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PT螺纹尺寸 mm |
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螺纹 尺寸 代号 |
牙 型 |
基准平面内直径 |
基准平面位置1) |
圆柱内 螺纹直 径公差 |
最小有效螺纹长度2) |
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牙数 n |
螺距 P |
牙高 h |
圆弧 半径 r |
大径 d，D |
中径 d2，D2 |
小径 d1，D1 |
外螺纹 |
内螺纹 |
外螺纹 |
内螺纹 |
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基距 a |
公差 b |
公差 c |
公差 b |
带不完 整螺纹 |
带退 刀槽 |
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圆锥 |
圆柱 |
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l |
l' |
t |
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PT1/8 |
28 |
0.907 1 |
0.581 |
0.12 |
9.728 |
9.147 |
8.566 |
3.97 |
±0.91 |
±1.13 |
±0.071 |
2.5 |
6.2 |
7.4 |
4.4 |
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PT1/4 |
19 |
1.336 8 |
0.856 |
0.18 |
13.157 |
12.301 |
11.445 |
6.01 |
±1.34 |
±1.67 |
±0.104 |
3.7 |
9.4 |
11.0 |
6.7 |
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PT3/8 |
19 |
1.336 8 |
0.856 |
0.18 |
16.662 |
15.806 |
14.950 |
6.35 |
±1.34 |
±1.67 |
±0.104 |
3.7 |
9.7 |
11.4 |
7.0 |
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PT1/2 |
14 |
1.814 3 |
1.162 |
0.25 |
20.955 |
19.793 |
18.631 |
8.16 |
±1.81 |
±2.27 |
±0.142 |
5.0 |
12.7 |
15.0 |
9.1 |
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PT3/4 |
14 |
1.814 3 |
1.162 |
0.25 |
26.441 |
25.279 |
24.117 |
9.53 |
±1.81 |
±2.27 |
±0.142 |
5.0 |
14.1 |
16.3 |
10.2 |
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PT1 |
11 |
2.309 1 |
1.479 |
0.32 |
33.249 |
31.770 |
30.291 |
10.39 |
±2.31 |
±2.89 |
±0.181 |
6.4 |
16.2 |
19.1 |
11.6 |
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PT11/4 |
11 |
2.309 1 |
1.479 |
0.32 |
41.910 |
40.431 |
38.952 |
12.70 |
±2.31 |
±2.89 |
±0.181 |
6.4 |
18.5 |
21.4 |
13.4 |
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PT11/2 |
11 |
2.309 1 |
1.479 |
0.32 |
48.803 |
46.324 |
44.845 |
12.70 |
±2.31 |
±2.89 |
±0.181 |
6.4 |
18.5 |
21.4 |
13.4 |
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PT2 |
11 |
2.309 1 |
1.479 |
0.32 |
59.614 |
58.135 |
56.656 |
15.88 |
±2.31 |
±2.89 |
±0.181 |
7.5 |
22.8 |
25.7 |
16.9 |
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PT21/2 |
11 |
2.309 1 |
1.479 |
0.32 |
75.184 |
73.705 |
72.226 |
17.46 |
±3.46 |
±3.46 |
±0.216 |
9.2 |
26.7 |
30.1 |
18.6 |
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PT3 |
11 |
2.309 1 |
1.479 |
0.32 |
87.884 |
86.405 |
84.926 |
20.64 |
±3.46 |
±3.46 |
±0.216 |
9.2 |
29.8 |
33.3 |
21.1 |
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PT31/2 |
11 |
2.309 1 |
1.479 |
0.32 |
100.330 |
98.851 |
97.372 |
22.23 |
±3.46 |
±3.46 |
±0.216 |
9.2 |
31.4 |
34.9 |
22.4 |
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PT4 |
11 |
2.309 1 |
1.479 |
0.32 |
113.030 |
111.551 |
110.072 |
25.40 |
±3.46 |
±3.46 |
±0.216 |
10.4 |
35.8 |
39.3 |
25.9 |
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PT5 |
11 |
2.309 1 |
1.479 |
0.32 |
138.430 |
136.951 |
135.472 |
28.58 |
±3.46 |
±3.46 |
±0.216 |
11.5 |
40.1 |
43.5 |
29.3 |
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PT6 |
11 |
2.309 1 |
1.479 |
0.32 |
163.830 |
162.351 |
160.872 |
28.58 |
±3.46 |
±3.46 |
±0.216 |
11.5 |
40.1 |
43.5 |
29.3 |
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PT7 |
11 |
2.309 1 |
1.479 |
0.32 |
189.230 |
187.751 |
186.272 |
34.93 |
±5.08 |
±5.08 |
±0.318 |
14.0 |
48.9 |
54.0 |
35.1 |
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PT8 |
11 |
2.309 1 |
1.479 |
0.32 |
214.630 |
213.151 |
211.672 |
38.10 |
±5.08 |
±5.08 |
±0.318 |
14.0 |
52.1 |
57.2 |
37.6 |
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PT9 |
11 |
2.309 1 |
1.479 |
0.32 |
240.030 |
238.551 |
237.072 |
38.10 |
±5.08 |
±5.08 |
±0.318 |
14.0 |
52.1 |
57.2 |
37.6 |
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PT10 |
11 |
2.309 1 |
1.479 |
0.32 |
265.430 |
263.951 |
262.472 |
41.28 |
±5.08 |
±5.08 |
±0.318 |
14.0 |
55.3 |
60.4 |
40.2 |
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PT12 |
11 |
2.309 1 |
1.479 |
0.32 |
316.230 |
314.751 |
313.272 |
41.28 |
±6.35 |
±6.35 |
±0.397 |
17.5 |
58.8 |
65.1 |
41.9 |
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1) 日本标准的某些数值精度(小数点后的保留位数)比ISO标准的多一位。 2) ISO和中国的标准尺寸表内直接给出了外螺纹的三种最小有效螺纹长度值，没有给内螺纹的最小有效螺纹长度值。日本标准则分三种情况直接给出了内螺纹的最小有效螺纹长度(l、l'和t)。其中：l'与表英制密封管螺纹的基本尺寸及其公差的第16栏值相同(a＋b＋f)；l＝l'－c；t等于表英制密封管螺纹的基本尺寸及其公差第17栏值的80%[0.8(a－b＋f)]。日本内螺纹最小有效螺纹长度来源于BS 21:1985标准。注意：这种内螺纹最小有效螺纹长度算法还没有得到世界公认。内螺纹最小有效螺纹长度计算方法直接取决于各个国家的机械加工水平，英国和日本的计算方法不一定适合其他国家。日本标准没有给出外螺纹的三种最小有效螺纹长度值，使用者可以选用ISO 标准和我国标准的规定数值或自己计算最小有效螺纹长度值(实际基准距离＋装配余量)。 |