ARP's Pro Series Rod Bolts are substantially better than the stock OEM and most aftermarket bolts, used in a variety of applications from rebuilt stock motors to highly modified powerplants in circle track, marine and drag racing engines – including those with superchargers and/or nitrous oxide injection systems. For the most severe applications, ARP has developed the Pro Series Wave-Loc rod bolts. These ultra heavy-duty rod bolts are made from a special material - ARP2000, which has approximately 200% the fatigue life of 8740 chrome moly steel. The tensile strength of the pro series is 220,000 psi and is capable of more than 12,000 lbs. clamping force. Also featured is Wave-Loc design, which contacts the rod and cap for optimum alignment and reduction of fluctuating stress. Wave-Loc provides a snug fit with superior grain flow, virtually eliminating galling or scoring of the rod.