Spec Clutch SB051 Stage Performance Clutch Kit - 1

The Spec Clutch SB051 Stage 1 Clutch Kit is engineered for bolt-on naturally aspirated engines and mildly modified forced induction applications. Delivering stock-like daily drivability with a meaningful performance upgrade, the Stage 1 is the ideal choice for drivers who demand reliable street manners without sacrificing track-ready capability.

At the heart of this kit is an integrally molded carbon Kevlar-based organic friction disc that provides smooth, predictable engagement and outstanding wear life. The lining features an integrally bonded steel backing for added strength under high clamp loads and elevated temperatures. The double-sprung hub includes spring cover reliefs for flexibility, while heat-treated internal components deliver long-term durability under demanding conditions.

Key Features:

• High-clamp performance pressure plate for improved holding capacity
• Carbon Kevlar-based organic friction material for smooth engagement and excellent disc life
• Steel-backed lining for strength under high clamp loads and temperatures
• Double-sprung hub with spring cover reliefs for flexibility
• Heat-treated hub components for strength and durability
• 9.500 in. disc diameter
• 10-spline input shaft, 1.125 in. diameter
• Kit includes pressure plate, clutch disc, release bearing, and installation hardware
• SFI Approved

Driving Applications: Street, Drag, Drift, Road Race, Rally, Pulling, Autocross

Designed and hand-built in the U.S.A., the SPEC SB051 Stage 1 kit is a proven performance upgrade that bridges the gap between stock reliability and serious motorsport capability — without the harshness or drivability compromises of more aggressive stages.