螺纹底孔直径标准

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1、螺纹底孔直径表螺纹底孔直径表英制锥度管用螺纹管用螺纹规格JISB0203JISB0203JISB2301锥度内螺纹Rc(PT)平行管内螺纹Rp(PS)锥度管内螺纹计算数值底孔直径计算数值底孔直径计算数值底孔直径1/16‐286.236.26.496.5－－1/8‐288.2358.28.4958.58.1918.21/4‐19　10.94110.911.34111.410.94510.93/8‐1914.42814.414.84614.914.38814.41/2‐1417.951818.48918.517.943183/4‐1423.349232

2、3.9752423.305231‐1119.4232930.1113029.3532911/4‐1137.943838.7723937.893811/2‐1143.8334444.5654543.72432‐1155.4125556.4765655.4065521/2‐1170.7017172.0097270.788703‐1183.2018384.7098583.3648331/2‐1195.5479697.1559795.747954‐11107.834108109.855110108.3221085‐11133.11133135.255135

3、133.5971336‐11158.51159160.655161158.81158英制平行管用螺纹（G、PF）内螺纹最小径（参考）管用螺纹规格底孔钻头直径最大尺寸最小尺寸G1/16‐286.7G(PF)1/8‐288.7G(PF)1/4‐1911.7G(PF)3/8‐1915.2G(PF)1/2‐1419G(PF)5/8‐1421G(PF)3/4‐1424.5G(PF)7/8‐1428.2G(PF)1‐1130.6G(PF)11/8‐1135.2G(PF)11/4‐1139.2G(PF)11/2‐1145G(PF)13/4‐1151G(PF)2‐

4、1157G(PF)21/4‐1163G(PF)21/2‐1172G(PF)23/4‐1178.5G(PF)3‐1185G(PF)31/2‐1197G(PF)4‐11─G(PF)41/2‐11─G(PF)5‐11─G(PF)51/2‐11─G(PF)6‐11─美制标准管用螺纹（NPT、NPS）管用螺纹规格平行螺纹(NPS）锥度螺纹（NPT）底孔钻头直径使用铰刀不使用铰刀mminchmminchmminch1/16‐275.940.2346.150.2466.350.251/8‐278.330.3288.430.3328.740.3441/4‐1810

5、.720.42211.130.43811.130.4383/8‐1814.270.56214.270.56214.680.5781/2‐1417.480.68817.860.70318.260.7193/4‐1422.630.89123.010.90623.420.9221‐111/228.581.12528.981.14129.361.15611/4‐111/237.311.46937.691.48438.11.511/2‐111/243.261.70343.661.71944.451.752‐111/255.172.17255.582.1885

6、6.362.21921/2‐865.482.57866.272.60967.462.656