資源描述：
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1、美制外螺紋（2A）常用規(guī)格極限尺寸表（粗牙）????公稱尺寸和每英寸牙數(shù)????螺紋系列代號(hào)????大徑極限????中徑極限????小徑max????螺胚直徑????????最小????最大????最小????最大????????最小????最大8-32????UNC????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????????10-24????????0.1818????
2、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????????12-24????????0.2078????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????????1/4-20????????0.2408????
3、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????????5/16-18????????0.3026????0.3113????0.2712????0.2752????0.2431????6.94????6.98(0.3125-18)????????7.6860????7.9070????6.8885????6.9901????6.1747????????3/8-16????????0.3643?
4、???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????????7/16-14????????0.4258????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????????1/2-13????????0.
5、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????????9/16-12????????0.5495????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????????
6、5/8-11????????0.6113????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????????3/4-10????????0.7353????0.7482????0.6773????0.6832????0.6255????17.28????17.33(0.750-10)????????18.6766????19.0043????17.2034????17.3533????
7、15.8877????????7/8-9????????0.8592????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"-8????????0.9830????0.9980????0.9100????0.9168????0.8446????
