BS 2923:2019 pdf download – Aerospace series – Nuts, hexagon, plain, reduced height, reduced across flats, in heat resisting steel, silver plated – Classification: 600 MPa (at ambient temperature) / 425 °C
This European standard specifies the characteristics of hexagon plain nuts, reduced height, reduced across flats, in heat resisting steel, silver plated, for aerospace applications.
Classification: 600 MPa 1) /425 °C 2) .
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 2424, Aerospace series — Marking of aerospace products
EN 2786, Aerospace series — Electrolytic silver plating of fasteners
EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defence Organizations
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
ISO 8788, Aerospace — Nuts, metric — Tolerances of form and position
ISO 9139, Aerospace — Nuts, plain or slotted (castellated) — Procurement specification
TR 3823-002, Aerospace series — Materials for plain, slotted and self-locking by plastic ring hexagonal nuts 3)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at
— IEC Electropedia: available at
4 Required characteristics
4.1 Configuration — Dimensions — Masses
See Figure 1 and Table 1.
Dimensions and tolerances are expressed in millimetres and apply after surface treatment.
Details of form not stated are at the manufacturer’s option.
4.2 Tolerances of form and position
ISO 8788.
4.3 Materials
TR 3823-002.
4.4 Surface treatment
EN 2786, thickness:
— on external surfaces : 5 μm to 15 μm;
— on pitch diameter : 5 μm minimum.
6 Marking
EN 2424, style C, plus MJ.
7 Technical specification
Shall be according to ISO 9139, except for approval of manufacturers: see EN 9100.BS 2923 pdf download.