Spec Clutch SN635 Stage 5 Full-Metallic Performance Clutch Kit

The Spec Clutch SN635 Stage 5 Clutch Kit is SPEC's top-tier single-disc performance clutch, engineered for drivers who demand maximum holding power in extreme street and race applications. Featuring a full-metallic sintered iron friction disc with the highest possible friction coefficient available in SPEC's lineup, this kit delivers uncompromising grip where OEM and entry-level performance clutches fall short. While technically street-drivable, the Stage 5 is purpose-built for high-demand performance use — not daily commuting.

The disc assembly uses a solid 12-rivet hub that eliminates the flex found in sprung-hub designs, and the entire assembly is heat-treated for exceptional strength and durability under sustained high-load conditions. A high-clamp pressure plate works in tandem with the full-metallic disc to ensure consistent engagement at the limits of performance driving. All SPEC clutch kits and flywheels are SFI approved.

Key Features:

• Full-metallic sintered iron friction disc — maximum friction coefficient
• High-clamp performance pressure plate for superior torque holding
• Solid 12-rivet hub and disc assembly — no flex, no slip
• Heat-treated assembly for strength and long-term durability
• Includes bearing and installation tool kit
• SFI approved clutch kit and flywheel

Recommended Driving Applications:

• Extreme street performance
• Drag racing
• Pulling
• Autocross

SPEC designs seven stages of single-disc clutches using advanced friction materials, and the Stage 5 represents the pinnacle of that lineup for single-disc applications. All SPEC products are designed, hand-built, and tested in the USA.