《螺纹对照表1-2》
美制管螺纹基本尺寸及公差（牙形角60º） UN(F)
|
螺纹代号 |
外螺纹 |
内螺纹 |
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|
公差等级 |
公差等级 |
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|
2A |
2B |
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|
大径 |
中径 |
小径 |
小径 |
中径 |
大径 |
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|
最大 |
最小 |
最大 |
最小 |
|
最小 |
最大 |
最小 |
最大 |
|
|
|
JIC螺纹 |
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|
7/16″×20UNF |
11.079 |
10.874 |
10.254 |
10.147 |
9.568 |
9.728 |
10.033 |
10.287 |
10.424 |
11.113 |
|
1/2″×20UNF |
12.667 |
12.461 |
11.841 |
11.732 |
11.156 |
11.328 |
11.608 |
11.875 |
12.017 |
12.7 |
|
9/16″×18UNF |
14.252 |
14.031 |
13.335 |
13.221 |
12.573 |
12.751 |
13.081 |
13.371 |
13.52 |
14.288 |
|
3/4″×16UNF |
19.012 |
18.773 |
17.981 |
17.854 |
17.12 |
17.323 |
17.678 |
18.019 |
18.184 |
19.05 |
|
7/8″×14UNF |
22.184 |
21.923 |
21.006 |
20.869 |
20.025 |
20.269 |
20.676 |
21.046 |
21.224 |
22.225 |
|
1-1/16″×12UN |
26.944 |
26.655 |
25.57 |
25.425 |
24.425 |
24.689 |
25.146 |
25.613 |
25.801 |
26.988 |
|
1-5/16″×12UN |
33.294 |
33.005 |
31.92 |
31.773 |
30.775 |
31.039 |
31.496 |
31.963 |
32.154 |
33.338 |
|
1-5/8″×12UN |
41.229 |
40.94 |
39.885 |
39.705 |
38.71 |
38.989 |
39.446 |
39.901 |
40.094 |
41.275 |
|
1-7/8″×12UN |
47.579 |
47.29 |
46.205 |
46.053 |
45.06 |
45.339 |
45.796 |
46.251 |
46.449 |
47.625 |
|
2-1/2″×12UN |
63.452 |
63.162 |
62.078 |
61.92 |
60.932 |
61.214 |
61.671 |
62.126 |
62.332 |
63.5 |
|
ORFS螺纹 |
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|
9/16″×18UNF |
14.252 |
14.031 |
13.335 |
13.221 |
12.573 |
12.751 |
13.081 |
13.371 |
13.52 |
14.288 |
|
11/16″×16UN |
17.427 |
17.188 |
16.396 |
16.274 |
15.535 |
15.748 |
16.104 |
16.431 |
16.589 |
17.463 |
|
13/16″×16UN |
20.599 |
20.361 |
19.568 |
19.444 |
18.707 |
18.923 |
19.279 |
19.606 |
19.766 |
20.638 |
|
1″×14UNF |
25.357 |
25.095 |
24.178 |
24.036 |
23.195 |
23.444 |
23.825 |
24.221 |
24.407 |
25.4 |
|
1-3/16″×12UN |
30.119 |
29.83 |
28.745 |
28.598 |
27.6 |
27.864 |
28.321 |
28.788 |
28.979 |
30.163 |
|
1-7/16″×12UN |
36.467 |
36.177 |
35.093 |
34.943 |
33.947 |
34.214 |
34.671 |
35.138 |
35.331 |
36.513 |
|
1-11/16″×12UN |
42.817 |
42.527 |
41.443 |
41.29 |
40.297 |
40.564 |
41.021 |
41.488 |
41.686 |
42.863 |
|
2″×12UN |
50.754 |
50.465 |
49.38 |
49.225 |
48.235 |
48.514 |
48.971 |
49.426 |
49.627 |
50.8 |
|
SAE螺纹 |
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|
5/8″×18UNF |
15.839 |
15.618 |
14.923 |
14.803 |
14.161 |
14.351 |
14.681 |
14.958 |
15.11 |
15.875 |
|
1-1/16″×14UN |
26.947 |
26.683 |
25.743 |
25.608 |
24.74 |
24.968 |
25.375 |
25.783 |
25.961 |
26.987 |
|
其它美制螺纹 |
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|
9/16″×16UN |
14.252 |
14.013 |
13.221 |
13.101 |
12.36 |
12.573 |
12.929 |
13.256 |
13.411 |
14.288 |
|
7/8″×12UN |
22.182 |
21.892 |
20.808 |
20.668 |
19.662 |
19.939 |
20.396 |
20.851 |
21.034 |
22.225 |
|
2-1/4″×12UN |
57.104 |
56.815 |
55.73 |
55.575 |
54.585 |
54.864 |
55.321 |
55.776 |
55.976 |
57.15 |
|
注：UNC粗牙螺纹系列，UNF细牙螺纹系列， UNEF超细牙螺纹系列， UN不变螺距系列 |
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布锥管螺纹基本尺寸及公差(牙形角60º) NPT
|
螺纹代号 |
基面上的直径 |
螺纹长度 |
|||
|
大径 |
中径 |
小径 |
有效长度 |
管端至基面长 |
|
|
Z1/8″×27 |
10.272 |
9.519 |
8.766 |
7 |
4.572 |
|
Z1/4″×18 |
13.572 |
12.443 |
11.314 |
9.5 |
5.080 |
|
Z3/8″×18 |
17.055 |
15.926 |
14.797 |
10.5 |
6.096 |
|
Z1/2″×14 |
21.223 |
19.772 |
18.321 |
13.5 |
8.028 |
|
Z3/4″×14 |
26.568 |
25.117 |
23.666 |
14 |
8.611 |
|
Z1″×11.5 |
33.228 |
31.461 |
29.694 |
17.5 |
10.160 |
|
Z1.1/4″×11.5 |
41.985 |
40.218 |
38.451 |
18 |
10.688 |
|
Z1.1/2″×11.5 |
48.054 |
46.287 |
44.520 |
18.5 |
10.688 |
|
Z2″×11.5 |
60.092 |
58.325 |
56.558 |
19 |
11.074 |
