DS/EN 2809:2001
航空航天系列 螺母,六角形,开槽/城堡形,高度减少,平面对边,耐热钢,镀银 等级 900 MPa(在环境温度下)/650°C
Aerospace series - Nuts, hexagon, slotted/castellated, reduced height, normal across flats, in heat resisting steel, silver plated - Classification 900 MPa (at ambient temperature)/650°C