Earl's Performance Harmonic Balancer Bolts

Earl's Performance harmonic balancer bolts are precision-engineered fasteners built for professional engine builders and serious performance enthusiasts who demand reliable, long-lasting clamping force on critical rotating assembly components. Constructed from high-strength 4135 chrome moly steel with a 180,000 PSI tensile strength rating, these bolts are engineered to outlast and outperform standard OEM hardware across race, street performance, and high-output engine applications.

A defining advantage of the Earl's harmonic balancer bolt line is its fully reusable design. Unlike OEM torque-to-yield bolts — which are single-use items that must be discarded after removal — Earl's bolts can be reinstalled across multiple builds and service intervals without sacrificing clamping integrity. This reduces long-term cost and downtime for professional shops and home builders alike.

Each kit includes a matching extra-thick, large-diameter washer engineered to improve load distribution across the crankshaft snout, helping protect the balancer hub from concentrated clamping forces. The bolt's extra-tall 12-point head design delivers secure, positive socket engagement — minimizing the risk of rounding or slippage during installation and when using the bolt to rotate the engine during assembly. Both components feature a black oxide coating for corrosion resistance and a clean, professional finish.

Key Features:

• 4135 chrome moly steel construction for maximum strength, durability, and fatigue resistance
• 180,000 PSI tensile strength for reliable, consistent clamping under extreme rotating assembly loads
• Extra-tall 12-point head prevents socket slippage and rounding during installation and engine rotation
• Includes matching extra-thick, large-diameter washer for superior load distribution across the crankshaft snout
• Black oxide coating on bolt and washer for corrosion resistance and a professional finish
• Fully reusable — eliminates the cost and hassle of replacing torque-to-yield hardware after every service interval
• Rolled threads ensure maximum thread engagement and accurate torque readings
• Engineered for race, street performance, and high-output engine builds

Earl's Performance harmonic balancer bolts are available in multiple configurations to fit a wide range of popular engine applications. Select the correct variant for your specific engine from the options below.