Spec Clutch ST185 Stage 5 Race Clutch Kit - Sintered Iron Full-Metallic Disc

The SPEC ST185 Stage 5 Clutch Kit is a full-race clutch system engineered for the most demanding, high-output applications. Purpose-built for extreme drag racing and tractor pulling, this kit delivers the highest possible clamping force and torque capacity in the SPEC single-disc lineup. It is also well-suited for applications requiring a slipper clutch or progressive torque-induced engagement.

Key Features:

• Full-metallic sintered iron disc with the highest available friction coefficient for maximum torque transfer
• High-clamp pressure plate for extreme holding power; adjustability available on select applications
• Solid 12-rivet unsprung hub assembly, heat-treated for exceptional strength and durability
• Race-only engagement — aggressive, on/off clutch feel optimized for drag and pulling applications
• Includes clutch disc, pressure plate, throw-out bearing, and alignment tool

Intended Use: Drag Racing, Tractor Pulling

Important Note: This is a race-only clutch. The unsprung hub design does not absorb drivetrain vibrations, resulting in harsh engagement characteristics that are not compatible with street driving. For best results, this kit should be spec'd and ordered in consultation with a SPEC technical representative to ensure proper configuration for your specific application and power level.