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The ARP 5/16-18 black coarse hex nut kit includes coarse-thread hex nuts finished in black for 5/16-18 fasteners, intended as replacement hardware for engine and mechanical assemblies. These nuts provide straightforward thread engagement for routine maintenance and rebuilds, offering consistent fit with matched coarse-thread bolts. Keep them for dependable, easy replacement of original fasteners.
ARP 5/16-18 black coarse hex nut kit
