ARP 260-4704 Custom Age 625+ Head Stud Kit for 2002-2021 Subaru WRX/STI

Vehicle Fitment

• 2002-2021 Subaru WRX (EJ20/EJ25)
• 2004-2021 Subaru STI (EJ257)
• 2009-2012 Subaru Legacy GT (EJ255)
• 2004-2013 Subaru Forester XT (EJ255/EJ257)
• 2004-2006 Subaru Baja Turbo (EJ255)

Features

• Manufactured from ARP's Custom Age 625+ super-alloy
• Nominal tensile strength of 260,000-280,000 psi
• Centerless ground for precision and consistency
• Heat-treated prior to thread rolling and machining
• Rolled threads after heat treatment for increased fatigue resistance
• Includes 12 studs, 12 parallel-ground washers, and 12 12-point nuts
• Designed for high-boost and high-horsepower applications
• Resistant to atmospheric corrosion and oxidation

Specifications

• Material: Custom Age 625+ super-alloy
• Tensile Strength: 260,000-280,000 psi
• Socket Sizes: 9/16" 12-point, 3/16" Allen
• Finish: Black oxide coating for corrosion resistance
• Includes: 12 studs, 12 washers, 12 nuts, and assembly lubricant

Included Components

• 12x Custom Age 625+ head studs
• 12x Parallel-ground washers
• 12x 12-point nuts (8740 chrome moly steel)
• 1x Ultra-Torque fastener assembly lubricant

Product Description

The ARP 260-4704 Custom Age 625+ Head Stud Kit is engineered for Subaru's EJ series DOHC engines, including the EJ20, EJ25, and EJ257. These studs are ideal for applications requiring enhanced clamping force, such as high-boost or high-horsepower builds. The studs are manufactured from ARP's Custom Age 625+ super-alloy, offering a nominal tensile strength of 260,000-280,000 psi.

Designed to withstand the demands of performance engines, the studs are centerless ground for precision and consistency. They undergo heat treatment prior to thread rolling and machining, with rolled threads after heat treatment to increase fatigue resistance. The kit includes 12 studs, 12 parallel-ground washers, 12 12-point nuts, and an assembly lubricant, providing everything needed for installation.

Whether you're building a high-performance engine or replacing worn-out factory bolts, the ARP 260-4704 Head Stud Kit delivers the quality and performance you need to keep your engine running smoothly.