Spur Gear Mounting Factor Km

Characteristic of Support

Face width (in)

0 to 2

6

9

16 up

Accurate mountings, small bearing clearances, minimum deflection, precision gears

0.3

0.4

1.5

1.8

Less rigid mountings, less accurate gears, contact across full face

1.6

1.7

1.8

2.2

Accuracy and mounting such that less than full-face contact exists

over 2.2