ARP 200-6021 High Performance Connecting Rod Bolt Kit Chrome Moly - 8740

The ARP 200-6021 is a high-performance connecting rod bolt kit engineered from premium 8740 chrome moly steel. This 2-piece bolt set delivers the strength and reliability that professional engine builders and racers demand for high-stress applications. ARP's proprietary manufacturing process ensures these fasteners provide superior fatigue resistance and consistent clamping force under extreme conditions.

Premium Manufacturing Process:

• Forged in-house from aerospace-quality 8740 chrome moly steel
• Heat-treated using specialized vertical racks for complete 360-degree penetration
• Threads rolled after heat-treat to provide up to 10 times longer fatigue strength
• Precision CNC-machined to exacting specifications for perfect fitment
• Each bolt proudly stamped with the ARP name as assurance of quality

Wave-Loc Design Advantages:

• Wave-Loc surface contacts rod and cap for optimum alignment and stress reduction
• Provides secure interference fit (.001 to .005) despite varying factory tolerances
• Superior material grain flow compared to knurled bolts with stress risers
• Eliminates galling and scoring through smooth contact design
• Strengthens the connecting rod itself by reducing fluctuating stress

8740 Chrome Moly Material Properties:

8740 chrome moly is a quench and temper steel heat-treated to deliver tensile strengths between 180,000 and 210,000 psi. This proven alloy offers excellent toughness and adequate fatigue properties for most racing applications. When threads are rolled after heat-treatment (standard ARP practice), 8740 provides reliable performance and represents the most cost-effective solution for high-performance engines.

Installation and Maintenance:

Critical: Monitor bolt stretch regularly and replace any bolt that has permanently elongated by .0005 inches or more. This inspection practice ensures continued reliability and prevents catastrophic failure. Proper lubrication and torque specifications are essential for achieving optimal clamping force and fastener longevity.

ARP connecting rod bolts are trusted by leading rod manufacturers as original equipment and deliver up to ten times the fatigue strength of competitor fasteners. Whether you're building a street performance engine or a dedicated race motor, ARP 200-6021 bolts provide the reliability and safety margin your build demands.