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ACT HD/Race Rigid 4 Pad Kit Mazda Miata 2016-2018 - ZM12-HDR4

If you're looking for a clutch kit that can really handle the heat—literally and figuratively—check out the Advanced Clutch HD/Race Rigid 4 Pad Kit ZM12-HDR4. This isn't just any clutch; it's built around ACT's Heavy Duty pressure plate, which is a favorite among those who push their rides to the limit. The unique diaphragm design cranks up the clamp load while keeping deflection in check, which means you're getting a longer-lasting clutch that can take a beating.

Now, let’s talk about that diaphragm. It goes through a four-stage heat-treating process, which gives it some serious performance chops. Plus, the precision cover stampings provide the rigidity and consistency you want when you’re on the track or just having fun on a weekend drive. And those 4-pad rigid race discs? Made from high-quality ceramic friction materials, they’re tough as nails. The chrome-moly hub is heat-treated, so you know it’s built to last.

One of the best parts about this setup is how lightweight and rigid it is. That means quicker shifts and a smoother experience overall. Sure, the engagement is a bit harsher—don't expect a buttery feel here—but if you want speed, this setup delivers. It’s particularly well-suited for smaller engines where every bit of performance counts.

Install Instructions:

Features:

  • Light to moderate pedal effort with aggressive engagement—get ready for some gear rattle!
  • Moderate friction life, but thanks to ACT's diaphragm design, you might find it lasts longer than expected. Just be aware that the rigid design can increase spline wear.
  • Carefully engineered and precisely assembled with select ceramic materials that can handle high heat for maximum performance.
  • Best suited for race use—this isn’t your everyday driver’s clutch.
  • Every unit is 100% clamp load tested and dynamically balanced for reliable high RPM performance.

Specifications:

  • Clutch Master Cylinder Included: No
  • Grease Included: Yes
  • Grade Type: Performance
  • Pilot Bushing Included: No
  • Pressure Plate Type: Heavy Duty
  • Release Bearing Included: Yes
  • Clutch Disc Diameter: 8.8 in (224 mm)
  • Disc Material: Ceramic
  • Input Spline Quantity: 22
  • Input Shaft Diameter: 0.9375 in
  • Alignment Tool Included: Yes
  • Disc Type: Solid
  • Pressure Plate Bolts Included: Yes
  • Clutch Slave Cylinder Included: No
  • Flywheel Bolts Included: No
  • Pilot Bearing Included: Yes
  • Product Weight: 14.8 lbs
  • Torque Capacity: 399 ft/lbs (0.87 over OE)

Notes:

  • This is a 225mm upgrade. You'll need to pair it with the ACT 600870 flywheel (not included) or a modified OE flywheel. The 600870 flywheel will work with both OE and ACT clutch kits. Just a heads up—flywheel is sold separately from the clutch kits, but pressure plate bolts are included (M8-1.25 x 20mm).

Products Fitment:
Mazda Miata 2016-2018 ZM12-HDR4 ACT HD/Race Rigid 4 Pad Kit.

Other Part Numbers:
ACT #actZM12-HDR4

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2016-2018
 Mazda Miata

ACT Banner

ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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