常用螺纹底孔尺寸表-螺纹孔尺寸标准.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SM1/4206。3505。080SM3/32562.3811.928SM1/4246。3505.290SM7/32225.5564.402SM1/4286。3505.443SM7/32325.5564。763SM1/4406。3505。705SM9/32207。1445。873SM1/8403。1752.540SM9/32287.1446。237SM1/8443。1752.598SM11/32288。7317.824SM1/8483.1752。646SM3/64321。1910.397SM3/8289。5208。620SM5/64641.9841。511SM5/82815。8714。957SM9/64403。5722.937SM3/16244.7623.704SM11/64324.3663。572SM3/16324。7623.957SM11/64404。3663。731SM3/16284。7623.855SM13/32325。5194.366SM3/16404。7624.128SM15/64285。9535。046SM5/16187。9386。526SM17/64326。7475。953SM5/16247.9386.879SM1/22812。7011.792SM5/16287.9387。030SM1/21420。5018.70英制内螺纹小径计算公式:螺纹直径25。425.4/每英尺牙数例：11/6440=11/6425。4-25。4/40=4。36560.6353。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0.751。62.052。52。93.33.754.2566。78。510.211。913。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1/641/561/481/441/401/321/28公制值0。3970.4540.5290。5770。6350。7940。907英寸值1/241/201/181/161/81/41/2公制值1。0581。271.4111。5883。1756。3512.7