ARP 104-6004 Wave-Loc Connecting Rod Bolt Kit Chrome Moly - 8740

The ARP 104-6004 is a complete connecting rod bolt kit featuring high-performance Wave-Loc technology and 8740 chrome moly construction. Engineered to eliminate the weak link in connecting rod assemblies, these precision-manufactured fasteners deliver exceptional reliability for demanding racing and performance applications.

Wave-Loc Technology Benefits:

• Patented Wave-Loc surface design contacts rod and cap for optimum alignment and reduced fluctuating stress
• Provides interference fit range of .001" to .005" for snug installation on OEM connecting rods despite factory tolerance variations
• Superior material grain flow compared to knurled bolts that create stress risers
• Smooth contact surface virtually eliminates galling and scoring of rod material
• Strengthens the connecting rod itself through improved stress distribution

Manufacturing Excellence:

• Forged in-house from premium 8740 chrome moly steel with tensile strength of 180,000-210,000 PSI
• Heat-treated using specialized vertical racks for complete 360-degree penetration
• Threads rolled after heat-treatment to provide up to 10 times greater fatigue strength
• Precision CNC-machined to exacting specifications
• ARP name stamped on each bolt as assurance of quality

About 8740 Chrome Moly Material:

8740 chrome moly is a proven quench and temper steel offering excellent toughness and adequate fatigue properties for most racing applications. When threads are rolled after heat-treatment following ARP's standard production practice, this material delivers reliable performance at a cost-effective price point. It represents the ideal balance of strength and value for engines where bolt loads from piston/rod weight and rotational speeds fall within the material's capability range.

Important Service Note:

Monitor bolt stretch during use and replace any bolt that has permanently elongated by .0005" to maintain optimal connecting rod reliability and safety.