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1、牙底root螺纹线helix螺纹screwthread圆柱螺纹parallelscrewthread圆锥螺纹taperscrewthread外螺纹externalthread内螺纹internalthread螺纹副screwthreadpair单线螺纹single-startthread多线螺纹multi-startthread右旋螺纹right-handthread左旋螺纹left-handthread完整螺纹completethread不完整螺纹incompletethread螺尾washoutthread;vanishthread有效螺纹usefulthread螺纹牙形formofthr
2、ead原始三角形fundamentaltriangle原始三角形高度fundamentaltriangleheight基本牙形basicprofile削平高度depthoftruncation设计牙型designprofile最大实体牙型maximummaterialprofile最小实体牙型minimummaterialprofile牙顶crest牙侧flank承载牙侧loadflank非承载牙侧clearanceflank引导牙侧leadingflank跟随牙侧followingflank牙顶高addendum牙底高dedendum牙型高度threadheight牙型角threadangl
3、e牙型半角halfofthreadangle牙侧角flankangle牙顶圆弧半径radiusofroundedcrest牙底圆弧半径radiusofroundedroof公称直径nominaldiameter大径majordiameter小径minordiameter顶径crestdiameter底径rootdiameter中径pitchdiameter单一中径simplepitchdiameter作用中径virtualpitchdiameter基准直径gaugediameter螺纹轴线axisofthread中径线pitchline基准平面的轴向位移偏差deviationofdatumax
4、ialdrift行程偏差deviationofstroke螺距pitch导程lead螺纹升角（导程角）leadangle螺纹牙厚threadridgethickness螺纹槽宽threadgroovewidth螺纹接触高度depthofthreadengagement大径间隙majorclearance小径间隙minorclearance螺纹旋合长度lengthofthreadengagement基准平面gaugeplane基准距离gaugelength装配余量fittingallowance旋紧余量wrenchingallowance行程stroke螺纹精度tolerancequality螺距偏差deviationinpitch螺距累积误差cumulativeerrorinpitch导程偏差deviationinlead导程累积误差cumulativeerrorinlead螺旋线轴向误差helixerrorintheaxis牙侧角偏差deviationofflankangle螺距误差中径当量pitchdiameterequivalentoferrorinpitch牙侧角误差中径当量pitchdiameterequivalentoferrorinflankangle基准距离偏差deviationofgaugelength
螺纹英语术语
