Spec Clutch SZ373 Stage 3 Carbon Semi-Metallic Clutch Kit

The Spec Clutch SZ373 Stage 3 Clutch Kit is engineered for heavily modified street and race applications that demand aggressive torque capacity without sacrificing daily drivability. Featuring a high-clamp pressure plate and carbon semi-metallic friction material, this kit delivers quick, confident engagement with a comfortable pedal feel suitable for both street and competition use.

The Stage 3 disc uses a 6-puck sprung hub design (4-puck available on select applications) with a double-sprung hub featuring spring cover reliefs for flexibility under load. All hub components are heat-treated for enhanced strength and long-term durability. Depending on the specific application, a rigid hub disc may be supplied in place of the sprung hub.

Kit Includes:

• High-clamp performance pressure plate
• Carbon semi-metallic 6-puck sprung hub disc (4-puck on select applications)
• Release bearing
• Installation tool kit

Key Features:

• Carbon-graphite friction material — proven durability and high torque capacity in a puck clutch format
• Double-sprung hub with spring cover reliefs for smooth power transfer and drivetrain protection
• Heat-treated components for long service life under high-stress conditions
• High-clamp pressure plate for maximum clamping force and reliable engagement
• SFI Approved — meets SFI safety and performance standards
• 9.500 in. disc diameter with 23-spline, 1.031 in. input shaft

Intended Use: Street, Drag Racing, Drift, Road Racing, Rallye, Pulling, Autocross

The Stage 3 sits within SPEC's street/strip lineup (Stages 1–3+) and is the ideal choice for performance builds that require race-level holding power with everyday streetability. A properly resurfaced or new flywheel is recommended for installation.