Spec Clutch SF03A Tuned Billet Aluminum Flywheel SFI Certified - 1.1

The SPEC SF03A is a tuned billet aluminum flywheel CNC-machined to an industry-leading .001-inch tolerance — ten times more precise than the industry standard of .010. This exceptional precision delivers perfect rotational balance and a perfectly flat clutch disc seating surface, maximizing clutch performance and longevity in both street performance and competitive racing environments.

Constructed from aircraft-quality billet aluminum — either 6061-T6 or 2024-T3 tempered aluminum — the SF03A offers significant rotating mass reduction compared to OEM cast steel units. A replaceable 1/4-inch thick 1050 high-carbon alloy steel friction plate is included, specially formulated for optimum clutch bedding and holding power across all friction disc materials. The friction plate is secured with aerospace-grade fasteners or stainless steel rivets for superior strength and corrosion resistance.

Key Features:

• CNC-machined to .001-inch tolerance for perfect balance and a flat clutch seating surface
• Aircraft-quality billet aluminum construction (6061-T6 or 2024-T3) for lightweight strength
• Replaceable 1050 high-carbon alloy steel friction plate for long service life and rebuildability
• SFI 1.1 certified for use in sanctioned racing events
• 135-tooth ring gear
• Compatible with diaphragm-style pressure plates
• Weighs 12.5 lbs for meaningful rotating mass reduction
• Optimized Moment of Inertia (MOI) tuned for the specific vehicle application
• Sold individually

SPEC billet aluminum flywheels are engineered and recommended for highly modified street and racing applications, as well as mildly modified street cars that can benefit from reduced rotating mass without sacrificing daily drivability. All SPEC flywheels are designed, hand-built, and tested in the U.S.A.