How many friction surfaces in multi-plate clutch?

Z = n_p - 1 for single acting, where n_p = number of plates.

Typical friction coefficient?

Dry: 0.25–0.35 (organic), Wet: 0.08–0.12, Cone: 0.25–0.30.

0.5–1.5 MPa for organic, higher for sintered.

AutoEngCalc - Engineering Calculators

Design single/multi-plate and cone clutches: calculate plate diameter, number of surfaces, axial force and torque capacity from torque and speed.

Number of Surfaces

Z = 4

For 400 Nm torque, dry clutch

Featured: Single/Multi Plate, Cone • Uniform Wear/Pressure

Max Torque T (Nm)

Engine Speed (RPM)

Clutch Type

Friction Coefficient μ

Max Pressure p (MPa)

Service Factor K_s

Cone Angle α (°) - for Cone

T = Z × μ × W × R_mean
W = π p (R1² - R2²)
R_mean = (R1 + R2)/2

T = μ W / sinα × R_mean

Enter parameters and click Calculate

Simple, automotive standard.

Compact, high torque (motorcycles).

Oil cooled, smooth engagement.

High torque, self-centering.

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