ARP Bolts World-leading Fastener Technology ARP started applying technology to race fastener design and manufacturing in 1968. We'll discuss five components of fastener technology in detail. Design Today's critical diesel fasteners - head studs and bolts, main studs and bolts, and driveline - have been designed stronger than ever before to handle the extreme loads. As a results, installation pre-loads - the amount the fastener is stretched during installation - are very high. To overcome head gasket failures that can occur in 6.0 Powerstroke diesel engines employed in truck and RV applications, industry leader ARP has introduced extra heavy-duty head studs for the popular Ford Powerstroke · These ARP studs are rated at 220,000 psi tensile strength, and provide the clamping force required to keep cylinder heads from lifting due to higher combustion pressures. · The studs are manufactured in ARP's Santa Paula, CA plant from proprietary ARP 2000 material, with threads rolled after heat-treat to provide optimum fatigue strength. · They are centerless ground to assure perfect concentricity · The ends of the studs are broached to facilitate easy installation. This feature also enables the cylinder head to be removed in tight quarters. · Also included in each kit are heat-treated, chrome-moly steel 12-point nuts and parallel-ground washers. They are black oxide finished for extreme durability.
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