美制螺纹标准对照表
美制螺纹标准对照表
| |美制外螺纹（2A）常用规格极限尺寸表（粗牙） | |
| 公称尺寸和每英寸牙数 |螺纹系列代号 |大径极限 |中径极限 |小径max |螺胚直径 |
| | |
|2.标记示例：10-24UNC-2A(或0.190-24UNC-2A)、3/8-16UNC-2A(或0.375-16UNC-2A) |
|（注：表中上行斜体数值单位为英寸，下行为毫米） |
| |
| |美制外螺纹（2A）常用规格极限尺寸表（细牙） | |
|公称尺寸和每英寸牙数|螺纹系列代号 |大径极限 |中径极限 |小径max |螺胚直径 |
| | |
|2.标记示例：10-32UNF-2A(或0.190-32UNF-2A)、3/8-24UNF-2A(或0.375-24UNF-2A) |
| |美制内螺纹（2B）常用规格极限尺寸表（粗牙） | |
|公称尺寸和每英寸牙数 |螺纹系列代号 |小径极限 |中径极限 |大径min |底孔直径 |
| |
|2.标记示例：10-24UNC-2B(或0.190-24UNC-2B)、3/8-16UNC-2B(或0.375-16UNC-2B) |
| |美制内螺纹（2B）常用规格极限尺寸表（细牙） | |
|公称尺寸和每英寸牙数 |螺纹系列代号 |小径极限 |中径极限 |大径min |底孔直径 |
| |最小 |最大 |最小 |最大 | |最小 |最大 | | 8-36 |UNF |0.1340 |0.1420 |0.1460 |0.1496 |0.1640 |3.45 |3.67 | |(0.164-36) | |3.4036 |3.6068 |3.7084 |3.7998 |4.1656 | | | | 10-32 | |0.1560 |0.1640 |0.1697 |0.1736 |0.1900 |4.00 |4.27 | |(0.190-32) | |3.9624 |4.1656 |4.3104 |4.4094 |4.8260 | | | | 12-28 | |0.1770 |0.1860 |0.1928 |0.1970 |0.2160 |4.55 |4.85 | |(0.216-28) | |4.4958 |4.7244 |4.8971 |5.0038 |5.4864 | | | | 1/4-28 | |0.2110 |0.2200 |0.2268 |0.2311 |0.2500 |5.40 |5.71 | |(0.250-28) | |5.3594 |5.5880 |5.7607 |5.8699 |6.3500 | | | | 5/16-24 | |0.2670 |0.2770 |0.2854 |0.2902 |0.3125 |6.85 |7.20 | |(0.3175-24) | |6.7818 |7.0358 |7.2492 |7.3711 |7.9375 | | | | 3/8-24 | |0.3300 |0.3400 |0.3479 |0.3528 |0.3750 |8.45 |8.78 | |(0.375-24) | |8.3820 |8.6360 |8.8367 |8.9611 |9.5250 | | | | 7/16-20 | |0.3830 |0.3950 |0.4050 |0.4104 |0.4375 |9.85 |10.23 | |(0.4375-20) | |9.7282 |10.0330 |10.2870 |10.4242 |11.1125 | | | | 1/2-20 | |0.4460 |0.4570 |0.4675 |0.4731 |0.5000 |11.40 |11.82 | |(0.50-20) | |11.3284 |11.6078 |11.8745 |12.0167 |12.7000 | | | |9/16-18 | |0.5020 |0.5150 |0.5264 |0.5323 |0.5625 |12.85 |13.31 | |(0.5625-18) | |12.7508 |13.0810 |13.3706 |13.5204 |14.2875 | | | | 5/8-18 | |0.5650 |0.5780 |0.5889 |0.5949 |0.6250 |14.45 |14.89 | |(0.625-18) | |14.3510 |14.6812 |14.9581 |15.1105 |15.8750 | | | | 3/4-16 | |0.6820 |0.6960 |0.7094 |0.7159 |0.7500 |17.40 |17.95 | |(0.750-16) | |17.3228 |17.6784 |18.0188 |18.1839 |19.0500 | | | | 7/8-14 | |0.7980 |0.8140 |0.8286 |0.8356 |0.8750 |20.35 |20.97 | |(0.875-14) | |20.2692 |20.6756 |21.0464 |21.2242 |22.2250 | | | |1"-12 | |0.9100 |0.9280 |0.9459 |0.9535 |1.0000 |23.90 |23.95 | |(1.000-12) | |23.1140 |23.5712 |24.0259 |24.2189 |25.4000 | | | | | | | | | | | | | |
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