ARP 134-6004 Connecting Rod Bolt Kit High Performance Chrome Moly - 8740

The ARP 134-6004 is a complete high-performance connecting rod bolt kit manufactured from 8740 chrome moly steel. ARP rod bolts are the industry standard for strength and reliability, chosen by leading connecting rod manufacturers as original equipment and trusted by racers worldwide who understand that the bolt is the critical weak link in any connecting rod assembly.

Why ARP Rod Bolts Are Superior:

Testing has demonstrated that ARP rod bolts deliver ten times the fatigue strength of competing fasteners. This exceptional durability comes from ARP's proprietary manufacturing process and quality control standards. Each bolt is forged in-house from premium materials, heat-treated using specialized vertical racks for complete 360-degree penetration, and features threads rolled after heat-treat to maximize fatigue life. Every bolt is precision CNC-machined to exacting specifications and proudly stamped with the ARP name as your assurance of quality.

8740 Chrome Moly Material:

The 8740 chrome moly alloy provides excellent toughness with adequate fatigue properties for most racing applications. This quench and temper steel delivers tensile strengths between 180,000 and 210,000 psi, making it the most cost-effective solution when bolt strength properly matches anticipated loads plus a safety margin. While modern super-alloys offer higher strength ratings, 8740 chrome moly represents the optimal balance of performance and value for the majority of high-performance engine builds.

Key Features:

• Forged in-house at ARP facilities using premium quality materials
• Heat-treated with vertical racks ensuring complete 360-degree penetration
• Threads rolled after heat-treat providing up to 10 times longer fatigue strength
• Precision CNC-machined to exacting specifications
• Complete kit with all necessary fasteners
• Each bolt stamped with ARP name for quality assurance

Wave-Loc Technology (where applicable):

• Wave-Loc surface contacts rod and cap for optimum alignment and stress reduction
• Provides interference fit of .001 to .005 inch for OEM connecting rods
• Superior material grain flow compared to knurled bolts with stress risers
• Eliminates galling and scoring through smooth contact surface
• Accommodates wide range of factory rod bolt hole tolerances

Important Maintenance Note:

Monitor bolt stretch regularly and replace any bolt that has permanently elongated by .0005 inch to ensure continued reliability and safety.