BS EN 3323:2009(2015)
航空航天系列 — 双六角头螺栓,带浮肩长螺纹, — 耐热钢 FE - PM 38 (FV 535) — 分类:1000 MPa / 550 °C
Aerospace series — Bolts with double hexagon head, relieved shank long thread, — In heat resisting steel FE - PM 38 (FV 535) — Classification : 1000 MPa / 550 °C