常用新标准管法兰连接尺寸(PN0. 25MPa~PN4. 0Mpa)(GB9112~9131-88PN0. 25~4. 0MPa; JB/T74~90-94第一系列; HGJ44~76-91) 单位: mm公称通径PN0.25MPa(2.5bar)DN法兰外径D螺栓孔中心圆直径K50螺栓孔直径L 螺栓螺纹Th数量n法兰外径D75螺栓孔中心圆直径K50螺栓孔直径L11螺栓螺纹Th数量n法兰外径D90螺栓孔中心圆直径K60螺栓孔直径L14螺栓螺纹Th数量n107511M104M104M12415805511M104805511M104956514M12420906511M104906511M1041057514M124251007511M1041007511M1041158514M124321209014M1241209014M12414010018M1644013010014M12413010014M12415011018M1645014011014M12414011014M12416512518M1646516013014M12416013014M12418514518M1648019015018M16419015018M16420016018M16810021017018M16421017018M16422018018M16812524020018M16824020018M16825021018M16815026522518M16826522518M16828524022M16820032028018M16832028018M16834029522M16825037533518M161237533518M161239535022M161230044039522M201244022M201244540022M2012