ARP 145-2503 Square Drive Harmonic Balancer Bolt - Kit

ARP's 145-2503 Square Drive Harmonic Balancer Bolt is engineered to withstand the extreme forces generated as the crankshaft flexes and twists during engine operation. This ultra-strong bolt is rated at 200,000 psi tensile strength, allowing maximum clamping force to keep the harmonic balancer securely locked in position.

Key Features:

• Integrated 1/2-inch square drive forged into the bolt head, enabling engine rotation with any standard 1/2-inch drive ratchet or breaker bar
• Constructed from heat-treated 8740 chrome moly steel for superior strength and durability
• 200,000 psi tensile strength rating ensures maximum clamping force
• Extra tall 12-point head accepts deep sockets and eliminates risk of stripping
• Includes 1/4-inch thick wide area washer for optimal load distribution
• Heavy-duty black oxide finish for corrosion resistance

This specialized balancer bolt simplifies engine assembly and service work by eliminating the need for separate tools to rotate the crankshaft assembly. The square drive feature allows technicians to precisely position the engine during timing procedures, valve adjustments, or other work requiring controlled rotation.