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These ARP chromoly bolts are specified as 1/4-20 x 4.125 hex-head fasteners finished in black oxide. Intended for fabrication and assembly uses, the description provides thread size, length, hex head form and black oxide finish as the defining attributes. The listing presents them as replacement or upgrade hardware for applications that call for those exact dimensions.
ARP 1/4-20 X 4.125 Hex Black Oxide Bolts
