Spec Clutch SS235-2 Stage 5 Full-Metallic Performance Clutch Kit

The Spec Clutch SS235-2 Stage 5 Clutch Kit is a race-focused performance clutch designed for drivers who demand maximum torque capacity and friction performance. Featuring a full-metallic sintered iron disc with the highest available friction coefficient, this kit delivers uncompromising grip and holding power for extreme performance applications. While technically street-drivable, this is a purpose-built race clutch and is not recommended for daily street use.

The disc assembly uses a solid 12-rivet unsprung hub that eliminates flex under high-load conditions, and the entire assembly is heat-treated for enhanced strength and long-term durability under race conditions. The kit includes a high-clamp pressure plate engineered to match the aggressive friction material, ensuring consistent and reliable clamping force.

Key Features:

• Full-metallic (sintered iron) friction disc — maximum friction coefficient for extreme torque loads
• High-clamp performance pressure plate — engineered to complement full-metallic disc material
• Solid 12-rivet unsprung hub — rigid, high-torque disc assembly with no rotational flex
• Heat-treated assembly — improved strength and thermal durability under sustained race use
• Bearing and tool kit included — select models (see application notes)
• SFI approved — every Spec clutch kit and flywheel meets SFI certification standards
• Non-ratcheting design for use only with Spec billet flywheels (application-dependent)

Recommended Driving Applications:

• Drag Racing
• Extreme Street Performance
• Pulling
• Autocross

The Stage 5 is Spec Clutch's most aggressive single-disc offering and sits at the top of their single-disc performance lineup. For best results, this kit should be paired with a compatible Spec billet flywheel. Stages 4 and 5 are recommended for race-only use.