DogBone Harmonic Balancer Bolt DogBone-HBB-063 | 2001-2025 Duramax 6.6L LB7, LLY, LBZ, LMM, LML, L5P

DogBone by UnderDog Diesel – Harmonic Balancer Bolt

Replace your OE balancer bolt with this premium 8740 chromoly upgrade from DogBone by UnderDog Diesel. Engineered for strength and precision, this balancer bolt is designed to work perfectly with stock, ATI, and Fluidampr balancers.

Built using the same high-strength alloy as DogBone’s proven head studs, this bolt delivers tensile strength exceeding 220,000 psi, ensuring uncompromised durability and performance under the most demanding conditions.

Each bolt’s threads are rolled after heat treatment, a process that enhances thread integrity and minimizes fatigue over time—offering superior clamping strength and long-term reliability. Precision-engineered to match the exact length, size, and weight required for your application, this bolt is the ideal replacement for your factory fastener.

Note: Harmonic Balancer Bolt Torque Spec – 250 ft-lbs