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ARP 5/16-24 x 2.125 12‑point black oxide chromoly bolts are specified at a 2.125" length with 5/16-24 thread and a 12‑point head. The listing identifies chromoly material and black oxide finish at the given length. These bolts are intended to be used when that precise thread size, length, and 12‑point head configuration are required for proper assembly fit and seating.
ARP 5/16-24 X 2.125 12pt black oxide bolts
