ACT SB12-HDG4 Heavy Duty Race Sprung Clutch Kit - 4-Pad

The ACT SB12-HDG4 is a high-performance Heavy Duty Race Sprung 4-Pad Clutch Kit engineered for demanding street and racing applications. This complete clutch kit combines ACT's proven Heavy Duty pressure plate technology with an aggressive 4-pad spring-centered race disc to deliver exceptional torque capacity and reliability under extreme conditions.

Heavy Duty Pressure Plate Features:

• Exclusive diaphragm design increases clamp load while reducing deflection for maximum clutch life
• Four-stage heat-treating process ensures unparalleled performance and durability
• Precision cover stampings provide rigidity and consistency
• 100% clamp load tested and dynamically computer balanced for smooth high-RPM operation

4-Pad Spring-Centered Race Disc:

• Spring-centered design properly damps torsional vibrations for quieter operation
• Select ceramic friction materials deliver high heat tolerance and maximum performance
• Wraparound spring windows and thicker retainer stampings reduce stress concentrations and increase strength
• Engineered to resist failure even under harsh racing conditions
• Well-suited for smaller disc sizes in compact, high-performance engines

Performance Characteristics:

• Light to moderate pedal effort with aggressive engagement
• Harsher engagement delivers faster shifting response
• Moderate friction life extended by ACT's exclusive diaphragm design
• OE to mild gear rattle typical of performance race discs
• Computer spin balanced to within 0.25 oz-in for smooth operation across entire RPM range

This kit is recommended for high horsepower street vehicles and dedicated race applications where maximum torque capacity and quick engagement are priorities. ACT's precision engineering ensures reliable performance even under the most demanding conditions.