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细牙、自由级外螺纹的公差和极限尺寸 in |
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(a)公称直径小于和等于3/4in |
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公称直径 |
牙数 |
大 径 |
中 径 |
小 径 |
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不镀或镀前 |
镀后 |
不镀或镀前 |
镀后 |
不镀或镀前 |
镀后 |
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max |
公差 |
min |
max |
max |
公差 |
min |
max |
max |
公差 |
min |
max |
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3/16 |
32 |
0.1864 |
0.0068 |
0.1796 |
0.1875 |
0.1664 |
0.0050 |
0.1614 |
0.1675 |
0.1464 |
0.0085 |
0.1379 |
0.1475 |
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7/32 |
28 |
0.2177 |
0.0072 |
0.2105 |
0.2188 |
0.1948 |
0.0053 |
0.1895 |
0.1959 |
0.1719 |
0.0091 |
0.1628 |
0.1730 |
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1/4 |
26 |
0.2489 |
0.0076 |
0.2413 |
0.2500 |
0.2243 |
0.0056 |
0.2187 |
0.2254 |
0.1997 |
0.0095 |
0.1902 |
0.2008 |
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9/32 |
26 |
0.2800 |
0.0078 |
0.2722 |
0.2812 |
0.2554 |
0.0058 |
0.2496 |
0.2566 |
0.2308 |
0.0097 |
0.2211 |
0.2320 |
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5/16 |
22 |
0.3113 |
0.0083 |
0.3030 |
0.3125 |
0.2822 |
0.0062 |
0.2760 |
0.2834 |
0.2531 |
0.0105 |
0.2426 |
0.2543 |
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3/8 |
20 |
0.3737 |
0.0088 |
0.3649 |
0.3750 |
0.3417 |
0.0066 |
0.3351 |
0.3430 |
0.3097 |
0.0111 |
0.2986 |
0.3110 |
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7/16 |
18 |
0.4361 |
0.0094 |
0.4267 |
0.4375 |
0.4005 |
0.0070 |
0.3935 |
0.4019 |
0.3649 |
0.0117 |
0.3532 |
0.3663 |
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1/2 |
16 |
0.4985 |
0.0099 |
0.4886 |
0.5000 |
0.4585 |
0.0074 |
0.4511 |
0.4600 |
0.4185 |
0.0124 |
0.4061 |
0.4200 |
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9/16 |
16 |
0.5610 |
0.0102 |
0.5508 |
0.5625 |
0.5210 |
0.0077 |
0.5133 |
0.5225 |
0.4810 |
0.0127 |
0.4683 |
0.4825 |
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5/8 |
14 |
0.6234 |
0.0108 |
0.6126 |
0.6250 |
0.5777 |
0.0081 |
0.5696 |
0.5793 |
0.5320 |
0.0134 |
0.5186 |
0.5336 |
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11/16 |
14 |
0.6858 |
0.0111 |
0.6747 |
0.6875 |
0.6401 |
0.0084 |
0.6317 |
0.6418 |
0.5944 |
0.0137 |
0.5807 |
0.5961 |
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3/4 |
12 |
0.7482 |
0.0117 |
0.7365 |
0.7500 |
0.6948 |
0.0088 |
0.6860 |
0.6966 |
0.6414 |
0.0146 |
0.6268 |
0.6432 |
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(b)公称直径大于3/4in |
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公称 直径 |
牙数 |
大 径 |
中 径 |
小 径 |
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max |
公差 |
min |
max |
公差 |
min |
max |
公差 |
min |
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7/8 |
11 |
0.8750 |
0.0123 |
0.8627 |
0.8168 |
0.0093 |
0.8075 |
0.7586 |
0.0153 |
0.7433 |
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1 |
10 |
1.0000 |
0.0131 |
0.9869 |
0.9360 |
0.0099 |
0.9261 |
0.8720 |
0.0162 |
0.8558 |
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11/8 |
9 |
1.1250 |
0.0137 |
1.1113 |
1.0539 |
0.0104 |
1.0435 |
0.9828 |
0.0171 |
0.9657 |
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11/4 |
9 |
1.2500 |
0.0141 |
1.2359 |
1.1789 |
0.0108 |
1.1681 |
1.1078 |
0.0175 |
1.0903 |
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13/8 |
8 |
1.3750 |
0.0148 |
1.3602 |
1.2950 |
0.0113 |
1.2837 |
1.2150 |
0.0184 |
1.1966 |
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11/2 |
8 |
1.5000 |
0.0151 |
1.4849 |
1.4200 |
0.0116 |
1.4084 |
1.3400 |
0.0187 |
1.3213 |
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15/8 |
8 |
1.6250 |
0.0155 |
1.6095 |
1.5450 |
0.0119 |
1.5331 |
1.4650 |
0.0190 |
1.4460 |
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13/4 |
7 |
1.7500 |
0.0162 |
1.7338 |
1.6585 |
0.0124 |
1.6461 |
1.5670 |
0.0200 |
1.5470 |
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2 |
7 |
2.0000 |
0.0168 |
1.9832 |
1.9085 |
0.0130 |
1.8955 |
1.8170 |
0.0205 |
1.7932 |
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21/4 |
6 |
2.2500 |
0.0178 |
2.2322 |
2.1433 |
0.0137 |
2.1296 |
2.0366 |
0.0219 |
2.0147 |
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21/2 |
6 |
2.5000 |
0.0183 |
2.4817 |
2.3933 |
0.0142 |
2.3791 |
2.2866 |
0.0224 |
2.2642 |
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23/4 |
6 |
2.7500 |
0.0188 |
2.7312 |
2.6433 |
0.0147 |
2.6286 |
2.5366 |
0.0229 |
2.5137 |
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3 |
5 |
3.0000 |
0.0199 |
2.9801 |
2.8719 |
0.0155 |
2.8564 |
2.7438 |
0.0244 |
2.7194 |
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