计算选型
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美制一般密封管螺纹的基本尺寸 |
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美制一般密封圆锥外螺纹上轴向尺寸的分布位置图 |
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尺寸 代号 |
牙数 n |
螺距 P |
牙型 高度 h |
基准平面内的基本直径 |
基准距离 L1 |
装配余量 L3 |
外螺纹 小端面 内的基 本小径 |
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|
大径 d＝D |
中径 d1＝D2 |
小径 d1＝D1 |
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|
mm |
圈数 |
mm |
圈数 |
mm |
mm |
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|
1/16 |
27 |
0.941 |
0.752 |
7.894 |
7.142 |
6.389 |
4.32 |
4.064 |
3 |
2.822 |
6.137 |
|
1/8 |
27 |
0.941 |
0.752 |
10.242 |
9.489 |
8.737 |
4.36 |
4.102 |
3 |
2.822 |
8.481 |
|
1/4 |
18 |
1.411 |
1.129 |
13.616 |
12.487 |
11.358 |
4.10 |
5.785 |
3 |
4.233 |
10.996 |
|
3/8 |
18 |
1.411 |
1.129 |
17.055 |
15.926 |
14.797 |
4.32 |
6.096 |
3 |
4.233 |
14.417 |
|
1/2 |
14 |
1.814 |
1.451 |
21.224 |
19.772 |
18.321 |
4.48 |
8.128 |
3 |
5.443 |
17.813 |
|
3/4 |
14 |
1.814 |
1.451 |
26.569 |
25.117 |
23.666 |
4.75 |
8.618 |
3 |
5.443 |
23.127 |
|
1 |
11.5 |
2.209 |
1.767 |
33.228 |
31.461 |
29.694 |
4.60 |
10.160 |
3 |
6.626 |
29.060 |
|
11/4 |
11.5 |
2.209 |
1.767 |
41.985 |
40.218 |
38.451 |
4.83 |
10.668 |
3 |
6.626 |
37.785 |
|
11/2 |
11.5 |
2.209 |
1.767 |
48.054 |
46.287 |
44.520 |
4.83 |
10.668 |
3 |
6.626 |
43.853 |
|
2 |
11.5 |
2.209 |
1.767 |
60.092 |
58.325 |
56.558 |
5.01 |
11.065 |
3 |
6.626 |
55.867 |
|
21/2 |
8 |
3.175 |
2.540 |
72.699 |
70.159 |
67.619 |
5.46 |
17.335 |
2 |
6.350 |
66.535 |
|
3 |
8 |
3.175 |
2.540 |
88.608 |
86.068 |
83.528 |
6.13 |
49.463 |
2 |
6.350 |
82.311 |
|
31/2 |
8 |
3.175 |
2.540 |
101.316 |
98.776 |
96.236 |
6.57 |
20.860 |
2 |
6.350 |
94.932 |
|
4 |
8 |
3.175 |
2.540 |
113.973 |
111.433 |
108.893 |
6.75 |
21.431 |
2 |
6.350 |
107.554 |
|
5 |
8 |
3.175 |
2.540 |
140.952 |
138.412 |
135.872 |
7.50 |
23.812 |
2 |
6.350 |
134.384 |
|
6 |
8 |
3.175 |
2.540 |
167.792 |
165.252 |
162.712 |
7.66 |
24.320 |
2 |
6.350 |
161.191 |
|
8 |
8 |
3.175 |
2.540 |
218.441 |
215.901 |
213.361 |
8.50 |
26.988 |
2 |
6.350 |
211.673 |
|
10 |
8 |
3.175 |
2.540 |
272.312 |
269.772 |
267.232 |
9.68 |
30.734 |
2 |
6.350 |
265.311 |
|
12 |
8 |
3.175 |
2.540 |
323.032 |
320.492 |
317.952 |
10.88 |
34.544 |
2 |
6.350 |
315.793 |
|
14O.D. |
8 |
3.175 |
2.540 |
354.904 |
352.364 |
349.824 |
12.50 |
39.688 |
2 |
6.350 |
347.345 |
|
16O.D. |
8 |
3.175 |
2.540 |
405.784 |
403.244 |
400.704 |
14.50 |
46.038 |
2 |
6.350 |
397.828 |
|
18O.D. |
8 |
3.175 |
2.540 |
456.565 |
454.025 |
451.485 |
16.00 |
50.800 |
2 |
6.350 |
448.310 |
|
20O.D. |
8 |
3.175 |
2.540 |
507.246 |
504.706 |
502.166 |
17.00 |
53.975 |
2 |
6.350 |
498.792 |
|
24O.D. |
8 |
3.175 |
2.540 |
608.608 |
606.068 |
603.528 |
19.00 |
60.325 |
2 |
6.350 |
599.758 |
|
注：1.可参照表中最右边一列数据选择攻丝前的麻花钻直径。 2.螺纹收尾长度(V)为3.47P。 3.O.D.是英文管子外径(outside diameter)的缩写。 其中：D2＝d2＝D-0.8P D1＝d1＝D-1.6P |
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