BS EN 2869:2009
航空航天系列.钝化耐热钢常规双边宽度标称高度开槽/槽顶六角螺母.等级:1100MPa(室温)/650℃
Aerospace series - Nuts, hexagonal, slotted/castellated, normal height, normal accross flats, in heat resisting steel, passivated - Classification: 1100 MPa (at ambient temperature) / 650 °C