常用螺纹底孔尺寸表.doc

英制螺纹尺寸表英制尺寸公称直径底孔直径英制尺寸公称直径底孔直径SM1/4″×20Φ6。350Φ5。080SM3/32″×56Φ2.381Φ1。928SM1/4″×24Φ6.350Φ5。290SM7/32″×22Φ5.556Φ4.402SM1/4″×28Φ6.350Φ5.443SM7/32″×32Φ5。556Φ4。763SM1/4″×40Φ6。350Φ5.705SM9/32″×20Φ7。144Φ5.873SM1/8″×40Φ3.175Φ2.540SM9/32″×28Φ7.144Φ6.237SM1/8″×44Φ3。175Φ2。598SM11/32″×28Φ8。731Φ7.824SM1/8″×48Φ3.175Φ2.646SM3/64″×32Φ1。191Φ0.397SM3/8″×28Φ9.520Φ8.620SM5/64″×64Φ1。984Φ1.511SM5/8″×28Φ15.87Φ14.957SM9/64″×40Φ3。572Φ2.937SM3/16″×24Φ4.762Φ3.704SM11/64″×32Φ4。366Φ3.572SM3/16″×32Φ4。762Φ3。957SM11/64″×40Φ4。366Φ3.731SM3/16″×28Φ4.762Φ3。855SM13/32″×32Φ5。519Φ4。366SM3/16″×40Φ4.762Φ4。128SM15/64″×28Φ5.953Φ5。046SM5/16″×18Φ7.938Φ6.526SM17/64″×32Φ6.747Φ5。953SM5/16″×24Φ7。938Φ6.879SM1/2″×28Φ12.70Φ11。792SM5/16″×28Φ7.938Φ7。030SM1/2″×14Φ20.50Φ18.70英制内螺纹小径计算公式：螺纹直径×25.4-25.4/每英尺牙数例：11/64″×40=11/64×25。4-25。4/40=4.3656-0。635≈3。73公制螺纹尺寸表公制螺纹M1M2M2.5M3M3.5M4M4.5M5M6M7M8M10M12M14M16粗牙螺距0.250.40。450。50.60.70。750.8111.31。51。7522钻头直径Φ0.75Φ1.6Φ2.05Φ2。5Φ2.9Φ3.3Φ3.75Φ4.2Φ5Φ6Φ6.7Φ8。5Φ10。2Φ11.9Φ13.9细牙螺距0。20。30.40。50.50.810.7511。250。751。51。2511.51。2511。51钻头直径0.81.82。73.54。55.277.298。79.210。510。71112.512。71314。51.5公、英制转换英寸值1/64″1/56″1/48″1/44″1/40″1/32″1/28″公制值0。3970。4540。5290。5770。6350。7940.907英寸值1/24″1/20″1/18″1/16″1/8″1/4″1/2″公制值1.0581。271.4111.5883。1756。3512。7