Module
1
Teeth
20
Teeth1
40
i ratio
1:2
A centre distance
26.2
A1
21.1
B
5
Tolerance (B)
H7
B1
6
Tolerance (B1)
H7
b tooth width
5
d
20
d1
40
da external diameter
21.8
da1
40.8
H
11
H1
14
L
9.5
L1
12
N
15
N1
20
n
5
n1
8