EN 3431:2007
航空航天系列.镀银,耐热钢制带沉孔和附属垫圈的自锁紧六角螺母.等级-1100MPa(环境温度)/425℃
Aerospace series - Nuts, hexagonal, self-locking, with counterbore and captive washer, in heat resisting steel, silver plated - Classification: 1 100 MPa (at ambient temperature) / 425 °C