螺旋线helix螺纹screwthread圆柱螺纹parallelscrewthread圆锥螺纹taperscrewthread外螺纹externalthread内螺纹internalthread单线螺纹single-startthread多线螺纹multi-startthread右旋螺纹right-handthread左旋螺纹left-handthread自攻螺纹tappingscrewthread基本牙型basicprofile牙型角threadangle牙型半角halfofthreadangle公称直径nominaldiameter螺纹大径majordiameter螺纹小径minordiameter螺纹中径pitchdiameter螺距pitch螺纹导程lead螺纹升角leadangle螺纹牙厚threadridgethickness螺纹槽宽threadgroovewidth螺纹旋合长度lengthofthreadengagement螺纹接触高度threadcontactheight螺距偏差deviationinpitch螺距累积误差cumulativeerrorinpitch螺栓bolt双头螺柱stud六角头螺栓hexagonbolt地脚螺栓foundationboltT形螺栓T-headbolt,hammerheadbolt螺钉screw紧定螺钉setscrew自攻螺钉tappingscrew吊环螺钉liftingeyebolt开槽圆柱头螺钉slottedcheeseheadscrew开槽盘头螺钉slottedpanheadscrew开槽沉头螺钉slottedcountersunk(flat)headscrew开槽半沉头螺钉slottedraisedcountersunk(oval)headscrew开槽圆头螺钉slottedroundheadscrew内六角圆柱