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Drive Friction Factors

Belt conveyors utilize a friction drive and accordingly, when power is applied to the drive system, one run of the belt will experience a higher tension than the other. The amount of slack side tension required to prevent slippage at the drive is a function of several constant factors amongst others is the coefficient of friction between the drive system. Below is a list of standard drive pulley friction factors from various design catalogues and standards.



Friction Factor (Min) Friction Factor (Max) Description Reference
0.25 0.25 Rubber surfaced belt driving bare steel pulley CEMA
0.35 0.35 Rubber surfced belt driving rubeer lagged pulley surface CEMA
0.2 0.2 Bare pulley running in water CMA
0.35 0.35 dry lagged pulleys CMA
0.8 0.8 pulleys lagged with ceramics CMA
0.25 0.25 Bare Pulley CEMA
0.35 0.35 Lagged CEMA
0.35 0.35 Dry Lagged CEMA
0.35 0.35 Wet Lagged CEMA
0.35 0.35 Wet and Dirty Lagged CEMA
0.35 0.35 Bare Pulley STEVENS ADAMSON
0.35 0.35 Lagged STEVENS ADAMSON
0.35 0.35 Dry Lagged STEVENS ADAMSON
0.35 0.35 Wet Lagged STEVENS ADAMSON
0.35 0.35 Wet and Dirty Lagged STEVENS ADAMSON
0.1 0.3 Bare Pulley BRIDGESTONE
0.35 0.35 Dry Lagged BRIDGESTONE
0.2 0.3 Wet Lagged BRIDGESTONE
0.2 0.2 Wet and Dirty Lagged BRIDGESTONE
0.6 0.6 Dry Lagged LINATEX
0.8 0.8 Wet Lagged LINATEX
0.4 0.4 Wet and Dirty Lagged LINATEX
0.4 0.45 Dry Lagged REMA TIP TOP
0.35 0.35 Wet Lagged REMA TIP TOP
0.25 0.3 Wet and Dirty Lagged REMA TIP TOP
0.5 0.5 Dimpled Ceramic or equivalent hard material CEMA


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