DS EN 3750:2010 Aerospace Series - Nuts, Anchor, Self-Locking, Fixed, 90 Degrees Corner, Reduced Series, With Counterbore, In Heat Resisting Steel, Mos[2] Lubricated - Classification: 1100 Mpa (At Ambient Temperature)/315 Degrees C Defines the characteristics of 90 degrees corner, reduced series, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in heat resisting stee