DS EN 2881:2006 Aerospace Series - Nuts, Anchor, Self-Locking, Fuel Resistant, Sealing, Floating, Two Lug, With Counterbore, In Corrosion Resisting Steel, Passivated, Mos[2] Lubricated - Classification: 900 Mpa (At Ambient Temperature)/120 Degrees C Defines the characteristics of self-locking, fuel resistant, sealing, floating, two lug anchor nuts, with counterbore, in corrosion resisting steel, passivated, MoS[2] lubricated.