Spec Clutch SZ135 Stage 5 Performance Clutch Kit - Full-Metallic

The Spec Clutch SZ135 Stage 5 Clutch Kit represents the pinnacle of SPEC's single-disc clutch lineup, engineered for drivers who demand maximum torque transfer and uncompromising grip. Featuring a full-metallic friction disc with the highest possible friction coefficient, this kit is technically street-drivable but is purpose-built for extreme performance applications where engagement feel takes a back seat to raw capability.

The disc assembly uses a solid 12-rivet hub construction, and the entire assembly undergoes heat treatment for superior strength and long-term durability under sustained high-load conditions. A high-clamp pressure plate ensures consistent and reliable clamping force even under extreme thermal and mechanical stress.

Key Features:

• Full-metallic friction material for maximum friction coefficient and torque capacity
• High-clamp pressure plate for consistent, reliable clamping force
• Solid 12-rivet hub and disc assembly for high-torque applications
• Heat-treated assembly for enhanced strength and durability
• Includes bearing and tool kit for complete installation
• Designed, hand-built, and tested in the U.S.A.

Recommended Driving Environments: Extreme Street, Drag Racing, Pulling, Autocross

The Stage 5 is SPEC's most aggressive single-disc offering — ideal for builds prioritizing maximum power transfer over everyday drivability. All SPEC clutch kits and flywheels carry SFI approval, reflecting the brand's commitment to safety and performance standards.