BBC Damper Bolt Kit 1/2-20 1.550 UHL

The BBC Damper Bolt Kit 1/2-20 1.550 UHL from Optitorque Technologies LLC is a precision harmonic balancer fastener engineered for big block Chevy engine applications. This 1/2-20 thread fastener measures 1.550 inches in length and features a 5/8-inch 12-point head, delivering the exact clamping geometry required for critical crankshaft balance assembly on high-performance and stock BBC powerplants. Constructed from hardened steel with black oxide coating, this bolt resists corrosion and provides reliable long-term performance in engine compartment environments.

The 1/2-20 thread pitch and 1.550-inch under-head length (UHL) specification ensure proper seating against the harmonic balancer hub without bottoming or creating preload inconsistencies. The 12-point head design allows precise engagement with metric or standard socket tools, critical when torque specifications demand consistent fastening force on balancer-to-crankshaft assemblies. Black oxide finish provides baseline corrosion resistance suitable for engine bay temperatures and moisture exposure over extended ownership cycles.

This fastener addresses the needs of BBC engine rebuilders, performance shops, and off-road enthusiasts who require OEM-specification replacement parts for crankshaft balancer installation. Whether rebuilding a marine big block, diesel conversion, or conventional automotive big block, the BBC damper bolt kit delivers the dimensional accuracy and material integrity demanded by engine assembly protocols. Sold as a single unit, this fastener is essential inventory for any shop servicing big block Chevy platforms.

Big block Chevy fasteners have remained largely unchanged across production generations, making this bolt compatible with most BBC engine variants from 1958 onward. Optitorque Technologies LLC focuses on precision fastener solutions for OEM and performance engine applications, ensuring dimensional and material consistency across their product line.