BS EN 4073:2009
航空航天系列.镀铬的合金钢中等长度螺纹、粗公差标准柄六瓣凹槽平头螺钉.等级1100MPa(室温)/235℃
Aerospace series - Screws, pan head, six lobe recess, coarse tolerance normal shank, medium length thread, in alloy steel, cadmium plated - Classification 1100 MPa (at ambient temperature) / 235 °C