Clutch Plate Sizing Calculator

Size clutch friction disc for torque capacity using SAE J406 material standards and clamp load requirements.

Input Parameters

Results

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Required Capacity
N-m
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Mean Friction Radius
mm
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Required Clamp Force
N
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Contact Pressure
kPa
Note: SAE J406 covers clutch friction material standards. Safety factor of 1.25-1.5 for street, 1.5-2.0 for racing. Organic friction coefficient 0.30-0.40, ceramic 0.40-0.55.

Reference

Required Capacity = Engine_torque × Safety_factor Mean Radius = (2/3) × (Ro³ − Ri³) / (Ro² − Ri²) Clamp Force = Req_capacity / (N_faces × mu × R_mean) mu = 0.35 (organic friction material) Contact Pressure = Force / (Area × N_faces/2)