Spec Clutch SF504-2 Stage 4 Clutch Kit - Solid Hub Carbon-Graphite

The SPEC SF504-2 Stage 4 Clutch Kit is a high-performance, solid hub clutch system built for drivers who demand maximum torque capacity and durability. A solid hub evolution of the Stage 3 design, the Stage 4 features an 8-rivet solid hub disc assembly that is heat treated for superior strength and long service life.

Available in 3, 4, or 6 puck configurations, the Stage 4 can be tailored to your specific driving needs. The 3-puck disc offers the lightest rotating mass, while the 6-puck provides the smoothest engagement of the three options. The 4-puck strikes a balanced compromise between the two. While the 6-puck configuration is street drivable, the rigid solid hub makes this clutch best suited for performance and competition use.

Key Features:

• High-clamp pressure plate for maximum torque holding capacity
• Carbon-graphite friction material for consistent performance under high heat
• Heat-treated solid 8-rivet hub and disc assembly for strength and durability
• Multiple puck configurations available — 3, 4, or 6 puck
• Includes bearing and installation tool kit

Ideal Applications:

• Drag Racing
• Road Racing
• Rally / Rallye
• Pulling
• Drift
• Autocross

The SPEC Stage 4 is engineered for competitors who need a clutch that can withstand the most demanding performance environments. Its solid hub design delivers uncompromising power transfer where every second — and every foot-pound of torque — counts.