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GB/T7307-1987管螺纹基本尺寸表
公称直径
（英寸） |
每英寸
牙数n |
螺距t |
螺纹直径 |
牙形高度
h1 |
圆弧半径
r |
| 外径d |
中径d2 |
内径d1 |
| （1/8） |
28 |
0.907 |
9.729 |
9.148 |
8.567 |
0.581 |
0.125 |
| 1/4 |
19 |
1.337 |
13.158 |
12.302 |
11.446 |
0.856 |
0.184 |
| 3/8 |
19 |
16.663 |
15.807 |
14.951 |
0.856 |
0.184 |
| 1/2 |
14 |
1.814 |
20.956 |
19.794 |
18.632 |
1.162 |
0.249 |
| （5/8） |
14 |
00.912 |
21.750 |
20.588 |
| 3/4 |
14 |
26.442 |
25.281 |
24.119 |
| （7/8） |
14 |
30.202 |
29.040 |
27.878 |
| 1 |
11 |
2.309 |
33.250 |
31.771 |
30.293 |
1.479 |
0.317 |
| 1.1/8 |
11 |
37.898 |
36.420 |
34.941 |
| 1.1/4 |
11 |
41.912 |
40.433 |
38.954 |
| 1.3/8 |
11 |
44.325 |
42.846 |
41.367 |
| 1.1/2 |
11 |
47.805 |
46.326 |
44.847 |
| 1.3/4 |
11 |
53.748 |
52.270 |
50.791 |
| 2 |
11 |
59.616 |
58.137 |
56.659 |
| 2.1/4 |
11 |
65.712 |
64.234 |
62.755 |
| 2.1/2 |
11 |
75.187 |
73.708 |
72.230 |
| 2.3/4 |
11 |
81.537 |
80.058 |
78.580 |
| 3 |
11 |
87.887 |
86.409 |
84.980 |
| 3.1/2 |
11 |
100.334 |
98.855 |
97.376 |
| 4 |
11 |
113.034 |
111.556 |
110.077 |
| 5 |
11 |
138.435 |
136.957 |
135.478 |
| 6 |
11 |
163.836 |
162.357 |
160.879 | |
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