Carrillo CR5225-8 8mm CARR Connecting Rod Bolt

The Carrillo CR5225-8 is a replacement connecting rod bolt from CP-Carrillo, one of the most trusted names in high-performance engine fasteners. Designed as an 8mm CARR-series rod bolt, this fastener is built to the exacting standards that have made Carrillo the preferred choice of professional engine builders and racers worldwide.

Key Features:

• CARR-Series Multiphase Material (MP35N): Rated at 285,000 psi ultimate tensile strength — significantly stronger than standard H-11 tool steel WMC bolts at 220,000 psi UTS
• Asymmetrical Thread Design: Carrillo's patented thread geometry distributes load evenly across thread engagement, increasing clamp load and improving fatigue life
• Unlimited Torque Cycles: CARR bolts are rated for an indefinite number of torque cycles when the proper bolt-stretch installation method is followed and the bolt is not over-yielded or overheated
• 8mm Thread Diameter: Compatible with Carrillo connecting rods specifying an 8mm CARR fastener
• Precision Quality Control: Each fastener lot is sample-tested destructively for ultimate tensile strength and fatigue compliance
• Sold Individually: Typically two bolts are required per connecting rod

CP-Carrillo recommends installation via the bolt-stretch method rather than torque-only for maximum preload accuracy. Always lubricate threads and the underside of the bolt head with the supplied Carrillo molybdenum-based assembly paste prior to installation. Refer to the specification card included with your connecting rod set for the correct stretch value for your application.

Note: CARR bolts can be identified by serial numbers beginning with "S" on the bolt head. These replacement fasteners are available individually so you can maintain your Carrillo rod set without replacing entire rods.