DS EN 3753:2010 Aerospace Series - Nuts, Anchor, Self-Locking, Fixed, 60 Degrees Corner, With Counterbore, In Alloy Steel, Cadmium Plated, Mos[2] Lubricated - Classification: 1100 Mpa (At Ambient Temperature)/235 Degrees C Defines the characteristics of 60 degrees corner, counterbored fixed anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round, in alloy steel, cadmium plated, MoS[2]