常用ＺＧ５５°（ＲＣ）圆锥管螺纹 公称通径每寸牙数外螺纹顶圆内螺纹口径有效牙长加工牙长1/4″ 3/81/23/411-1/41-1/222-1/2345681015202532405065801001251501919141411111111111111111112.716.120.325.732.44146.958.574.786.5111.3135.6161.511.214.518.824.230.4394556.872.485.1110.3135.61619.710.113.214.516.819.119.123.426.729.835.840.140.114151819242526263640435055860°圆锥管螺纹与55°圆锥管螺纹的区别： 1. 螺纹本身具有密封性。 2. 圆锥角：1：16 相同点3. 通过控制基面距离（基准长度）来控制直径尺寸。4. 允许在螺纹副内加入密封物。项目标记牙型角不同点牙距公差要求用途60°圆锥管螺纹NPT 3/860°高汽车、飞机、机床中管路连接55°圆锥管螺纹Rc 3/8、Rp 3/8、R3/855°低水、煤气等低压管路系统常用螺纹尺寸表Ｋ６０°（ＮＰＴ）圆锥管螺纹公称通径NPS每寸牙数外螺纹顶/外内螺纹口径/顶圆内基圆有效牙长加工牙长Ｇ（５５°）圆公称通径每寸牙数1/4″ 3/81/23/411-1/41-1/222-1/2345681818141411.511.511.511.588888813.2-0.216.6-0.220.7-0.226-0.332.6-0.341.3-0.347.4-0.359.4-0.371.6-0.487.4-0.4112.6-0.5139.4-0.5166.2-0.5216-0.511.4+0.214.8+0.218.5+0.223.7+0.229.7+0.238.5+0.344.5+0.356.6+0.367.6+0.383.5+0.4108.9+0.4135.9+0.4162.7+0.410.210.413.613.717.41818.419.228.930.53335.738.460141518192326263033374350551/43/81/23/411-1/41-1/222-1/2345619191414111111111111111111°）圆柱管螺纹外径内径13.1516.6620.9526.4433.2541.9147.859.675.1887.88113.1138.4163.811.4514.9518.6324.3230.2938.9544.856.6672.2284.92110135.4160.8
