Threaded Code

Basic dimensions

Large diameter
mm 
d = D

Pitch
mm 
P

Number of teeth per inch 
tpi

In diameter
mm 
D2 = D2

Trails 
external thread
d3

Tooth-height
H1

Bottom Dimensions
mm

G 1/8

1/8 "

9.728

0.907

28

9.147

8.566

0.581

8.7

G 1/4

1/4 "

13.157

1.337

19

12.301

11.445

0.856

11.6

G 3/8

3/8 "

16.662

1.337

19

15.806

14.95

0.856

15

G 1/2

1/2 "

20.955

1.814

14

19.793

18.631

1.162

19

G 5/8

5/8 "

22.911

1.814

14

21.749

20.587

1.162

20.75

G 3/4

3/4 "

26.441

1.814

14

25.279

24.117

1.162

24.5

G 7/8

7/8 "

30.201

1.814

14

29.039

27.877

1.162

28

G 1

1 "

33.249

2.309

11

31.77

30.291

1.479

30.5

G 1 1/8

1 1/8 "

37.897

2.309

11

36.418

34.939

1.479

35

G 1 1/4

1 1/4 "

41.91

2.309

11

40.431

38.952

1.479

39.5

G 1 3/8

1 3/8 "

44.323

2.309

11

42.844

41.365

1.479

41.5

G 1 1/2

1 1/2 "

47.803

2.309

11

46.324

44.845

1.479

45

G 1 3/4

1 3/4 "

53.746

2.309

11

52.267

50.788

1.479

51

G 2

2 "

59.614

2.309

11

58.135

56.656

1.479

57

G 2 1/4

2 1/4 "

65.71

2.309

11

64.231

62.752

1.479

63

G 2 1/2

2 1/2 "

75.184

2.309

11

73.705

72.226

1.479

72.5

G 2 3/4

2 3/4 "

81.534

2.309

11

80.055

78.576

1.479

79

G 3

3 "

87.884

2.309

11

86.405

84.926

1.479

85.5

G 3 1/4

3 1/4 "

93.98

2.309

11

92.501

91.022

1.479

91

G 3 1/2

3 1/2 "

100.33

2.309

11

98.351

97.372

1.479

97.75

G 3 3/4

3 3/4 "

106.68

2.309

11

105.201

103.722

1.479

104

G 4

4 "

113.03

2.309

11

111.55

110.072

1.479

110.5

G 4 1/2

4 1/2 "

125.73

2.309

11

124.251

122.772

1.479

123

G 5

5 "

138.43

2.309

11

136.951

135.472

1.479

136

G 5 1/2

5 1/2 "

151.13

2.309

11

149.651

148.172

1.479

148.5

G 6

6 "

163.83

2.309

11

162.351

160.872

1.479

161.5