Spec Clutch SJ635 Stage 5 Clutch Kit Full-Metallic High-Torque

The Spec Clutch SJ635 Stage 5 Clutch Kit delivers maximum clamping force and the highest available friction coefficient in the Spec clutch lineup. Engineered for drivers who demand extreme performance, this kit features a full-metallic disc that is technically street-drivable but optimized for high-output racing applications. The solid 12-rivet hub and heat-treated disc assembly provide the structural integrity needed to withstand sustained high-torque and high-heat environments found in drag racing and competitive motorsport.

Key Features:

• High clamp pressure plate for maximum torque holding capacity
• Full-metallic friction material with the highest possible friction coefficient
• Solid 12-rivet hub and disc assembly — heat treated for superior strength and durability
• Includes bearing and installation tool kit for complete installation

Ideal Applications:

• Extreme street performance
• Drag racing
• Pulling competitions
• Autocross

The Spec Stage 5 represents the pinnacle of Spec's clutch performance hierarchy. Its full-metallic disc does generate increased pedal effort and engagement chatter compared to street-oriented stages, making it best suited for dedicated performance builds where outright grip and durability under abuse take priority over daily-driving comfort.