DIN 65542-1987
航空航天.公称抗拉强度1250MPa使用温度为315℃/425℃以下的镍合金制短螺纹长度MJ螺纹的带有筋状翼形的扭矩调节十字槽头埋头紧公差螺钉
Aerospace; countersunk head screws, close tolerance, with ribbed TORQ-SET (ACR) recess and MJ thread, short thread length, nickel alloy, nominal tensile strength 1250 MPa, for temperatures up to 315 °C/425 °C