DIN EN 4069-1996 航空航天系列.钝化耐高温钢制小板手开口度平面六角螺母.等级:600MPa(室温)/650℃
Aerospace series - Nuts, hexagon, plain, reduced height, reduced across flats, in heat resisting steel, passivated - Classification: 600 MPa (at ambient temperature)/650 °C; German version EN 4069:1996