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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

Pitch Min Teeth No Back Bending Min Pulley Diameter No Back Bending Min Teeth With Back Bending Min Pulley Diameter With Back Bending
T2 10 15 18 15
T2.5 15 15 18 18
T5 10 30 15 30
T10 12 60 20 60
T20 15 120 25 120
Min Teeth No Back Bending Min Pulley Diameter (mm) No Back Bending Min Teeth With Back Bending Min Pulley Diameter (mm) With Back Bending
AT3 15 30 25 30
AT5 15 25 20 60
AT10 15 25 50 120
ATS15 25 120 40 250
AT20 18 120 25 180
ATN10 25 80 -- --
ATN12.7 20 80 -- --
ATN20 20 125 -- --
ATL5 25 40 25 60
ATL10 25 80 25 150
ATL20 25 160 25 250
ATP10 15 50 25 120
ATP15 20 100 30 160
Pitch Min Teeth No Back Bending Min Pulley Diameter No Back Bending Min Teeth With Back Bending Min Pulley Diameter With Back Bending
MXL 10 15 18 15
XL 10 30 15 30
L 15 60 20 60
H 14 60 20 80
XH 18 150 25 180
Pitch Min Teeth No Back Bending Min Pulley Diameter No Back Bending Mio Teeth With Back Bending Min Pulley Diameter With Back Bending
BAT10 20 60 25 120
BATK10 20 60 25 120
BAT15 20 100 30 150
BATK15 20 100 30 150
SFAT10 15 50 25 120
SFAT15 20 100 25 150
SFAT20 18 120 25 180
TK5 K6 25 60 25 80
TK10 K6 25 60 25 80
TK10 K13 25 80 25 120
TK20 K13 18 120 25 180
ATK5 K6 25 60 25 80
ATK10 K6 25 60 25 120
ATK10 K13 20 60 25 120
ATK20 K13 20 120 25 180
ATN10 K6 25 80 -- --
ATN12.7 K6 20 80 -- --
HK13 18 80 20 120
LK13 25 80 25 80
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