Carrillo BMR4200-030 BMW Pro-H Forged H-Beam Connecting Rod

The Carrillo BMR4200-030 is a precision-forged, high-performance connecting rod engineered for BMW engines demanding superior strength and reliability. Built in the USA, this rod is manufactured from Carrillo's proprietary "Carrilloy" steel — a chrome, nickel, molybdenum, and vanadium alloy that meets all VAR (Vacuum Arc Re-Melt) ASTM standards — delivering an impressive ultimate tensile strength (UTS) of 195,000 psi with a yield of 182,000 psi.

Key Features:

• Proprietary Carrilloy Forged Steel — Chrome-nickel-moly-vanadium alloy for maximum strength and fatigue resistance
• Oversized Forging Process — Ensures proper grain flow and eliminates surface inclusions for consistent structural integrity
• Lightweight H-Beam Design — Reduces reciprocating mass compared to stock rods for improved throttle response and higher RPM capability
• Precision CNC Machined — All critical dimensions validated with on-machine probing for tight tolerances and weight matching
• Dual Magnaflux Inspection — Each rod is magnaflux tested at least twice during production, plus Rockwell hardness tested to verify heat treatment
• Shot-Peened Finish — Final shot peen operation improves surface fatigue resistance
• WMC Rod Bolt Included — High-quality H-11 tool steel WMC fastener (220,000 UTS) with Carrillo's patented asymmetrical thread design for superior clamp load and fatigue life
• CARR Bolt Upgrade Available — Optional MP35N CARR bolt (285,000 UTS) for extreme RPM and all-out racing applications
• Sold Individually — Order the quantity needed for your build

Carrillo connecting rods are the benchmark choice for professional racers and performance engine builders worldwide. The BMR4200-030 is designed to withstand the most demanding street performance and racing applications, providing the reliability and precision required for high-boost, high-RPM BMW builds.