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1、美制內(nèi)螺紋（2B）常用規(guī)格極限尺寸表（粗牙）?UNC公稱尺寸和每英寸牙數(shù)小徑極限最小??最大中徑極限最小?最大大徑min底孔直徑最小??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.底孔直徑指攻絲前鉆孔直徑，鑄鐵、黃銅等較軟料取小值，鋼、青銅等較硬料取大值。2.標記示例：10-24
6、UNC-2B(或0.190-24UNC-2B)、3/8-16UNC-2B(或0.375-16UNC-2B)????????????????美制內(nèi)螺紋（2B）常用規(guī)格極限尺寸表（細牙）UNF???公稱尺寸和?小徑極限??中徑極限??大徑min??底孔直徑?每英寸牙數(shù)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
