Spec Clutch SC45S Billet Steel Flywheel SFI Certified

The Spec Clutch SC45S is a high-carbon billet steel flywheel CNC-machined to an industry-leading .001-inch tolerance — ten times tighter than the industry standard of .010 inches. This precision manufacturing guarantees a perfectly flat clutch bedding surface and exceptional rotational balance, translating directly into reliable power transfer, reduced vibration, and extended drivetrain life. Every SC45S carries full SFI certification, making it suitable for competitive and high-rpm racing environments.

The SC45S billet steel flywheel is precision ground to mate perfectly to the crankshaft with minimal runout, providing a consistent and true surface compatible with a wide variety of clutch friction materials. Steel construction offers a medium-weight inertia profile that helps maintain RPM between gear changes, making it well-suited for heavy vehicles in drag racing applications as well as mildly modified street/strip builds.

Key Features:

• CNC machined to an ultra-precise .001-inch tolerance for perfect balance and a flat seating surface
• SFI certified — meets and exceeds SFI safety standards for high-rpm racing use
• Precision ground for minimal crankshaft runout and smooth engine revolutions
• High-carbon billet steel construction for durability and medium-weight inertia
• Rebuildable design with a replaceable steel friction plate formulated for optimum clutch bedding and holding power
• Compatible with a wide range of Spec clutch disc friction materials
• Recommended for heavy vehicles in drag racing and mildly modified street/strip applications

Spec Clutch engineers each flywheel for specific driving environments, carefully optimizing the moment of inertia (MOI) to complement your engine's power output, gear ratios, and vehicle weight. The SC45S is designed, hand-built, and tested in the USA.