BS/EN 2878-2018 pdf download.Aerospace series – Nuts, anchor, self-locking, air resistant, sealing, floating, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated – Classification: 900 MPa (at ambient temperature)/235 °C.
This BS/EN 2878 specifies the characteristics of self-locking, air resistant, sealing, floating, two
lug anchor nuts, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated.
Classification: 900 MPa ‘)/235 °c2)
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 2133, Aerospace series — Cadmium plating of steels, with maximum specified tensile strength equal to or less than 1 450 MPa, copper, copper alloys and nickel alloys3)
EN 2424, Aerospace series — Marking of aerospace products
EN 2491, Aerospace series — Molybdenum disuiphide thy lubricants — Coating methods
EN 9100, Quality Management Systems — Requirements forAviation, Space and Defence Organizations
EN 9133, Aerospace series — Quality Management Systems — Qualification Procedure for Aerospace Standard Products
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 ofform and position
ISO 8940, Aerospace — Nuts, anchor, self-locking, sealing, floating, two lug, with counterbore, with Mj threads, classifications 900 MPa (at ambient tern perature,1/120 °C 900 MPa (at ambient teinperaturej/1 75 °C and 900 MPa (at ambient tern perature/235 °C — Dimensions
AMS 3304G, Silicone Rubber, General Purpose, 70 Durometer4)
TR 3791, Aerospace series — Materials for self-locking nuts, threaded inserts and screw thread inserts of temperature classes ≤425 ℃)
3 Required characteristics
3.1 Configuration — Dimensions — Masses
See Figure 1 and Table 1.
Dimensions and tolerances are: in conformity with ISO 8940, expressed in millimetres and apply after
cadmium plating but before MoS2 lubrication.
Details of form not stated are at the manufacturers option.
3.2 Tolerances of form and position
ISO 8788.
3.3 Materials
Cage, seal retainer and nut element: TR 3791.
Sealing ring: rubber, air resistant per AMS 3304 or equivalent.
3.4 Surface treatments
Cage and seal retainer: EN 2133, 5 pm mm. on all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present.
Nut element:
— EN 2133, 5 pm mm, on all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces, a continuous deposit shall be present;
— EN 2491, thickness not specifIed, mandatory on threads, optional on other surfaces.
5 Marking
EN 2424, style N. See Figure 1.
6 Technical specification
Iso 5858. except for:
— approval of manufacturers: see EN 9100;
— qualification of products: see EN 9133.BS/EN 2878-2018 pdf download.