EN 4073:2009 航空航天系列.镀镉合金钢中等长度螺纹粗公差标称柄六瓣凹槽平头螺钉.等级-1100MPa(环境温度)/235℃
Aerospace series - Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification 1 100 MPa (at ambient temperature) / 235 degree C