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| 尺寸代号 |
每英寸牙数 |
螺 距 |
螺纹 直 径 |
| （in) |
n |
p |
大径D、d |
小径D1、d1 |
| 1/16 |
28 |
0.907 |
7.723 |
6.561 |
| 1/8 |
28 |
0.907 |
9.728 |
8.566 |
| 1/4 |
19 |
1.337 |
13.157 |
11.445 |
| 3/8 |
19 |
1.337 |
16.662 |
14.95 |
| 1/2 |
14 |
1.814 |
20.955 |
18.631 |
| 5/8 |
14 |
1.814 |
22.911 |
20.587 |
| 3/4 |
14 |
1.814 |
26.441 |
24.117 |
| 7/8 |
14 |
1.814 |
30.201 |
27.877 |
| 1 |
11 |
2.309 |
33.249 |
30.291 |
| 1-1/8 |
11 |
2.309 |
37.897 |
34.939 |
| 1-1/4 |
11 |
2.309 |
41.91 |
38.952 |
| 1-1/2 |
11 |
2.309 |
47.803 |
44.845 |
| 1-3/4 |
11 |
2.309 |
53.746 |
50.788 |
| 2 |
11 |
2.309 |
59.614 |
56.656 |
| 2-1/4 |
11 |
2.309 |
65.71 |
62.752 |
| 2-1/2 |
11 |
2.309 |
75.184 |
72.226 |
| 2-3/4 |
11 |
2.309 |
81.534 |
78.578 |
| 3 |
11 |
2.309 |
87.884 |
84.926 |
| 3-1/2 |
11 |
2.309 |
100.33 |
97.372 |
| 4 |
11 |
2.309 |
113.03 |
110.072 |
| 5 |
11 |
2.309 |
138.43 |
135.472 |
| 6 |
11 |
2.309 |
163.83 |
160.872 |
| 注：1in=25.4mm |
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| 1、用螺纹密封的管螺纹其标记及各种螺纹的特征代号规定如下： |
| Rc—圆锥内螺纹 |
| Rp—与圆锥外螺纹配合的圆柱内螺纹 |
| R—圆锥外螺纹 |
| 标准规定将螺纹尺寸代号写在特征代号之后，若螺纹为械旋应再加写左旋 |
| 代号LH，具体示例如下： |
| 圆锥内螺纹：Rc1/2 |
| 左旋圆柱内螺纹：Rp1/2—LH |
| 圆柱内螺纹与圆锥外螺纹的配合：Rp2/R2 |
| 2、非螺纹密封的管螺纹标记如下： |
| A级外螺纹：G1/2A |
| 内螺纹：G1/2 |
| 左旋B级外螺纹：G1/2B—LH |
| 螺纹副G1/2G1/2A | |
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