螺纹基本尺寸对照表 2文档格式.docx

1、R圆锥外螺纹（螺纹牙型角55度，斜角为1七、普通螺纹（螺纹牙型角60度）M普通螺纹代号八、特殊螺纹Tr梯形螺纹（螺纹牙型角30度）B锯齿形螺纹（牙型角3030度）螺纹公称直径d螺距P钻头直径d铜不锈钢20416025175305250352154073335508414245614907552812566677717210158485868769121011021041051061071091114118124125129131613814414514915181531551581641651691720173175178184185189192219319519820420520921242

2、0721822422522923非螺纹密封英制英制锥管螺纹英制锥螺纹螺纹直径牙数钻头直径1/82888271/41171121113/81521471/21831793/42442362323062971152921-1/43923833791-3/84161-1/244143945155856螺距（t）螺纹长度基面上螺纹直径牙型高度（h1）有效长度基面长度外径（d）中径（d2）内径（d1）0.9194.59.739.158.570.581.3413.1612.311.450.8616.6615.8114.951.817.520.9619.7918.631.169.526.4425.2824.

3、122.3133.2531.7730.291.4841.9140.4338.9547.8146.3344.852659.6258.1456.663018.575.1973.7172.233220.587.8986.4184.933825.5113.03111.56110.08本螺纹基面上各直径等于圆柱螺纹的各相应直径基面上螺纹内径 d1 = d - 1.28t3/4 = 26.44 - 1.28 * 1.81 = 24.12斜角（）124 锥角 （2tg）=1:公称直径（英寸）每英寸牙数（n）管子外径（d）管接头螺纹内径（d1）名义尺寸最大外径最小外径最大内径最小内径 1/89.689.388

4、.928.67 1/413.112.7411.8411.56 3/816.616.2415.3515.06 1/220.8919.0518.75 5/822.9122.8522.4620.5921.0120.71 3/426.3825.9724.5724.257/830.230.1429.7327.8828.3328.0133.1832.7530.7930.4341.8441.3639.4639.144.3344.2643.7841.3741.8741.5147.7447.2145.4451-3/453.7553.6753.1450.7951.3450.9459.5459.0157.2156.

5、812-1/275.1174.5472.8372.393 87.887.1985.5885.1外径d由公称直径所决定螺纹内径 d1 = d - 1.28t1/160.946.54.067.97.146.390.754.5710.279.528.771.415.0813.5712.4411.311.1310.56.117.0615.9314.813.58.1321.2219.7718.321.458.6126.5725.1223.6711-1/22.2117.510.1633.2331.4629.691.7710.6741.9940.2238.4548.0546.2944.5211.0760.0958.3356.56牙型高度 h1=0.8t基面上螺纹内径 d1 = d - 1.6t3/8 = 17.06mm d1=17.06 - 1.6 * 1.41 = 14.80公称直径每寸牙数外螺纹外径内螺纹内径选用钻头最大尺寸最小尺寸3/161.064.634.243.563.973.713.71/41.276.26.055.754.915.395.15.15/167.787.627.316.346.866.556.53/81.599.369.28.97.738.297.977.97/16