DIN EN 2874-1996 航空航天系列.钝化耐高温镍基合金中长螺纹十二角紧配合螺丝.等级 1550MPa(室温)/315℃
Aerospace series - 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; German version EN 2874:1996