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
T2.515151818
T510301530
T1012602060
T201512025120
Min Teeth No Back BendingMin Pulley Diameter (mm) No Back BendingMin Teeth With Back BendingMin Pulley Diameter (mm) With Back Bending
AT315302530
AT515252060
AT10155025120
ATS152512040250
AT201812025180
ATN102580----
ATN12.72080----
ATN2020125----
ATL525402560
ATL10258025150
ATL20256025250
ATP10155025120
ATP152010030160
PitchMin Teeth No Back BendingMin Pulley Diameter No Back BendingMin Teeth With Back BendingMin Pulley Diameter With Back Bending
MXL10151815
XL10301530
L15602060
H14602080
XH1815025180
PitchMin Teeth No Back BendingMin Pulley Diameter No Back BendingMio Teeth With Back BendingMin Pulley Diameter With Back Bending
BAT10206025120
BATK10206025120
BAT152010030150
BATK152010030150
SFAT10155025120
SFAT152010025150
SFAT201812025180
TK5 K625602580
TK10 K625602580
TK10 K13258025120
TK20 K131812025180
ATK5 K625602580
ATK10 K6256025120
ATK10 K13206025120
ATK20 K132012025180
ATN10 K62580----
ATN12.7 K62080----
HK13188020120
LK1325802580
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