美制外螺纹常用规格尺寸表.doc

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螺胚直径最小最大最小最大最小最大 8-32UNC 0.1571 0.1631 0.1399 0.1428 0.1248 3.58 3.61 (0.164-32)3.9903 4.1427 3.5535 3.6271 3.1699 10-240.1818 0.1890 0.1586 0.1619 0.1379 4.07 4.10 (0.190-24)4.6177 4.8006 4.0284 4.1123 3.5027 12-240.2078 0.2150 0.1845 0.1879 0.1639 4.72 4.75 (0.216-24)5.2781 5.4610 4.6863 4.7727 4.1631 1/4-200.2408 0.2489 0.2127 0.2164 0.1876 5.45 5.48 (0.250-20)6.1163 6.3221 5.4026 5.4966 4.7650 5/16-180.3026 0.3113 0.2712 0.2752 0.2431 6.94 6.98 (0.3175-18)7.6860 7.9070 6.8885 6.9901 6.1747 3/8-160.3643 0.3737 0.3287 0.3331 0.2970 8.40 8.44 (0.375-16)9.2532 9.4920 8.3490 8.4607 7.5438 7/16-140.4258 0.4361 0.3850 0.3897 0.3485 9.83 9.87 (0.4375-14)10.8153 11.0769 9.7790 9.8984 8.8519 1/2-130.4876 0.4985 0.4435 0.4485 0.4041 11.34 11.38 (0.50-13)12.3850 12.6619 11.2649 11.3919 10.2641 9/16-120.5495 0.5609 0.5016 0.5068 0.4587 12.80 12.84 (0.5625-12)13.9573 14.2469 12.7406 12.8727 11.6510 5/8-110.6113 0.6234 0.5589 0.5644 0.5119 14.27 14.32 (0.625-11)15.5270 15.8344 14.1961 14.3358 13.0023 3/4-100.7353 0.7482 0.6773 0.6832 0.6255 17.28 17.33 (0.750-10)18.6766 19.0043 17.2034 17.3533 15.8877 7/8-90.8592 0.8731 0.7946 0.8009 0.7368 20.27 20.32 (0.875-9)21.8237 22.1767 20.1828 20.3429 18.7147 1-80.9830 0.9980 0.9100 0.9168 0.8446 23.22 23.27 (1.000-8)24.9682 25.3492 23.1140 23.2867 21.4528 1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。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，下行乘25.4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螺胚直径最小最大最小最大最小最大 8-36UNF0.1577 0.1632 0.1424 0.1452 0.1291 3.65 3.67 (0.164-36)4.0056 4.1453 3.6170 3.6881 3.2791 10-320.1831 0.1891 0.1658 0.1688 0.1508 4.24 4.27 (0.190-32)4.6507 4.8031 4.2113 4.2875 3.8303 12-280.2085 0.2150 0.1886 0.1918 0.1712 4.82 4.85 (0.216-28)5.2959 5.4610 4.7904 4.8717 4.3485 1/4-280.2425 0.2490 0.2225 0.2258 0.2052 5.69 5.71 (0.250-28)6.1595 6.3246 5.6515 5.7353 5.2121 5/16-240.3042 0.3114 0.2806 0.2843 0.2603 7.17 7.20 (0.3175-24)7.7267 7.9096 7.1272 7.2212 6.6116 3/8-240.3667 0.3739 0.3430 0.3468 0.3228 8.75 8.78 (0.375-24)9.3142 9.4971 8.7122 8.8087 8.1991 7/16-200.4281 0.4362 0.3995 0.4037 0.3749 10.19 10.23 (0.4375-20)10.8737 11.0795 10.1473 10.2540 9.5225 1/2-200.4906 0.4987 0.4619 0.4662 0.4374 11.78 11.82 (0.50-20)12.4612 12.6670 11.7323 11.8415 11.1100 9/16-180.5524 0.5611 0.5205 0.5250 0.4929 13.27 13.31 (0.5625-18)14.0310 14.2519 13.2207 13.3350 12.5197 5/8-180.6149 0.6236 0.5828 0.5875 0.5554 14.85 14.89 (0.625-18)15.6185 15.8394 14.8031 14.9225 14.1072 3/4-160.7391 0.7485 0.7029 0.7079 0.6718 17.91 17.95 (0.750-16)18.7731 19.0119 17.8537 17.9807 17.0637 7/8-140.8631 0.8734 0.8216 0.8270 0.7858 20.93 20.97 (0.875-14)21.9227 22.1844 20.8686 21.0058 19.9593 1-120.9868 0.9982 0.9382 0.9441 0.8960 23.90 23.95 (1.000-12)25.0647 25.3543 23.8303 23.9801 22.7584 1.螺胚直径指滚丝前的尺寸，数值为依经验公式计算而得，在实践中需验证。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底孔直径最小最大最小最大最小最大 8-32UNC 0.1300 0.1390 0.1437 0.1475 0.1640 3.40 3.50 (0.164-32)3.3020 3.5306 3.6500 3.7465 4.1656 10-240.1450 0.1560 0.1629 0.1672 0.1900 3.75 3.90 (0.190-24)3.6830 3.9624 4.1377 4.2469 4.8260 12-240.1710 0.1810 0.1889 0.1933 0.2160 4.40 4.55 (0.216-24)4.3434 4.5974 4.7981 4.9098 5.4864 1/4-200.1960 0.2070 0.2175 0.2224 0.2500 5.05 5.20 (0.250-20)4.9784 5.2578 5.5245 5.6490 6.3500 5/16-180.2520 0.2650 0.2764 0.2817 0.3125 6.45 6.60 (0.3175-18)6.4008 6.7310 7.0206 7.1552 7.9375 3/8-160.3070 0.3210 0.3344 0.3401 0.3750 7.85 8.00 (0.375-16)7.7978 8.1534 8.4938 8.6385 9.5250 7/16-140.3600 0.3760 0.3911 0.3972 0.4375 9.20 9.40 (0.4375-14)9.1440 9.5504 9.9339 10.0889 11.1125 1/2-130.4170 0.4340 0.4500 0.4565 0.5000 10.65 10.90 (0.50-13)10.5918 11.0236 11.4300 11.5951 12.7000 9/16-120.4720 0.4900 0.5084 0.5152 0.5625 12.05 12.30 (0.5625-12)11.9888 12.4460 12.9134 13.0861 14.2875 5/8-110.5270 0.5460 0.5660 0.5732 0.6250 13.45 13.70 (0.625-11)13.3858 13.8684 14.3764 14.5593 15.8750 3/4-100.6420 0.6630 0.6850 0.6927 0.7500 16.40 16.70 (0.750-10)16.3068 16.8402 17.3990 17.5946 19.0500 7/8-90.7550 0.7780 0.8028 0.8110 0.8750 19.30 19.60 (0.875-9)19.1770 19.7612 20.3911 20.5994 22.2250 1-80.8650 0.8900 0.9188 0.9276 1.0000 22.10 22.40 (1.000-8)21.9710 22.6060 23.3375 23.5610 25.4000 1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。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 8-36UNF0.1340 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 10-320.1560 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 12-280.1770 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 1/4-280.2110 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 5/16-240.2670 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 3/8-240.3300 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 7/16-200.3830 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 1/2-200.4460 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 9/16-180.5020 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 5/8-180.5650 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 3/4-160.6820 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 7/8-140.7980 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 1-120.9100 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 1.底孔直径指攻丝前钻孔直径，铸铁、黄铜等较软料取小值，钢、青铜等较硬料取大值。2.标记示例：10-32UNF-2B(或0.190-32UNF-2B)、3/8-24UNF-2B(或0.375-24UNF-2B)