非螺纹密封的管螺纹的基本牙型和基本尺寸（GB/T7307-1987)(图文教程) ...

P＝25.4／n

H＝0.960 491P

h＝0.640 327P

r＝0.137 329P

H／6＝0.160 082P

d2＝D2＝d-0.640 327P

d1＝D1＝d-1.280 654P

尺寸代号

每25.4mm

内的牙数n

螺距P

牙高h

圆弧半径

r≈

基本直径

大径

d＝D

中径

d2＝D2

小径

d1＝D1

1／16

28

0.907

0.581

0.125

7.723

7.142

6.561

1／8

28

0.907

0.581

0.125

9.728

9.147

8.566

1／4

19

1.337

0.856

0.184

13.157

12.301

11.445

3／8

19

1.337

0.856

0.184

16.662

15.806

14.950

1／2

14

1.814

1.162

0.249

20.955

19.793

18.631

5／8

14

1.814

1.162

0.249

22.911

21.749

20.587

3／4

14

1.814

1.162

0.249

26.441

25.279

24.117

7／8

14

1.814

1.162

0.249

30.201

29.039

27.877

1

11

2.309

1.479

0.317

33.249

31.770

30.291

11

2.309

1.479

0.317

37.897

36.418

34.939

11

2.309

1.479

0.317

41.910

40.431

38.952

11

2.309

1.479

0.317

47.803

46.324

44.845

11

2.309

1.479

0.317

53.746

52.267

50.788

2

11

2.309

1.479

0.317

59.614

58.135

56.656

11

2.309

1.479

0.317

65.710

64.231

62.752

11

2.309

1.479

0.317

75.184

73.705

72.226

11

2.309

1.479

0.317

81.534

80.055

78.576

3

11

2.309

1.479

0.317

87.884

86.405

84.926

11

2.309

1.479

0.317

100.330

98.851

97.372

4

11

2.309

1.479

0.317

113.030

111.551

110.072

11

2.309

1.479

0.317

125.730

124.251

122.772

5

11

2.309

1.479

0.317

138.430

136.951

135.472

11

2.309

1.479

0.317

151.130

149.651

148.172

6

11

2.309

1.479

0.317

163.830

162.351

160.872