公称通径Nominal Diameter螺纹长度Length of Thread方头螺纹堵头Square Head Plug圆头螺纹堵头Round Head Plug六角堵头Hex Head Plug and Bushing方头高度Height of Square平面宽度Width Of Flats圆头直径Diameter of Round Head全长Length平面宽度Width Of Flats六角头高度Hex Head HeightDNNPSL2minBminCminDLminSKminHmin6