Spec Clutch SD855 Stage 5 Full-Metallic Performance Clutch Kit

The Spec Clutch SD855 Stage 5 Clutch Kit is a race-grade clutch system engineered for extreme performance applications. Built around a full-metallic sintered iron disc delivering the highest possible friction coefficient, this kit is purpose-built for drag racing, pulling competitions, and other high-demand motorsport environments where maximum torque transfer is critical.

Key Features:

• Full-metallic friction disc with maximum friction coefficient for aggressive torque transfer
• High-clamp pressure plate for maximum clamping force under race conditions
• Solid 12-rivet hub with full-faced, unsprung disc assembly for direct, immediate engagement
• Heat-treated disc assembly for enhanced strength and long-term durability under sustained race loads
• SFI-approved design meets sanctioning body safety standards
• Includes bearing and tool kit for complete installation

The Stage 5 is SPEC's most aggressive single-disc clutch offering, recommended for race-only use. The rigid iron disc assembly and high-clamp pressure plate deliver uncompromising engagement characteristics suited to heavily modified drag and pulling engines. Not recommended for street use — harsh pedal effort and aggressive engagement behavior make this kit unsuitable for daily driving. Stages 1–3+ are recommended for street/strip applications; Stages 4–5 are race-only.

Due to the performance-specific nature of this product, custom configurations are available. Consult a SPEC technical representative with details about your build and intended use to ensure proper fitment and setup.