Carrillo SCR4621-4 Pro-H 3/8" WMC Bolt Forged Connecting Rod Set

Built using Carrillo's proprietary Carrilloy steel — a chrome, nickel, molybdenum, and vanadium alloy meeting all VAR (Vacuum Arc Re-Melt) ASTM standards — these rods deliver an exceptional combination of tensile strength, ductility, and fatigue resistance demanded by serious engine builders.

Each rod in this set is manufactured from an oversized forging to ensure proper grain flow and eliminate potential surface inclusions generated during the forging process. The heat treat process produces a UTS of 195,000 psi with a yield of 182,000 psi, while preserving low notch-sensitivity and ductility critical for sustained high-RPM operation.

Key Features:

• Equipped with 3/8" WMC (H-11 steel) rod bolts — re-torqueable and designed for demanding race use
• Proprietary Carrilloy chrome/nickel/moly/vanadium alloy steel — VAR ASTM certified
• Laser-etched job number on each rod for full traceability
• 100% Magnaflux inspected (magnetic particle tested twice per rod)
• Rockwell hardness tested on every piece to validate heat treat
• Set-balanced to ±1 gram for smooth, precise operation
• Fully CNC-machined with probing validation for dimensional integrity
• Shot-peened to relieve tensile stresses and improve fatigue life
• Tapered H-beam profile allows weight savings on the reciprocating end and increased clearance for fully-boxed pistons
• Made in the USA

Includes assembly lube.