ARP 133-6021 High Performance Chrome Moly Connecting Rod Bolt Kit - 8740

The ARP 133-6021 is a high-performance connecting rod bolt kit featuring ARP's renowned 8740 chrome moly construction. This 2-piece bolt set delivers the reliability and strength that has made ARP the standard choice for connecting rod manufacturers worldwide.

Why ARP Rod Bolts Are Superior:

The connecting rod bolt has always been the weak link in any connecting rod assembly. ARP rod bolts have been proven through extensive testing to deliver ten times the fatigue strength of competing fasteners. Each bolt is forged in-house using only the finest quality materials and undergoes ARP's rigorous manufacturing process to ensure maximum reliability under extreme loads.

Key Features:

• Forged in-house at ARP using premium quality materials
• Heat-treated using special 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
• 8740 chrome moly steel with tensile strength between 180,000 and 210,000 psi
• Each bolt proudly stamped with the ARP name as assurance of quality

About 8740 Chrome Moly Material:

8740 chrome moly is a tough, quench and temper steel with excellent fatigue properties for most racing applications. When threads are rolled after heat-treatment (standard ARP practice), this material provides adequate strength for demanding performance environments while remaining cost-effective for budget-conscious builds.

Installation Note:

It is critically important to monitor the stretch of each bolt and replace it when it has permanently elongated by .0005 inches to maintain optimal reliability and safety.