60°圆锥管螺纹的基本牙型和基本尺寸(GB/T12716-1991)(图文教程)

P＝25.4／n

H＝0.866025P

h＝0.8P

f＝0.033P

螺纹

尺寸

代号

每25.4mm

内的螺

纹牙数

n

基面上的基本直径

基准距离L1

装配余量L3

管子外径

圆锥外螺

纹小端面

处的螺纹

小 径

大径

(基准直径)

d＝D

中径

d2＝D2

小径

d1＝D1

距离

牙数

距离

牙数

1／16

27

7.895

7.142

6.389

4.064

4.32

2.822

3

7.938

6.135

1／8

27

10.242

9.489

8.736

4.102

4.36

2.822

3

10.287

8.480

1／4

18

13.616

12.487

11.358

5.786

4.10

4.234

3

13.716

10.997

3／8

18

17.055

15.926

14.797

6.096

4.32

4.234

3

17.145

14.416

1／2

14

21.223

19.772

18.321

8.128

4.48

5.443

3

21.336

17.813

3／4

14

26.568

25.117

23.666

8.611

4.75

5.443

3

26.670

23.128

1

11.5

33.228

31.461

29.694

10.160

4.60

6.627

3

33.401

29.059

11.5

41.985

40.218

38.451

10.668

4.83

6.627

3

42.164

37.784

11.5

48.054

46.287

44.520

10.688

4.83

6.627

3

48.260

43.854

2

11.5

60.092

58.325

56.558

11.074

5.01

6.627

3

60.325

55.866

8

72.699

70.159

67.619

17.323

5.46

6.350

2

73.025

66.536

3

8

88.608

86.068

83.528

19.456

6.13

6.350

2

88.900

82.312

8

101.316

98.776

96.236

20.853

6.57

6.350

2

101.600

94.932

4

8

113.973

111.433

108.893

21.438

6.75

6.350

2

114.300

107.553

5

8

140.952

138.412

135.872

23.800

7.50

6.350

2

141.300

134.384

6

8

167.792

165.252

162.712

24.333

7.66

6.350

2

168.275

161.191

8

8

218.441

215.901

213.361

27.000

8.50

6.350

2

219.075

211.673

10

8

272.312

269.772

267.232

30.734

9.68

6.350

2

273.050

265.311

12

8

323.032

320.492

317.952

34.544

10.88

6.350

2

323.850

315.793