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Details & Features

ACT Race Clutch Discs

ACT race discs can be ordered in 4- or 6-pad configurations, either with spring-centered or rigid-hub designs. For larger clutch sizes, ACT recommends 6-pad race discs for more heat capacity and smoother engagement. Race discs with 4 pads engage harsher, yet shift faster, and are better suited for smaller disc sizes.

Understanding ACT's Race Discs

SPRING CENTERED RACE DISC

  • Most popular choice
  • Reduced driveline shock and spline wear due to torsional damping
  • Quieter operation by reducting gear rattle
  • Choose 6 pads for higher heat capacity and better engagement
  • Choose 4 pads for quicker shifting

RIGID-HUB RACE DISC

  • Improved durability from stronger hub components
  • Increased gear noise and increased spline wear is expected
  • Choose 6 pads for higher heat capacity and better engagement
  • Choose 4 pads for quicker shifting

FULL-FACED SINTERED IRON RACE DISC

  • Best choice for cars using clutchless shifting or drag racing transmissions
  • Highest torque ratings
  • Ultra-high heat capacity

ACT Race Clutch Disc Key Features

SFI CERTIFIED

All Race discs are certified as meeting SFI® Specification 1.1 and are legal in all racing organizations that require SFI® Certification.

PRECISION BROACHED SPLINES

Precision-broached splines ensure an exact fit onto the transmission input shaft for long spline life and better clutch release.

PREMIUM CERAMIC MATERIAL

Premium ceramic friction materials provide high heat tolerance, high coefficient of friction (µ) and low wear rates.

THICKER STAMPINGS

Thicker retainer stampings for improved strength and reliability.

HEATED TREATED HIGH-CARBON SPRING STEEL

All drive plates are made from high-carbon spring steel, then heat-treated and zinc-plated to resist bending, cracking, fatigue and corrosion under the most severe racing conditions.

PRECISION STAMPINGS

Disc components are manufactured using precision stampings from dedicated tooling, allowing the highest quality and consistency.

IMPROVED RETAINERS

ACT spring retainers are designed with wrap-around spring windows to provide additional support and reduce stress concentrations, which eliminate common causes of failure. These improved retainers are found on most ACT Modified and Performance street discs.

IMPROVED CLUTCH LIFE & REDUCED NOISE

Most ACT spring-centered assemblies use bushings and cone or wave springs, similar to factory clutch discs. This creates frictional damping to improve clutch life and reduce noise.

HEAVY DUTY TORSIONAL DAMPER SPRINGS

Heavy duty torsional damper springs are typically stronger than standard springs and are engineered to suit each application.

TOP GRADE RIVETS

Top grade rivets, carefully selected for maximum strength and toughness, are used to securely fasten the disc assembly.