ARP 7/16"-14 x 3.250 12pt black oxide bolts (643-3250) G37 RWD Thread Pitch - 1/2"-13 (31

Thread Pitch - 1/2"-13 (31

Manufacturer's Part Number: P1-P2-6

Part Number: AF574-03D

Part Number: MSD5527

ARP 7/16"-14 x 3.250 12pt black oxide bolts (643-3250) G37 RWD Thread Pitch - 1/2"-13 (31ARP 7 16" 14 x 3. 250 12pt black oxide bolts (643 3250) ARP Chromoly Bolts 643 3250 Now you can use premium quality ARP chromoly bolts to install most anything on a car, boat, or trailer. These specially heat treated 8740 chromoly fasteners feature a black oxide finish. They're nominally rated at 180,000 psi tensile strength to provide a substantial extra margin of safety over Grade 8 hardware. The bolts are available in a wide range of thread sizes,