risk of stripping the head during installation or removal. It WILL NOT FIT dry-sump LS engines. The M16 x 2.0 thread pitch ensures compatibility with the intended applications. This part replaces the GM part number 12557840.