Minimum Pulley Diameter

The size selection of the pulleys and the idlers is instrumental to drive performance and service life. Minimum pulley diameter and number of teeth are in direct relation with the tooth pitch. It is recommended to aim always for a bigger pulley or idler size to avoid belt tension member fatigue. The chart below will tell you the minimum number of teeth for your belt pitch and configuration.

minimum number of teeth on pulley

No Back Bending

Minimum # of teeth on pulley

flat idler inside

No Back Bending

Min. diameter of flat idler in mm

idler pulley on outside

With Back Bending

Minimum # of teeth on pulley

minimum diameter of flat idler

With Back Bending

Min. diameter of flat idler in mm

PitchMin Teeth No Back BendingMin Pulley Diameter No Back BendingMin Teeth With Back BendingMin Pulley Diameter With Back Bending
T210151815
T2.510181518
T510153030
T1012206060
T201525120120
Min Teeth No Back BendingMin Pulley Diameter (mm) No Back BendingMin Teeth With Back BendingMin Pulley Diameter (mm) With Back Bending
AT315253030
AT515202560
AT10155025120
ATS152540120250
AT201825120180
ATN1025--80--
ATN12.720--80--
ATN2020--125--
ATP10152550120
ATP152030100160
PitchMin Teeth No Back BendingMin Pulley Diameter No Back BendingMio Teeth With Back BendingMin Pulley Diameter With Back Bending
MXL10181515
XL10153030
L15206060
H14206080
XH1825150180
PitchMin Teeth No Back BendingMin Pulley Diameter No Back BendingMio Teeth With Back BendingMin Pulley Diameter With Back Bending
BAT10202560120
BATK10202560120
BAT152030100150
BATK152030100150
SFAT10152550120
SFAT152025100150
SFAT201825120180
TK5 K625256080
TK10 K625256080
TK10 K13252580120
TK20 K131825120180
ATK5 K625256080
ATK10 K6252560120
ATK10 K13202560120
ATK20 K132025120180
ATN10 K625--80--
ATN12.7 K620--80--
HK13182080120
LK1325258080
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