Spec Clutch SD855A Stage 5 Full-Metallic Performance Clutch Kit

The SPEC SD855A Stage 5 Clutch Kit is a race-grade, full-metallic clutch kit engineered for maximum torque capacity and aggressive performance applications. As SPEC's top-tier single-disc offering, the Stage 5 is purpose-built for extreme street use, drag racing, pulling, and autocross — delivering the highest possible friction coefficient available in SPEC's single-disc lineup.

Key Features:

• Full-metallic friction disc with the highest available friction co-efficient for maximum torque transfer
• High-clamp pressure plate engineered to handle extreme power demands
• Solid 12-rivet hub and disc assembly for superior strength and rigidity
• Heat-treated components for long-term durability under race conditions
• Billet steel flywheel included in the kit
• Bearing and tool kit included

Performance Notes: The Stage 5 is street-drivable but not street-friendly — this is a race-oriented clutch recommended for dedicated performance and competition builds. SPEC classifies Stages 4 and 5 as race-only applications. All SPEC clutch kits and flywheels are SFI approved.

Installation Notes: Must be used with a SPEC flywheel. If reusing an existing flywheel, the surface must be resurfaced prior to installation. A minimum 450-mile break-in period is required before full-throttle engagement, drag launching, or speed shifting.