SPEC Clutch SB365 Stage 5 Clutch Kit - Sintered Iron Full-Face BMW Performance

The SPEC SB365 Stage 5 Clutch Kit is SPEC's most aggressive single-disc clutch offering, engineered for extreme performance applications including drag racing, pulling competitions, and autocross. Built around a full-metallic sintered iron disc, this kit delivers the highest possible friction coefficient available in a single-disc clutch assembly.

The Stage 5 is designed for heavily modified and high-output engines where maximum torque transfer and instant, firm engagement are critical. While technically street-drivable, the harsh engagement characteristics make this clutch best suited for dedicated race and competition use.

Key Features:

• Full-metallic sintered iron friction disc — highest friction coefficient for maximum torque transfer
• High-clamp pressure plate — delivers aggressive clamping force for extreme power levels
• Solid 12-rivet unsprung hub — rigid disc assembly provides instantaneous, direct engagement
• Heat-treated hub and disc assembly — engineered for strength and durability under race conditions
• 9.500 in. (241 mm) disc diameter with 10-spline, 1.125 in. input shaft fitment
• Bearing and tool kit included — complete installation hardware provided
• Flywheel not included — compatible with existing or upgraded flywheel

Ideal Applications: Drag racing, pulling, autocross, and extreme street performance builds requiring maximum clutch engagement and torque capacity.

Note: Due to the rigid iron disc and high-clamp pressure plate, the Stage 5 is not recommended for daily street driving. This is a competition-grade clutch best suited for purpose-built race vehicles. Consult a SPEC technical advisor to confirm this configuration is appropriate for your specific application.