Spec Clutch SFD331S-9 Stage 1 Sprung Clutch Disc for Single Mass Flywheel

The SPEC SFD331S-9 is a Stage 1 sprung clutch disc designed for use with a Single Mass Flywheel (SMF) setup. Built for performance-minded drivers who want a meaningful upgrade over the factory clutch disc without sacrificing daily driveability, the Stage 1 disc delivers smooth, predictable engagement and improved durability.

Key Features:

• Carbon Kevlar-Based Organic Lining — Integrally molded high-performance organic friction material provides smooth engagement and excellent service life
• Steel-Backed Lining — Integrally bonded steel backing delivers strength and stability under high clamp loads and elevated temperatures
• Sprung Hub Design — Double-sprung hub with spring cover reliefs for torsional flexibility, paired with heat-treated components for long-term strength and durability
• Single Mass Flywheel (SMF) Compatible — Engineered specifically for use with SMF conversions or SMF-equipped applications
• Stage 1 Performance Level — Ideal for street driving, drag, drift, road racing, rallye, pulling, and autocross
• Made in the USA — SPEC designs and manufactures performance clutch components domestically

The SPEC Stage 1 sprung disc bridges the gap between OEM replacement and all-out performance. With its carbon Kevlar friction compound and robust sprung hub construction, the SFD331S-9 is an excellent choice for street and light track use where smooth engagement and reliability are priorities.