Clutch Torque Capacity Calculator
SI
Imp
Imperial
Inputs
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Engine torque
(T_e)
Torque the clutch must hold.
lbf·ft
Clamp force
(F_c)
Pressure plate clamp force.
lbf
Friction coefficient
(mu)
Effective clutch lining coefficient.
Mean friction radius
(r_m)
Mean radius of the friction ring.
in
Friction surfaces
(n)
Single-disc clutch usually has two friction interfaces.
Safety factor
(SF)
Capacity divided by this factor for design comparison.
Results
Default result
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Design torque capacity
356.9
lbf·ft
Caution
Also computed
Torque margin
Caution
108
%
Raw torque capacity
446.1
lbf·ft
Required clamp force
1,882
lbf
1,882 lbf
Method notes
2 notes
Uses a simple uniform-wear mean-radius torque model.
Real clutch holding torque depends on lining material, temperature, pressure distribution, break-in, flywheel condition, release travel and dynamic shock loads.
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