ARP Main Studs Bolt Kit - Scion FR-S 2013-2016 / Subaru BRZ 2013+ / Toyota 86 2017+

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ARP Pro Series main bolts are application-specific and rated at 190,000 psi. Designed for use in competition engines, as well as to meet the exacting standards and demands of professional engine builders, ARP bolts are forged from 8740 chromoly steel and feature a reduced wrenching head, large underhead radius, and rolled threads for the utmost in reliability. The threads are rolled after heat-treating which gives them about 2,000 percent better fatigue strength than most main bolts that are threaded prior to heat-treating. Hardened parallel-ground washers are included with each kit.

  • Made using premium grade 8740 alloy materials that deliver superior fatigue cycle life
  • Each stud is placed vertically in special racks
  • Heat treated to 200,000 psi
  • Thread-rolled to provide 1000% better fatigue strength
  • Resistance to atmospheric corrosion and oxidation
  • Includes (10) head studs (long)
  • Includes (4) short studs
  • Includes (10) washers
  • includes (1) ARP Ultra-Torque fastener assembly lubricant
  • Socket Size(s) 12mm 12pt, 10mm 12pt


  • 2013-2020 Subaru BRZ
  • 2013-2016 Scion FR-S
  • 2017-2019 Toyota 86