一種均質球體,由一系列球體構成,構成軸承中的滾動元件,即球(經過改良)。此部件主要用於減輕摩擦。它也可能用於其他用途,例如球式止回閥中的止回部件。不含:止回球;附孔球閥。
valve, pressure end item identification, zzzw criticality code justification, aisi assn std all material responses overall material document and classification, steel comp 440a or steel comp 440b or steel comp 440c overall material, cleaning, packaging, and marking iaw mil-std-1330d departure from cited document