ARP 135-2503 Square Drive Harmonic Balancer Bolt - Kit

ARP's 135-2503 Square Drive Balancer Bolt is engineered to handle the extreme kinetic energy absorbed by harmonic balancers 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 ensure the balancer remains locked in position under the most demanding conditions.

Key Features:

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

This specialized balancer bolt combines the security of ARP's legendary fastener technology with the convenience of a built-in square drive, making it an ideal choice for engine builders and performance enthusiasts who need both reliability and functionality.