Carrillo M5039 Connecting Rod Bolt High-Performance Racing Fastener

The Carrillo M5039 is a genuine CP-Carrillo replacement connecting rod bolt engineered for high-performance and racing engine applications. CP-Carrillo offers connecting rod fasteners in two distinct material grades: the WMC (H11 tool steel) bolt rated at 220,000 PSI ultimate tensile strength, and the CARR (Multiphase alloy) bolt rated at 285,000 PSI — providing a clear upgrade path for the most demanding builds.

Key Features:

• Asymmetrical thread design for evenly distributed thread engagement, improving clamp load and fastener fatigue life
• Engineered to a known yield load — designed so the yield threshold is never reached during proper linear stretch installation
• Stretch-method installation recommended for consistent, accurate clamping force across every assembly
• WMC (H11 tool steel) bolts rated for approximately 15–18 torque cycles
• CARR (Multiphase) bolts rated for indefinite torque cycles when stretch method is followed and bolt is not overheated or overstretched
• Serial number engraved on each bolt for material identification and traceability
• Manufactured to exacting tolerances consistent with CP-Carrillo's motorsport-proven quality standards

CP-Carrillo connecting rod bolts are race-proven fasteners trusted by professional engine builders across drag racing, road racing, and off-road competition. Proper lubrication under the bolt head and on the threads is required during installation. Always consult the torque and stretch specification card included with your Carrillo connecting rods for the correct installation values for this fastener.