Spec Clutch SF665-2 Stage 5 Full-Metallic Sintered Iron Clutch Kit

The Spec Clutch SF665-2 Stage 5 Clutch Kit represents the pinnacle of single-disc clutch performance, engineered for drivers who demand maximum holding power for extreme street, drag racing, pulling, and autocross applications. Featuring a full-face sintered iron disc with the highest available friction coefficient, this kit delivers aggressive, positive engagement that outperforms every lower stage in the SPEC lineup.

The SF665-2 is technically street-drivable, but is best suited to purpose-built performance and race vehicles where clutch aggression and torque capacity take priority over daily comfort. The solid 12-rivet hub and heat-treated disc assembly are built to endure the punishment of repeated hard launches and high-load driving conditions.

Key Features:

• Full-metallic sintered iron friction material — maximum friction coefficient for extreme torque transfer
• High-clamp pressure plate — delivers superior clamping force over OEM and lower-stage units
• Solid 12-rivet unsprung hub — rigid, high-torque disc assembly with no flex under load
• Heat-treated assembly — enhanced strength and durability under sustained extreme use
• Bearing and tool kit included — everything needed for a complete installation
• SFI approved — meets SFI certification standards for high-performance clutch systems

Recommended Applications: Extreme street, drag racing, pulling, autocross

The SPEC Stage 5 sits at the top of SPEC's single-disc performance clutch range, which spans seven stages from street-friendly Stage 1 through race-focused Stage 5. All SPEC clutch kits are manufactured and developed for specific driving environments under strict tolerances, making the SF665-2 a trusted choice among serious performance enthusiasts and racers.