计算选型
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英制非密封管螺纹的基本尺寸及其极限偏差 mm |
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螺纹 尺寸 代号 |
牙数 n |
螺距 P |
牙高 h |
基本直径 |
中径公差1) |
小径公差 |
大径公差 |
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大径 d＝D |
中径 d2＝D2 |
小径 d1＝D1 |
内螺纹 |
外螺纹 |
内螺纹 |
外螺纹 |
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|
下偏差 |
上偏差 |
下偏差 |
上偏差 |
下偏差 |
上偏差 |
下偏差 |
上偏差 |
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A级 |
B级 |
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1/16 |
28 |
0.907 |
0.581 |
7.723 |
7.142 |
6.561 |
0 |
＋0.107 |
－0.107 |
－0.214 |
0 |
0 |
＋0.282 |
－0.214 |
0 |
|
1/8 |
28 |
0.907 |
0.581 |
9.728 |
9.147 |
8.566 |
0 |
＋0.107 |
－0.107 |
－0.214 |
0 |
0 |
＋0.282 |
－0.214 |
0 |
|
1/4 |
19 |
1.337 |
0.856 |
13.157 |
12.301 |
11.445 |
0 |
＋0.125 |
－0.125 |
－0.250 |
0 |
0 |
＋0.445 |
－0.250 |
0 |
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3/8 |
19 |
1.337 |
0.856 |
16.662 |
15.806 |
14.950 |
0 |
＋0.125 |
－0.125 |
－0.250 |
0 |
0 |
＋0.445 |
－0.250 |
0 |
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1/2 |
14 |
1.814 |
1.162 |
20.955 |
19.793 |
18.631 |
0 |
＋0.142 |
－0.142 |
－0.284 |
0 |
0 |
＋0.541 |
－0.284 |
0 |
|
5/8 |
14 |
1.814 |
1.162 |
22.911 |
21.749 |
20.587 |
0 |
＋0.142 |
－0.142 |
－0.284 |
0 |
0 |
＋0.541 |
－0.284 |
0 |
|
3/4 |
14 |
1.814 |
1.162 |
26.441 |
25.279 |
24.117 |
0 |
＋0.142 |
－0.142 |
－0.284 |
0 |
0 |
＋0.541 |
－0.284 |
0 |
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7/8 |
14 |
1.814 |
1.162 |
30.201 |
29.039 |
27.877 |
0 |
＋0.142 |
－0.142 |
－0.284 |
0 |
0 |
＋0.541 |
－0.284 |
0 |
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1 |
11 |
2.309 |
1.479 |
33.249 |
31.770 |
30.291 |
0 |
＋0.180 |
－0.180 |
－0.360 |
0 |
0 |
＋0.640 |
－0.360 |
0 |
|
11/8 |
11 |
2.309 |
1.479 |
37.897 |
36.418 |
34.939 |
0 |
＋0.180 |
－0.180 |
－0.360 |
0 |
0 |
＋0.640 |
－0.360 |
0 |
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11/4 |
11 |
2.309 |
1.479 |
41.910 |
40.431 |
38.952 |
0 |
＋0.180 |
－0.180 |
－0.360 |
0 |
0 |
＋0.640 |
－0.360 |
0 |
|
11/2 |
11 |
2.309 |
1.479 |
47.803 |
46.324 |
44.845 |
0 |
＋0.180 |
－0.180 |
－0.360 |
0 |
0 |
＋0.640 |
－0.360 |
0 |
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13/4 |
11 |
2.309 |
1.479 |
53.746 |
52.267 |
50.788 |
0 |
＋0.180 |
－0.180 |
－0.360 |
0 |
0 |
＋0.640 |
－0.360 |
0 |
|
2 |
11 |
2.309 |
1.479 |
59.614 |
58.135 |
56.656 |
0 |
＋0.180 |
－0.180 |
－0.360 |
0 |
0 |
＋0.640 |
－0.360 |
0 |
|
21/4 |
11 |
2.309 |
1.479 |
65.710 |
64.231 |
62.752 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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21/2 |
11 |
2.309 |
1.479 |
75.184 |
73.705 |
72.226 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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23/4 |
11 |
2.309 |
1.479 |
81.534 |
80.055 |
78.576 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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3 |
11 |
2.309 |
1.479 |
87.884 |
86.405 |
84.926 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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31/2 |
11 |
2.309 |
1.479 |
100.330 |
98.851 |
97.372 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
|
4 |
11 |
2.309 |
1.479 |
113.030 |
111.551 |
110.072 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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41/2 |
11 |
2.309 |
1.479 |
125.730 |
124.251 |
122.772 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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5 |
11 |
2.309 |
1.479 |
138.430 |
136.951 |
135.472 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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51/2 |
11 |
2.309 |
1.479 |
151.130 |
149.651 |
148.172 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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6 |
11 |
2.309 |
1.479 |
163.830 |
162.351 |
160.872 |
0 |
＋0.217 |
－0.217 |
－0.434 |
0 |
0 |
＋0.640 |
－0.434 |
0 |
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1)对薄壁件，此公差适用于平均中径，该中径是测量两个相互垂直直径的算术平均值。 其中：D2＝d2＝D－0.640 327 P； D1＝d1＝D－1.280 654 P |
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