BS EN 2856:2006 PDF

Scope: This standard specifies requirements for closed corner, counterbored, fixed, reduced series anchor nuts, with a self-locking feature achieved by forming the upper portion out-of-round. These nuts are intended for use in aircraft assemblies, in which the fasteners are mainly objected to shear loads. The counterbore is deep enough to accommodate a bolt shank in excess of assembly thickness, as well as the incomplete threads. They are intended to be used with threaded parts of 1 100 MPa 1) tensile strength classification. The cadmium plating restricts the application to temperature not exceeding 235 °C.

BS EN 2856:2006 Referenced Document

EN 2133 Aerospace series - Cadmium plating of steels with specified tensile strength ≤ 1450 MPa, copper, copper alloys and nickel alloys*， 2020-11-30 Update
ISO 3222 Aerospace - Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore, with MJ threads, classifications: 1100 MPa (at ambient temperature)/235 °C, 1100 MPa (at ambient temperature)/315 °C and 1100 MPa (at ambient temperature)/425
ISO 5855-2 Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts
ISO 5858 Aerospace - Nuts, self-locking, with maximum operating temperature less than or equal to 425 °C - Procurement specification
ISO 8788 Aerospace — Nuts, metric — Tolerances of form and position*， 2024-04-18 Update

2006 BS EN 2856:2006 Aerospace series - Nuts, anchor, self-locking, fixed, closed corner, reduced series, with counterbore - Classification: 1100 MPa/235 °C