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ACT Part # ACTZM12-HDR4

ACT 16-25 Mazda MX-5 Miata HD/Race Rigid 4 Pad Clutch Kit - ZM12-HDR4

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ZM12-HDR4 kit features ACT's most popular Heavy Duty pressure plate. ACT Heavy Duty pressure plates use exclusive diaphragm design to increase clamp load, reduce deflection and maximize clutch life. All diaphragms endure a four-stage, heat-treating process for unparalleled performance. ACT pressure plates have precision cover stampings to provide rigidity and consistency. ACT's 4-pad rigid race discs are made with high quality, ceramic friction materials. The chrome-moly hub is heat-treated for strength and durability. The lightweight, rigid design allows for quicker shifts and smooth, trouble-free service. With the 4-pad rigid race disc, engagement is harsher, but shifting is faster. The 4-pad rigid race disc is well-suited for the smaller disc sizes in smaller engines.

  • Input Shaft Diameter: 0.9375 in.
  • Input Spline Quantity: 22
  • Disc Diameter: 224 mm
  • Part Fitment Requirement: 225mm upgrade. Must use ACT 600870 flywheel (not included in kit) or a modified OE flywheel. 600870 flywheel is compatible with the OE clutch kit as well as an ACT clutch kit. Flywheel sold separately from clutch kits. Pressure plate bolts included (M8-1.25 x 20mm).
  • Torque Capacity: 399 ft-lbs
  • Torque Capacity Over OE: 87%
  • Release Bearing Included: Yes
  • Alignment Tool Included: Yes
  • Disc Type: Solid
  • Pressure Plate Bolts Included: Yes
  • Grease Included: Yes
  • Pilot Bearing Included: Yes

Free U.S. standard shipping on qualifying orders $199+. Special order and made-to-order items can't be cancelled or refunded once ordered.

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