ARP RB26 Head Stud Kit


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ARP RB26 Head Stud Kit

Automotive Racing Products (ARP) are the leading brand in fastener technology. All fasteners are made with the highest quality materials with quality assurance testing.

ARP manufactures fasteners from a wide assortment of materials ranging from popular stainless steel and 8740 chrome moly to exotic alloys that have been developed to handle space travel.

ARP RB26 Head Stud Kit Options

ARP RB26 Head Studs are available in 12mm or 1/2″ stud sizes. Please note that 12mm is a direct factory drop-in replacement and 1/2″ studs require machining. RB20 & RB25 Head Studs are factory 11mm and thus are not interchangeable with RB26.

Three different materials are also available: premium grade 8740 Chrome Moly, ARP2000® or Custom Age 625+ (CA625+). Every kit includes hardened parallel washers for an even load distribution and accurate torque readings.

  • 12mm ARP2000®: Factory drop-in replacement RB26 head stud that suits RB26 only (Part Number: 202-4207)
  • 12mm CA625+: Factory drop-in replacement RB26 head stud that suits RB26 only (Part Number: 202-4208)
  • 1/2″ 8740 Chrome Moly: Requires machining to suit RB20, RB25, RB26 & DOHC RB30 (Part Number: 999-4209)
  • 1/2″ CA625+: Requires machining to suit RB20, RB25, RB26 & DOHC RB30 (Part Number: 999-4209-CA)

Please note: Lead times may apply for 1/2″ ARP RB26 Head Studs.

ARP RB26 Head Stud Kit Materials

  • 8740 Chrome Moly: Until the development of today’s modern alloys, chrome moly was popularly considered a high strength material. Now viewed as only moderate strength, 8740 chrome moly is seen as a good tough steel, with adequate fatigue properties for most racing applications, but only if the threads are rolled after heat-treatment, as is the standard ARP production practice. Typically, chrome moly is classified as a quench and temper steel, that can be heat-treated to deliver tensile strengths between 180,000 and 210,000 psi.
  • ARP2000®: ARP2000 is an alloy steel that can be safely heat treated to a higher level, producing a greater strength material than 8740. While 8740 and ARP2000 share similar characteristics – ARP2000 is capable of achieving a clamp load at 220,000 psi. ARP2000 is used widely in short track and drag racing as an up-grade from 8740 chrome moly in both steel and aluminum rods. Stress corrosion and hydrogen embrittlement are typically not a problem, providing care is taken during installation.
  • Custom Age 625 Plus®: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness – with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Best of all it is less expensive and expected to soon replace MP-35 as the material of choice in the high strength, super-alloy field. Typical tensile strength is 260,000-280,000 psi.

Want to talk to us?

At Street Race Solutions, we utilise ARP RB26 Head Stud Kits in all of our RB26 engine builds. If you have any question relating to ARP Head Studs or RB engine components, please call us on 07 4602 3858!


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