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1、百度文库-让每个人平等地提升自我4NP俣制螺纹标准与技术数据螺纹规格螺距外径C1底径螺纹标号螺牙角度NPT1/41.41113.6161860NPT3/81.41117.0551860NPT1/21.81421.2231460NPT5/81.81426.5681460NPT12.20833.22711 1/260NPT1 1/42.20841.98411 1/260NPT1 1/22.20848.05311 1/260NPT22.20860.09111 1/260NPT2 1/23.17572.699860NPT33.17588.608860NPT3 1/23.175100.013860备注P
2、T:美国标准的60度锥管螺纹美制一般密封管螺纹的基本尺寸:螺距P牙型基准平面内的基本直径外螺纹小端面内的基本小径尺寸代号牙数n高度h大径d=D中径d1 =D 2小径d1=D 1基准距离L1装配余量L3mm圈数mm圈数mmmm1/16270.9410.7527.8947.1426.3894.324.06432.8226.1371/8270.9410.75210.2429.4898.7374.364.10232.8228.4811/4181.4111.12913.61612.48711.3584.105.78534.23310.9963/8181.4111.12917.05515.92614.79
3、74.326.09634.23314.4171/2141.8141.45121.22419.77218.3214.488.12835.44317.8133/4141.8141.45126.56925.11723.6664.758.61835.44323.127111.52.2091.76733.22831.46129.6944.6010.16036.62629.06011/411.52.2091.76741.98540.21838.4514.8310.66836.35037.7881 1/211.52.2091.76748.05446.28744.5204.8310.66836.35043.8
4、53211.52.2091.76760.09258.32556.5585.0111.06536.35055.86721/283.1752.54072.69970.15967.6195.4617.33526.35066.535383.1752.54088.60886.06883.5286.1319.46326.35062.31131/283.1752.540101.31698.77696.2366.5720.86026.35094.932483.1752.540113.973111.433108.8936.7521.43126.350107.554583.1752.540140.952138.4
5、12135.8727.5023.81226.350134.384683.1752.540167.792165.252162.7127.6624.32026.350161.191883.1752.540218.441215.901213.3618.5026.98826.350211.6731083.1752.540272.312269.772267.2329.6830.73426.350265.3111283.1752.540323.032320.492317.95210.8834.54426.350315.79314O.D.83.1752.540354.904352.364349.82412.
6、5039.68826.350347.34516O.D.83.1752.540405.784403.244400.70414.5046.03826.350397.82818O.D.83.1752.540456.565454.025451.48516.0050.80026.350448.31020O.D.83.1752.540507.246504.706502.16617.0053.97526.350498.79224O.D.83.1752.540608.608606.068603.52819.0060.32526.350599.758注：可参考表中的最右边一列数据选择攻丝前的麻花钻直径； 螺纹收尾长度(V)为3.47 P ; O.D.是英文管子外径(outside diameter )的缩写。标记：美制一般密封管螺纹的完整标记由螺纹特征代号，螺纹尺寸代号和旋向代号组成。左旋螺纹的旋向代号为LH;右旋螺纹的旋向代号省略不标。例如：1/8 NPT-LH,1/8表示螺纹尺寸，NPT为螺纹特征代号，LH表示左旋。美制管螺纹的米制化方法：将管螺纹的原英寸尺寸乘以25.4就转化为毫米尺寸。