Spec Clutch SC05S High-Carbon Billet Steel Flywheel SFI Certified

The Spec Clutch SC05S is a high-carbon billet steel performance flywheel precision-engineered to deliver exceptional clutch performance, rotational integrity, and SFI-certified safety for street, strip, and competitive driving environments. Unlike generic flywheel offerings, this is a purpose-developed, application-specific unit designed around how each vehicle responds to changes in rotating mass.

Precision Manufacturing:

The SC05S is CNC machined to an industry-leading .001-inch tolerance — ten times tighter than the industry-standard .010 — guaranteeing a perfectly flat clutch bedding surface, minimal dimensional runout, and flawless rotational balance at all RPM levels. This level of precision eliminates vibration that can rob power and accelerate engine wear.

Key Features:

• High-carbon billet steel construction for durability and medium-weight inertia suited to a wide range of performance applications
• Rebuildable design with a replaceable steel friction plate formulated specifically for optimal clutch bedding and maximum holding power
• SFI certified — meets the safety standards required for competitive motorsport environments
• CNC machined to .001-inch tolerance — 10x tighter than the industry standard of .010
• Single-mass, high-performance unit engineered for street/strip and track use
• Optimized Moment of Inertia (MOI) — flywheel weight and dimensions are developed through SPEC's in-house R&D program to maximize power delivery and drivability for the specific application
• Available with an Extra Mass option for increased rotating mass and improved gear noise dampening

The flywheel plays a critical role in clutch system performance, providing the friction surface for the clutch disc, controlling inertia to balance power-to-acceleration ratios, and maintaining true rotational balance to protect drivetrain components. The SC05S steel flywheel offers a medium-weight inertia profile, making it well-suited for street/strip applications and heavily modified builds where the added mass aids drivability and smooth power transfer.

All SPEC flywheels are manufactured and tested in-house, allowing SPEC Clutch to control every aspect of production and ensure each unit meets their strict quality and performance standards.