Spec Clutch SZ035-2 Stage 5 Full-Metallic Performance Clutch Kit

The Spec Clutch SZ035-2 Stage 5 Clutch Kit is SPEC's most aggressive single-disc clutch offering, engineered for drivers who demand maximum grip and torque capacity at the limit. Built around a full-metallic friction disc with the highest available friction coefficient in the SPEC lineup, this kit delivers instant, aggressive engagement suited for extreme street use, drag racing, tractor pulling, and autocross competition. The Stage 5 is technically street-drivable, but its uncompromising performance characteristics make it best suited for dedicated race and track environments.

The disc features a solid 12-rivet hub, and the entire assembly undergoes heat treatment for superior strength and long-term durability under sustained high-load conditions. With a torque capacity of 544 lb-ft, this kit is purpose-built to handle high-output powerplants without slipping. A high-clamp pressure plate is included to maximize clamping force and ensure consistent power transfer. Note: This kit does not include a flywheel. It must be used with SPEC billet flywheel #SZ03A-2.

Key Features:

• Full-metallic friction disc — highest possible friction coefficient for maximum torque transfer
• Solid 12-rivet hub — rigid, high-torque disc assembly for demanding applications
• Heat-treated assembly — enhanced strength and durability under extreme load
• High-clamp pressure plate — maximizes clamping force for aggressive engagement
• 544 lb-ft torque capacity — engineered for high-output performance builds
• Includes bearing and tool kit — everything needed for installation

Recommended Driving Applications: Extreme Street, Drag Racing, Tractor Pulling, Autocross

SPEC Clutch manufactures every clutch and flywheel to precise tolerances in their purpose-built facility, ensuring consistent performance across the full Stage 1–5 lineup. The Stage 5 represents the top of the single-disc range, ideal for builds where outright holding power takes priority over street manners.