ARP Forged Connecting Rod Bolts - 3/8" x 38mm

ARP forged connecting rod bolts, head diameter 3/8" (9.5 mm) x length 38 mm. Worldwide reference for fasteners in motorsport and high performance engine building applications.

Technical specifications

• Manufacturer: ARP (Automotive Racing Products)
• Origin: Made in USA (Santa Paula and Ventura, California)
• Type: Hot-forged connecting rod bolt
• Head diameter: 3/8" (9.525 mm)
• Length: 38 mm
• Manufacturer certifications: ISO 9001 and AS9100

ARP bolts are forged from high strength materials, machined on precision CNC centers and individually heat treated. Each bolt is inspected to ensure compliance with ARP's aerospace specifications.

Available grades

• ARP 8740: 8740 chromoly steel, tensile strength 200,000 psi (1379 MPa). Standard for street and moderate performance applications.
• ARP 2000: molybdenum-vanadium steel, tensile strength 220,000 psi (1517 MPa). Recommended for high performance, drag and road race applications.
• ARP L19: special treated L19 alloy, tensile strength 260,000 psi (1793 MPa). For extreme Pro Stock and Top Fuel applications.
• ARP Custom Age 625+: nickel-based superalloy, minimum tensile strength 260,000 psi (1793 MPa). Excellent corrosion resistance, for the most demanding applications.

Available packaging (depending on grade)

• Single (1 bolt) - for individual replacement
• Set of 2 - for 1 complete connecting rod
• Set of 8 - for complete 4-cylinder engine
• Set of 16 - for complete V8 engine

Important: these bolts are compatible with Boostline, Manley and ARP connecting rods depending on the part number selected. Always verify compatibility with your connecting rod before ordering. Use exclusively with ARP Ultra-Torque lubricant (part 100-9904) to ensure correct preload. Use of an ARP stretch gauge is strongly recommended.