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细牙、中等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 |
0.0051 |
0.1813 |
0.1875 |
0.1664 |
0.0033 |
0.1631 |
0.1675 |
0.1464 |
0.0068 |
0.1396 |
0.1475 |
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7/32 |
28 |
0.2177 |
0.0055 |
0.2122 |
0.2188 |
0.1948 |
0.0036 |
0.1912 |
0.1959 |
0.1719 |
0.0074 |
0.1645 |
0.1730 |
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1/4 |
26 |
0.2489 |
0.0057 |
0.2432 |
0.2500 |
0.2243 |
0.0037 |
0.2206 |
0.2254 |
0.1997 |
0.0076 |
0.1921 |
0.2008 |
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9/32 |
26 |
0.2800 |
0.0059 |
0.2741 |
0.2812 |
0.2554 |
0.0039 |
0.2515 |
0.2566 |
0.2308 |
0.0078 |
0.2230 |
0.2320 |
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5/16 |
22 |
0.3113 |
0.0062 |
0.3051 |
0.3125 |
0.2822 |
0.0041 |
0.2781 |
0.2834 |
0.2531 |
0.0084 |
0.2447 |
0.2543 |
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3/8 |
20 |
0.3737 |
0.0066 |
0.3671 |
0.3750 |
0.3417 |
0.0044 |
0.3373 |
0.3430 |
0.3097 |
0.0089 |
0.3008 |
0.3110 |
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7/16 |
18 |
0.4361 |
0.0071 |
0.4290 |
0.4375 |
0.4005 |
0.0047 |
0.3958 |
0.4019 |
0.3649 |
0.0094 |
0.3555 |
0.3663 |
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1/2 |
16 |
0.4985 |
0.0075 |
0.4910 |
0.5000 |
0.4585 |
0.0050 |
0.4535 |
0.4600 |
0.4185 |
0.0100 |
0.4085 |
0.4200 |
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9/16 |
16 |
0.5610 |
0.0077 |
0.5533 |
0.5625 |
0.5210 |
0.0052 |
0.5158 |
0.5225 |
0.4810 |
0.0102 |
0.4708 |
0.4825 |
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5/8 |
14 |
0.6234 |
0.0081 |
0.6153 |
0.6250 |
0.5777 |
0.0054 |
0.5793 |
0.5793 |
0.5320 |
0.0107 |
0.5213 |
0.5336 |
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11/16 |
14 |
0.6858 |
0.0083 |
0.6775 |
0.6875 |
0.6401 |
0.0056 |
0.6418 |
0.6418 |
0.5944 |
0.0109 |
0.5835 |
0.5961 |
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3/4 |
12 |
0.7482 |
0.0088 |
0.7394 |
0.7500 |
0.6948 |
0.0059 |
0.6966 |
0.6966 |
0.6414 |
0.0117 |
0.6297 |
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 |
0.0092 |
0.8658 |
0.8168 |
0.0062 |
0.8106 |
0.7586 |
0.0122 |
0.7464 |
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1 |
10 |
1.0000 |
0.0098 |
0.9902 |
0.9360 |
0.0066 |
0.9294 |
0.8720 |
0.0129 |
0.8591 |
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11/8 |
9 |
1.1250 |
0.0102 |
1.1148 |
1.0539 |
0.0069 |
1.0470 |
0.9828 |
0.0136 |
0.9692 |
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11/4 |
9 |
1.2500 |
0.0105 |
1.2395 |
1.1789 |
0.0072 |
1.1717 |
1.1078 |
0.0139 |
1.0939 |
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13/8 |
8 |
1.3750 |
0.0110 |
1.3640 |
1.2950 |
0.0075 |
1.2875 |
1.2150 |
0.0146 |
1.2004 |
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11/2 |
8 |
1.5000 |
0.0112 |
1.4888 |
1.4200 |
0.0077 |
1.4123 |
1.3400 |
0.0148 |
1.3252 |
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15/8 |
8 |
1.6250 |
0.0115 |
1.6135 |
1.5450 |
0.0079 |
1.5371 |
1.4650 |
0.0150 |
1.4500 |
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13/4 |
7 |
1.7500 |
0.0120 |
1.7380 |
1.6585 |
0.0083 |
1.6502 |
1.5670 |
0.0158 |
1.5512 |
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2 |
7 |
2.0000 |
0.0124 |
1.9876 |
1.9085 |
0.0087 |
1.8998 |
1.8170 |
0.0162 |
1.8008 |
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21/4 |
6 |
2.2500 |
0.0132 |
2.2368 |
2.1433 |
0.0092 |
2.1341 |
2.0366 |
0.0173 |
2.0193 |
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21/2 |
6 |
2.5000 |
0.0136 |
2.4864 |
2.3933 |
0.0095 |
2.3838 |
2.2866 |
0.0177 |
2.2689 |
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23/4 |
6 |
2.7500 |
0.0139 |
2.7361 |
2.6433 |
0.0098 |
2.6335 |
2.5366 |
0.0180 |
2.5186 |
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3 |
5 |
3.0000 |
0.0148 |
2.9852 |
2.8719 |
0.0103 |
2.8616 |
2.7438 |
0.0193 |
2.7245 |
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