Spec Clutch ST855-2 Stage 5 Clutch Kit - Drag & Pulling

The SPEC ST855-2 Stage 5 Clutch Kit is SPEC's most aggressive single-disc clutch offering, engineered specifically for heavily modified drag race and engine-pulling applications. Designed around a full-metallic sintered iron disc with the highest possible friction coefficient, this kit delivers immediate, no-slip engagement for competitors who demand maximum power transfer at the launch.

The Stage 5 is also well-suited for applications requiring a slipper clutch or progressive torque-induced engagement characteristic — making it a specialized tool for purpose-built race vehicles. Due to the iron disc's aggressive engagement profile, this kit is not recommended for street use.

What's Included:

• High-clamp pressure plate (adjustability available on select applications)
• Rigid sintered iron disc assembly with solid high-torque hub — 12-rivet construction, heat-treated for strength and durability
• Release bearing
• Installation tool kit

Key Features:

• Full-metallic iron friction surface for maximum torque capacity and minimal slip
• Solid, unsprung rigid hub for immediate, direct engagement
• High-clamp pressure plate for extreme clamping force
• Heat-treated hub components for long-term durability under abuse
• Custom configuration available — contact SPEC with vehicle and application details before ordering

Intended Use: Drag Racing, Engine Pulling

This kit is built to order and should be configured to your specific application. Consult with a SPEC technical representative with details about your vehicle and power goals prior to purchase to ensure proper fitment and disc configuration.