Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series; German and English version EN 4554:2003
国外标准现行
标准号:DIN EN 4554-2004
标准名称: 航空航天系列.耐热钢制37?球面管子接头.加螺纹直活管节.英制系列
英文名称:Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series; German and English version EN 4554:2003