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ARP 5/16-24 x 1.625 12‑point black oxide chromoly bolts are listed for uses needing a 1.625" length with 5/16-24 threading and a 12‑point head style. The item description identifies the bolts as chromoly with a black oxide finish at the specified length. These bolts are intended to match applications that call for that exact thread size, length, and 12‑point seating geometry.
ARP 5/16-24 X 1.625 12pt black oxide bolts
