ARP's Pro Series Head Studs are made with heat-treated and thread-rolled 8740 material with an incredible 200,000 PSI tensile strength rating for better load distribution. They also come with ARP's unique 12-point nuts and hardened parallel washers, giving you the improved torque reading.
ARP Fastners - 230-4201 - Features
Proprietary ARP 2000 Material
Broached Stud Ends Install & Make Cylinder Head Removal Easier
Rated At 220,000 Psi Tensile Strength
Heat-Treated Prior To Thread Rolling And Machining For Optimum Fatigue Strength
Includes Chrome Moly Steel 12-Point Nuts
Shot-Peened To Remove Any Surface Irregularities And Upgrade The Overall External Integrity
Black Oxide Coating For Improved Corrosion Resistance
Hardened Parallel Ground Washers For An Even Load Distribution And More Accurate Torque Readings
Centerless Ground To Ensure They Are Perfectly Concentric
Comes With 0.5oz Of ARP Fastener Assembly Lubricant
Improved Clamping Force Prevents Cylinder Heads From Lifting
