BMC Flywheel Bolt Kit

The ARP BMC Flywheel Bolt Kit (Pro Series) is engineered for BMW 4-cylinder engine builders and performance technicians who demand precision fastening where it matters most. Flywheel bolts are critical stress components that secure the engine's rotational mass to the crankshaft; failure under load results in catastrophic engine damage. This six-piece kit replaces OEM fasteners with superior chromoly construction, ensuring reliable clamping force during high-RPM operation and extreme torque events. Whether rebuilding a track engine, tuning a street performance build, or servicing factory equipment, the BMC kit delivers the fastener integrity that separates a reliable powerplant from a costly failure.

Each bolt features a 3/8-24 inch thread pitch with a 0.900 inch length and 12-point head design for secure wrench engagement and repeatable torque application. The chromoly steel construction provides superior tensile strength and fatigue resistance compared to standard fasteners, critical when fasteners experience cyclic loading at high engine speeds. Black oxide finish offers corrosion resistance in underhood environments while aiding visibility during installation and future service intervals. The 12-point head geometry distributes clamping force evenly across the flywheel friction surface, minimizing stress concentration and preventing bolt stretch or galling during assembly and disassembly cycles.

This kit is essential for BMW M50, M52, M54, and related 4-cylinder engine platforms where OEM fasteners have aged, corroded, or fatigued. Technicians rebuilding engines, upgrading to performance flywheels, or performing clutch service will appreciate the precision fit and guaranteed clamp load retention. Installation requires application of ARP assembly lube per manufacturer torque specifications; proper fastening technique ensures repeatability and prevents premature wear. The complete six-bolt set eliminates mismatched hardware and guarantees all fasteners meet identical strength and dimensional standards for balanced, vibration-free operation.