EN 4498:2005 航空航天系列.十字凹槽,紧公差标准杆,中等长度螺纹,耐热镍基合金,钝化,铝覆层大十二头螺栓.等级-1550Mpa(环境温度)/315摄氏度
Aerospace series - Bolts, large bihexagonal head, close tolerance normal shank, medium length thread, in heat resisting nickel base alloy, passivated, with aluminium pigmented coating - Classification: 1550 MPa (at ambient temperature) / 315 °C