Bolt Kit 7.25in 3 Disc

The Quarter Master Bolt Kit 7.25in 3 Disc (part number 309507) is a precision clutch assembly component engineered for high-performance manual transmission systems. This 7.25-inch, three-disc configuration is designed for import performance and racing applications where reliable torque transfer and consistent engagement are critical to drivetrain durability. Quarter Master clutch kits are OEM-grade components trusted in both street and track environments where transmission reliability directly impacts vehicle performance and safety.

The 7.25-inch disc diameter on this three-disc configuration provides optimized surface area for clutch engagement while maintaining compatibility with import transmission housings. Weighing 0.38 lbs with compact dimensions of 1.9 x 1.05 x 4 inches, this kit integrates seamlessly into factory and aftermarket transmission assemblies. The three-disc design distributes clamping force across multiple friction surfaces, reducing pressure plate wear and extending clutch lifespan under demanding driving conditions. This geometry is specifically calibrated for the Optimum-RR clutch system and import performance applications where thermal stability and repeatable bite point are essential.

Technicians, restoration shops, and performance builders working with import vehicles rely on Quarter Master clutch kits when rebuilding or upgrading transmission systems. Whether servicing a worn original clutch or installing a higher-performance assembly, this bolt kit provides the precision fitment required for smooth shifts and predictable engagement across a range of driving intensities. OEM-spec clutch hardware ensures compatibility with factory bell housings and pressure plates while maintaining the exacting tolerances necessary for modern transmission operation.

Quarter Master is recognized in the transmission aftermarket as a manufacturer of high-specification clutch components used in performance applications and OEM service work. This bolt kit is part of their broader Optimum-RR import clutch lineup, which serves builders who demand consistent quality and reliable engagement characteristics across diverse driving scenarios and vehicle platforms.