SPEC Clutch SG145 Stage 5 Full-Metallic Performance Clutch Kit

The SPEC SG145 Stage 5 Clutch Kit represents the pinnacle of SPEC's single-disc clutch lineup, engineered for drivers who demand maximum torque transfer in extreme street and drag racing applications. Built around a full-metallic friction disc delivering the highest possible friction coefficient available in SPEC's single-disc range, this kit is technically street-drivable but is purpose-built for race and high-performance driving environments.

The disc assembly uses a solid 12-rivet hub construction and is heat-treated throughout for exceptional strength and long-term durability under repeated high-load engagement cycles. A high-clamp pressure plate works in tandem with the metallic disc to deliver aggressive, positive engagement at the torque levels demanded by competition use.

Key Features:

• Full-metallic friction disc — maximum friction coefficient for peak torque transfer
• High-clamp load pressure plate — aggressive clamping force for race-level performance
• Solid 12-rivet hub assembly — reinforced for high-torque durability
• Heat-treated disc assembly — enhanced strength and resistance to thermal fatigue
• Includes bearing and alignment tool kit — everything needed for installation
• SFI approved — meets safety certification standards for competition use

Intended Driving Applications: Extreme street, drag racing, pulling, and autocross.

The SPEC Stage 5 is rated for up to 1,150 ft-lbs of torque capacity, placing it at the top of the single-disc Stage lineup. While it remains technically street-drivable, the full-metallic friction material delivers an aggressive, on/off engagement character best suited to experienced drivers in performance and race environments. For primarily street-driven vehicles, SPEC Stage 1 through Stage 3+ kits are recommended.