Spec Clutch SB305 Stage 5 Full-Metallic Clutch Kit

The SPEC SB305 Stage 5 Clutch Kit represents SPEC's most aggressive single-disc clutch offering, engineered for heavily modified drag race and pulling applications that demand maximum torque capacity and near-instant engagement. This is a race-grade clutch system designed for competitors who need uncompromising grip over street comfort.

Key Features:

• Full-metallic friction disc with the highest available friction coefficient for maximum torque transfer
• Solid 12-rivet hub construction for unsprung, rigid disc engagement
• Heat-treated disc assembly for superior strength and long-term durability under extreme conditions
• High-clamp pressure plate delivers maximum clamping force for high-horsepower applications
• Compatible with OE dual mass flywheels on applicable configurations
• Kit includes: High-clamp pressure plate, full-metallic rigid iron disc assembly, throwout bearing, and installation tool kit

Intended Use: Drag racing and tractor/truck pulling. The Stage 5's rigid iron disc engages instantly and aggressively — it is not recommended for street use due to harsh, unforgiving engagement characteristics. Drivers stepping up to this clutch should be experienced with race-oriented clutch systems.

SPEC offers seven stages of single-disc clutch performance, with the Stage 5 sitting at the top for maximum-effort race builds. Custom configurations are available — contact a SPEC technical specialist to ensure the correct setup for your specific engine output and intended use.