尺寸代号

每25．4mm内的牙数n

螺距P/mm

牙高h/mm

大径d，D/mm

中径d2，D2/mm

小径d1，D1/mm

1/16

28

0.907

0.581

7.723

7.142

6.561

1/8

28

0.907

0.581

9.728

9.147

8.566

1/4

19

1.337

0.856

13.157

12.301

11.445

3/8

19

1.337

0.856

16.662

15.806

14.95

1/2

14

1.814

1.162

20.955

19.793

18.631

5/8

14

1.814

1.162

22.911

21.749

20.587

3/4

14

1.814

1.162

26.441

25.279

24.117

7/8

14

1.814

1.162

30.201

29.039

27.877

1

11

2.309

1.479

33.249

31.77

30.291

1 1/8

11

2.309

1.479

37.897

36.418

34.939

1 1/4

11

2.309

1.479

41.91

40.431

38.952

1 1/2

11

2.309

1.479

47.803

46.324

44.845

1 3/4

11

2.309

1.479

53.746

52.267

50.788

2

11

2.309

1.479

59.614

58.135

56.656

2 1/4

11

2.309

1.479

65.71

64.231

62.752

2 1/2

11

2.309

1.479

75.184

73.705

72.226

2 3/4

11

2.309

1.479

81.534

80.055

78.576

3

11

2.309

1.479

87.884

86.405

84.926

3 1/2

11

2.309

1.479

100.33

98.851

97.332

4

11

2.309

1.479

113.03

111.551

110.072

4 1/2

11

2.309

1.479

125.73

124.251

122.772

5

11

2.309

1.479

138.43

136.951

135.472

5 1/2

11

2.309

1.479

151.13

149.651

148.172

6

11

2.309

1.479

163.83

162.351

160.872