BS EN 2874:1996
钝化处理的耐热镍基合金中长度螺纹紧公差标准螺杆的大双六角头螺栓.等级:1550MPa(室温)/315℃
Bolts, large bihexagonal head, close tolerance normal shank, medium length thread, in heat resisting nickel base alloy, passivated - Classification: 1550 MPa (at ambient temperature) /315 °C