mm

Module
m

No.of teeth
z

Pitch dia
d

Diameter of
Hole
d

Thickness
ha*

Thickness
B1

Thickness
B

1

50

50

20

1.25

14

25

1.25

40

50

1.5

34

51

1.75

29

50.75

17

2

25

50

2.25

22

49.5

2.5

20

50

2.75

18

49.5

3

17

51

20

27

3.25

15

48.75

3.5

14

49

Nominal pitch diameter Φ75mm  α20° 

mm

Module
m

No.of teeth
z

Pitch dia
d

Diameter of
Hole
d

Thickness
ha*

Thickness
B1

Thickness
B

1

76

76

31.743

1.25

15

30

1.25

60

75

1.5

50

75

1.75

43

75.25

17

2

38

76

2.25

34

76.5

2.5

30

75

2.75

28

77

3

25

75

20

32

3.25

24

78

3.5

22

77

3.75

20

75

4

19

76

Nominal pitch diameter Φ100mm     α20° 

 mm

Module
m

No.of teeth
z

Pitch dia
d

Diameter of
Hole
d

Thickness
ha*

Thickness
B1

Thickness
B

1

100

100

31.743

1.25

18

32

1.25

80

100

1.5

68

102

1.75

58

101.5

22

34

2

50

100

2.25

45

101.25

2.5

40

100

2.75

36

99

3

34

102

3.25

31

100.75

3.5

29

101.5

24

36

3.75

27

101.25

4

25

100

4.5

22

99

1.3

5

20

100

5.5

19

104.5

6

18

108

Nominal pitch diameter  Φ125mm   α20° 

 mm

Module
m

No.of teeth
z

Pitch dia
d

Diameter of
Hole
d

Thickness
ha*

Thickness
B1

Thickness
B

4

31

124

31.743

1.3

28

40

4.5

28

126

5

25

125

5.5

23

126.5

6

21

126

6.5

19

123.5

7

18

126

8

16

128