NS-EN 2923:2019
航空航天系列 螺母 六角形 普通 高度减小 对边减小 耐热钢材质 镀银 分类:600 MPa(环境温度下)/425 °C
Aerospace series — Nuts, hexagon, plain, reduced height, reduced across flats, in heat resisting steel, silver plated — Classification: 600 MPa (at ambient temperature) / 425 °C