1/2-20 x 5.250 hex black oxide bolts

1/2-20 x 5.250 hex black oxide boltsMaterial: 8740 Chrome Moly Finish: Black Material 2: Finish 2: Origin: USA

Studs are manufactured with a unique nut-starter nose that helps prevent cross-threading

For openers

To be used with ARP’s patented Perma-Loc™ adjusters

ARP Pro Series head bolt kits are application specific and designed to deliver superior strength typically associated with competition engines

High Performance head bolts are available with a reduced wrenching hex or 12-point and wide area flanged head that eliminates theneed for valve train removal to facilitate cylinder head retorquing

The parts are CNC machined from solid aluminum billet (6061) or 1018 mild steel

L19 is a very high strength material compared to 8740 and ARP2000 and is capable of delivering a clamp load at 260

These premium grade bolts are engineered to properly engage the manifold threads and resist loosening

Studs are preferred by many Pro engine builders because they eliminate the chance of pinching gaskets and contribute to easier engine assembly

All Pro Series head bolts have areduced wrenching hex or 12-point head and wide area flange to permit the use of larger diameter valve springs and eliminate the need for valve train removal during cylinder head retorquing

Developed for racers who leave nothing to chance

these hex nuts are available in most sizes to meet your needs