Spec Clutch SF505-9 Stage 5 Full-Metallic Sintered Iron Clutch Kit

The Spec Clutch SF505-9 Stage 5 Clutch Kit is SPEC's highest-performance single-disc clutch, engineered specifically for drag racing and extreme high-powered applications. Featuring a full-metallic sintered iron disc with the maximum possible friction coefficient, this kit delivers instantaneous, aggressive engagement that serious racers demand. While technically street drivable, it is not designed for comfortable daily driving — this is a purpose-built racing clutch.

Key Features:

• Full-metallic sintered iron disc — unsprung, rigid construction for instant, forceful engagement
• High clamp pressure plate — maximizes clamping force for superior torque transfer
• Solid 12-rivet hub assembly — heat-treated for exceptional strength and long-term durability
• Up to 1,060 lb-ft torque capacity at the flywheel
• 9-bolt pressure plate cover pattern — designed for use with 9-bolt flywheel applications
• SFI 1.1 Certified — meets sanctioning body requirements for competition use
• Compatible with stock flywheels or SPEC flywheels SF50S-9 / SF50A-9
• Includes high clamp pressure plate, iron disc assembly, and installation tool

Recommended Driving Applications: Drag Racing, Pulling, Autocross, Extreme Street

The Stage 5 is SPEC's strongest single-disc clutch, built for applications requiring a slipper clutch with progressive torque-induced engagement. Professional installation is recommended. A minimum 450-mile break-in period on city/stop-and-go driving is required before full-throttle or drag-launch use. If using an existing flywheel, resurfacing prior to installation is required to maintain friction surface integrity.

SPEC backs this clutch with a 120-day limited warranty against defects in materials and workmanship under normal use and service.