Carrillo SCR4851-4 Pro-SA Forged Steel Connecting Rod

The Pro-SA beam design occupies the middle ground in Carrillo's rod lineup — offering a thicker, reinforced beam profile compared to the standard Pro-A rod, while remaining lighter than the Pro-H I-beam design. This balance makes the SCR4851-4 an excellent choice for turbocharged, supercharged, and nitrous-assisted builds that demand both strength and reduced rotating mass.

Key Features:

• Pro-SA Super A-Beam Design — increased beam thickness handles higher load capacities than standard A-beam rods while reducing rotating mass versus H-beam rods
• Proprietary Carrilloy Steel — forged from a chrome, nickel, molybdenum, vanadium alloy meeting all VAR (vacuum arc re-melt) ASTM standards for exceptional strength and fatigue resistance
• Oversized Forging Process — ensures proper grain flow and eliminates surface inclusions generated during the forging process for consistent strength and reliability
• Full-Floating Wrist Pin — bushed small end supports a full-floating wrist pin configuration for smooth operation under high load
• WMC Rod Bolt — equipped with Carrillo's precision-engineered WMC fasteners, jointly designed with leading fastener specialists and featuring a patented asymmetrical thread design for maximum clamp load and fatigue life
• Shot-Peened Finish — final shot peen operation relieves tensile stresses and imparts beneficial compressive stresses to extend fatigue life
• 100% Magnaflux Inspected — each rod is magnafluxed at least twice during manufacturing and Rockwell tested to validate the heat treat procedure
• CNC Machined with Probe Validation — all critical CNC operations are verified with precision probing to ensure dimensional integrity
• Laser-Etched Job Number — each rod receives a lasered job number for full traceability

Manufactured in the USA, Carrillo connecting rods are trusted at the highest levels of motorsport — from drag racing and road racing to endurance and forced-induction street builds. The SCR4851-4 delivers race-proven performance, rigorous quality control, and the precision tolerances that Carrillo has been known for across nearly five decades of connecting rod manufacturing.