This standard BS EN 4011:2004 Aerospace series. Nuts, bihexagonal, self-locking, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated. Classification: 1550 MPa (at ambient temperature)/600°C is classified in these ICS categories:
49.030.30 Nuts
This standard specifies the characteristics of self-locking bihexagonal nuts in NI-P100HT, silver plated, for aerospace applications. Classification : 1 550 MPa/600 °C