Carrillo SC7176-4 Pro-Series CARR Rod Bolts

Designed as a direct-fit fastener for compatible Carrillo rod applications, these bolts deliver the precision clamping load and fatigue resistance that serious engine builders demand.

Key Features:

• CARR-Series (MP35N / S-Grade) Material: Manufactured from a premium multiphase alloy with an ultimate tensile strength (UTS) of 285,000 psi — significantly stronger than standard WMC H11 tool steel bolts rated at 220,000 psi
• Asymmetrical Thread Design: Each thread profile is slightly different from the previous, providing evenly distributed thread engagement for increased clamp load and improved fatigue life of the fastener
• Unlimited Torque Cycles: CARR bolts are rated for an indefinite number of torque cycles when the stretch method is followed for installation and the bolt is not overheated or over-yielded
• Stretch-Method Installation: CP-Carrillo's preferred installation method uses bolt stretch rather than torque alone, ensuring accurate and repeatable preload regardless of lubrication variables
• Traceability: Head markings indicate bolt series and lot number for identification and quality validation

CP-Carrillo CARR-series rod bolts are the preferred fastener choice for engines that will see sustained high-RPM operation above 8,500 rpm, forced induction, or repeated rebuild cycles. Always install using CP-Carrillo's specified molybdenum-based assembly lubricant and verify stretch values against the specification card supplied with your connecting rods.