A clutch disc is a mechanical assembly with friction material on both sides. It connects the engine to the transmission by a splined hub when squeezed between the Pressure Plate and flywheel.

Most clutch discs use torsional springs in the splined hub to make engagement smoother.

a picture of full face, segmented, and paddle clutch discs

Clutch makers use lots of different terms to describe their friction material. The following list groups them by similar aggressiveness, engagement and wear.

Organic clutches

Organic clutches are the most used type of clutch. They offer smooth engagement and a long life under normal driving conditions. Organic clutches do not respond well to high rpm shifting and prolonged abuse. Generally, these are made of carbon and woven aramid or metal fibers. 

Kevlar Clutches

Kevlar is a more aggressive friction material that still offers fairly smooth engagement. It will chatter at low speed and in reverse. Kevlar glazes easily in traffic and will slip until the glaze is worn off. Once a Kevlar clutch is overheated, it should be replaced.

Hybrid Organic

A hybrid clutch usually has full face organic material on one side and a more aggressive segmented material on the other. These clutches offer smooth engagement and increased power handling.

Ceramic /Metallic/ Cera-metallic/ Carbon Composite

The engagement of these materials is more abrupt and may chatter, shudder, or have a stepped engagement. These clutches will wear flywheel surfaces faster, especially in traffic situations. They tend to come in “segmented” style discs.

Sintered Iron/Sintered Bronze/Sintered Metallic

Sintered clutches are the most aggressive clutch material. They have an on/off engagement. Mostly used in drag cars and other competitions, these clutches often require special flywheels. They come in “paddle” style discs and wear the clutch assembly and flywheel quickly.

The following chart gives some guidelines for clutch disc selection. Always refer to the clutch manufacturer’s specifications for power handling and use.

  Single Disc Max HP Twin Disc Max HP  Best Uses
Organic 400-450 HP 700 -750 HP Street / Light Track / Light Off-Road and Towing
Kevlar 500-550 HP N/A Track / Off-Road and Towing
Hybrid Organic 500-600 HP 900-1000 HP Street / Track / Off-Road and Towing
Ceramic /Metallic/ Cera-metallic/ Carbon Composite 550-650 HP 1100-1200 HP Street / Track / Off-Road and HeavyTowing
Sintered Iron/Sintered Bronze/Sintered Metallic 700+ HP  1400 HP Track / Extreme Off-Road 

Note: For heavy vehicles, sticky tires, racing, or towing heavy loads, stick to the low end of the horsepower range.

Related Products: Other Transmission & Drivetrain, Transmissions