ARP 135-6421 Wave-Loc Connecting Rod Bolt Kit Chrome Moly - 8740

The ARP 135-6421 is a high-performance connecting rod bolt kit featuring ARP's patented Wave-Loc design and premium 8740 chrome moly construction. This 2-piece bolt kit represents the industry standard for connecting rod fasteners, trusted by rod manufacturers and racers worldwide for uncompromising reliability and strength.

Wave-Loc Technology Advantages:

• Patented Wave-Loc surface contacts rod and cap for optimal alignment and reduced fluctuating stress
• Provides interference fit of .001 to .005 inches, accommodating wide range of OEM rod bolt hole tolerances
• Superior material grain flow compared to knurled bolts that create stress risers
• Eliminates galling and scoring with smooth contact surface
• Strengthens the connecting rod itself by improving clamping characteristics

ARP Manufacturing Excellence:

• Forged in-house from premium 8740 chrome moly steel
• Heat-treated using vertical racks for complete 360-degree penetration
• Threads rolled after heat-treat for up to 10 times greater fatigue strength
• Precision CNC-machined to exacting tolerances
• ARP name stamped on each bolt as assurance of quality

8740 Chrome Moly Material:

ARP's 8740 chrome moly is a quench and temper steel delivering tensile strengths between 180,000 and 210,000 psi. This material offers excellent toughness and adequate fatigue properties for most racing applications, making it a cost-effective solution when bolt strength properly matches anticipated loads with appropriate safety margin.

Critical Maintenance Note:

Monitor bolt stretch regularly and replace when permanently elongated by .0005 inches. Proper maintenance ensures continued reliability and performance.

Testing demonstrates ARP rod bolts deliver ten times the fatigue strength of competing fasteners, making them the trusted choice for connecting rod reliability across all levels of performance and racing applications.