BAC零件号包括字母“BAC”、零件的第一个字母以及数字和字母的组合。不同的零件,其名称的第一个字母相同者,用第一个字母后面的号码区别。所有的弹簧可以是BACS20,所有的螺柱可以是BACS25等等。这个号码后面的字母(在有字母的情况下)表示型式。短横后面的数字通常指零件的尺寸。后缀字母表示特别的生产说明。例如: The BAC part number includes the letters “BAC”, the first letter of the part, and a combination of numbers and letters. Different parts have the same first letter of the name and are distinguished by the number following the first letter. All springs can be BACS20, all studs can be BACS25 and so on. The letter following this number (in the case of a letter) indicates the type. The number behind the dash usually refers to the size of the part. Suffix letters indicate special production instructions. E.g: