Fluidampr Engine Harmonic Balancer Bolt

Why the Right Bolt Kit Matters for Your Fluidampr Installation

Installing a performance harmonic damper is only as reliable as the hardware holding it in place. Fluidampr — the industry-recognized pioneer in viscous crankshaft damper technology since the mid-1980s — understands this better than anyone. That's why the brand engineered a dedicated line of Engine Harmonic Balancer Bolts specifically designed to complement their high-performance dampers and stand up to the extreme loads generated by modified diesel and gas engines.

Fluidampr Bolt Kit Tiers: Matched to Your Power Level

Fluidampr offers bolt kits in two distinct tiers to match the demands of your specific build. For street-driven and moderate performance applications, their High Strength Installation Kit (such as part #300007) is recommended for 2003–2018 5.9L / 6.7L Cummins applications up to 700 hp / 1,250 ft-lbs torque for secure damper mounting. Similar kits are available for 6.6L Duramax and 6.0L / 6.4L / 6.7L Power Stroke applications at the same power threshold.

For builders pushing past those limits, Fluidampr offers the Full Power Bolt Kit (part #300008). This kit delivers the most holding power of any bolt kit Fluidampr offers for Cummins performance builds above 700 hp / 1,250 ft-lbs torque, and is highly recommended for drag racing and sled pulling.

Premium Hardware at the Core

What sets Fluidampr bolt kits apart is the quality of hardware inside. Each kit features heat-treated, high-strength extended-length bolts from ARP® and a .010" thick diamond-impregnated friction washer. The ARP partnership ensures the fasteners meet the kind of load ratings that high-output diesel builds demand. For the Full Power Kit, Fluidampr takes it a step further: a ½"-thick torque plate with a textured finish mounts between the damper face and bolts to provide a wider and stronger clamping surface, and the torque plate incorporates a 5/8" hex head for barring the engine over — with heat-treated, extended-length ARP® bolts and a diamond-impregnated friction washer for the ultimate in holding power.

Standard Installation Kits for Cummins applications use 8740 chromoly hardware with a black oxide finish, rated up to 700 HP / 1,250 lb-ft torque. Comparable chromoly kits are also available for the 6.0L Power Stroke with the same 8740 chromoly, black oxide specification.

The Fluidampr Ecosystem: Bolt Kits as Part of a Complete Solution

Fluidampr bolt kits are engineered to work hand-in-hand with Fluidampr's viscous damper technology. Trusted by champion engine builders and major OEMs, Fluidampr designs each component in its installation system to ensure the damper stays securely seated under the precise operating conditions its viscous silicone technology was built to handle. Leading OEMs also trust Fluidampr and its parent company Vibratech TVD because of their ISO 9001:2015 certified quality standards and proven experience in professional motorsports since 1985.

Whether you're building a weekend sled puller, a daily-driven performance diesel, or a dedicated drag race truck, choosing the correct Fluidampr bolt kit ensures the precision-engineered damper stays exactly where it belongs — locked tight to the crankshaft snout and ready to protect your rotating assembly at every RPM.