Harmonic Balancer Bolt Ford 289-460 Except 351

The PRW Industries Harmonic Balancer Bolt for Ford 289–460 engines (excluding 351) is a critical fastener engineered to maintain crankshaft balance under high RPM loads. This 5/8-18 thread bolt measures 2.05 inches in length with a 12-point head design, constructed from steel and finished in black oxide for corrosion resistance. For engine builders, hot rod enthusiasts, and mechanics performing crankshaft service or harmonic balancer replacement, this OEM-specification fastener ensures secure retention and vibration dampening integrity.

The 12-point head geometry provides superior grip characteristics during installation and removal, reducing fastener slippage and bolt stripping compared to 6-point designs. Black oxide coating offers baseline corrosion protection suitable for street and mild performance applications, though marine or salt-air environments may require additional protection. The 5/8-inch diameter and specific thread pitch (18 TPI) are engineered to match OEM specifications for these Ford engine families, ensuring proper clamping force and harmonic balancer concentricity without risk of under-tightening or over-torque damage.

This fastener is essential for any engine rebuild or maintenance procedure involving harmonic balancer removal on early-generation big-block Ford platforms. Whether executing a complete bottom-end rebuild, replacing a failing damper, or performing preventive crankshaft inspection, proper fastener selection prevents costly vibration issues and crankshaft damage. The bolt is sold individually, so confirm your application requires only one replacement or order multiples as needed for your project inventory.

PRW Industries manufactures this component to OEM standards, making it a reliable choice for restoration work, performance engine builds, and field repairs where fastener integrity directly impacts engine reliability and longevity.