美制螺纹标准(粗细牙螺纹)

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1、美制内螺纹（2B）常用规格极限尺寸表（粗牙） UNC公称尺寸和每英寸牙数小径极限最小  最大中径极限最小 最大大径min底孔直径最小  最大8-32  UNC(0.164-32)0.1300  0.13903.3020  3.53060.1437  0.14753.6500  3.74650.16404.16563.40  3.5010-24(0.190-24)0.1450  0.15603.6830  3.96240.1629  0.16724.1377  4.24690.19004.8260   3.75  3.9012-24(0.216-2

2、4)0.1710  0.18104.3434  4.59740.1889  0.19334.7981  4.90980.21605.48644.40  4.551/4-20(0.250-20)0.1960  0.20704.9784  5.25780.2175  0.22245.5245  5.64900.25006.35005.05  5.205/16-18(0.3175-18)0.2520  0.26506.4008 6.73100.2764  0.28177.0206  7.15520.31257.93756.45  6.603/8-16(

3、0.375-16)0.3070 0.32107.7978  8.15340.3344  0.34018.4938  8.63850.37509.52507.85  8.007/16-14(0.4375-14)0.3600  0.37609.1440  9.55040.3911  0.39729.9339 10.08890.437511.11259.20  9.401/2-13(0.50-13)0.4170  0.434010.591811.02360.4500  0.456511.4300 11.59510.500012.700010.65  1

4、0.909/16-12(0.5625-12)0.4720  0.490011.988812.44600.5084  0.515212.9134 13.08610.562514.287512.05  12.305/8-11(0.625-11)0.5270  0.546013.38583.86840.5660  0.573214.3764 14.55930.625015.875013.45  13.703/4-10(0.750-10)0.6420  0.663016.3068 16.84020.6850  0.692717.3990  17.5946

5、0.750019.050016.40  16.707/8-9(0.875-9)0.7550  0.778019.1770 19.76120.8028  0.811020.3911  20.59940.875022.2250    19.30  19.601"-8(1.000-8)0.8650  0.890021.9710  22.60600.9188  0.927623.3375 23.56101.000025.400022.10  22.401.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：10-24

6、UNC-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）UNF   公称尺寸和 小径极限  中径极限  大径min  底孔直径 每英寸牙数最小  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    0.15

7、60  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)

8、    5.3594 5.5880 5.7607 5.8699  6.3500    5/16-24    0.2670  0.2770