Mopar Flexplate Bolt Kit - 5.7/6.1L Hemi

The ARP Mopar Flexplate Bolt Kit for 5.7/6.1L Hemi engines is a precision-engineered Pro Series fastener set designed to secure flexplate-to-crankshaft assemblies with maximum reliability under high-torque conditions. Built from chromoly steel with black oxide coating, this 8-piece kit delivers the material strength and corrosion resistance demanded in high-performance and modified Hemi applications where standard fasteners fall short.

Each bolt measures 10mm diameter with 1.00mm thread pitch and 0.700-inch length, featuring a 12-point head geometry that enables precision torque application using standard 12-point sockets and wrenches. The chromoly construction provides superior tensile strength compared to standard steel, critical for applications experiencing sustained high RPM, forced induction, or aggressive torque multiplication from transmission converters. Black oxide finish provides baseline corrosion resistance suitable for engine bay environments, though builders working in high-humidity or marine climates should consider additional protective measures.

This kit is engineered for 5.7-liter and 6.1-liter Hemi platforms, including applications in Dodge, Chrysler, and Mopar performance vehicles. Builders upgrading to higher-stall converters, heavy-duty transmissions, or forced-induction systems rely on premium flexplate fasteners to prevent fastener stretch or failure under increased load. The Pro Series designation indicates ARP's commitment to thread quality and dimensional consistency—critical factors when establishing repeatable torque specs and preventing micro-movement at the crankshaft interface.

ARP fasteners are manufactured to strict specifications and widely recognized in the performance automotive and racing community for reliability. Installation requires proper torque wrench technique and adherence to manufacturer torque specifications for your specific Hemi platform to ensure even load distribution and prevent flexplate runout. This kit comes complete with all eight fasteners needed for a full flexplate assembly—no additional fasteners required.