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ARP chromoly 5/16-18 x 2.250 bolts with a 12-point head and black oxide finish are presented as automotive fasteners for applications requiring that size and head style. The overview normalizes the catalog naming into a clear shopper-facing identity. These bolts are listed with their exact thread size, length, head configuration, and finish so buyers can confirm fitment where 12-point fasteners and a black oxide coating are specified.
ARP 5/16-18 x 2.250 12pt Black Oxide Bolts
