ARP 144-6021 High Performance Chrome Moly Connecting Rod Bolts - 8740 2-Piece Kit

The ARP 144-6021 connecting rod bolt kit delivers professional-grade reliability with ARP's legendary 8740 chrome moly construction. This 2-piece high performance rod bolt set provides the strength and fatigue resistance that racers and engine builders trust for demanding applications.

Why ARP Rod Bolts Are Superior

ARP rod bolts are engineered to outlast and outperform the competition, with testing demonstrating up to 10 times the fatigue strength of competing fasteners. The weak link in any connecting rod has always been the bolt, and ARP has earned its reputation by eliminating that weakness. Major connecting rod manufacturers choose ARP bolts as original equipment because they represent the gold standard in rod bolt technology.

8740 Chrome Moly Material

The 8740 chrome moly alloy is a quench and temper steel heat-treated to deliver tensile strengths between 180,000 and 210,000 psi. While considered moderate strength by today's exotic alloy standards, 8740 chrome moly offers excellent toughness and adequate fatigue properties for most racing applications, making it the most cost-effective solution for engines where bolt strength appropriately matches anticipated loads with a proper safety margin.

Key Features:

• Forged in-house at ARP using premium quality materials
• Heat-treated on special vertical racks to ensure complete 360-degree penetration
• Threads rolled after heat-treat for up to 10 times longer fatigue life
• Precision CNC-machined to exacting tolerances
• Each bolt proudly stamped with the ARP name as your assurance of quality
• Application-specific design optimized for reliability

Wave-Loc Technology (Where Applicable)

Select ARP rod bolts feature patented Wave-Loc surface design that contacts the rod and cap for optimal alignment while reducing fluctuating stress. This innovative design provides interference fit of .001 to .005 inches despite wide factory tolerances, delivers superior material grain flow compared to knurled designs, and virtually eliminates galling and scoring through smooth contact surfaces.

Installation and Maintenance

It is critically important to monitor bolt stretch and replace any bolt that has permanently elongated by .0005 inches. Proper installation procedures and torque specifications should always be followed for optimal performance and longevity.