BS EN 4084-2009 pdf download.Aerospace series — Nuts, anchor, self- locking, fixed, two lug, with counterbore, in alloy steel, cadmium plated, MoS2 lubricated — Classification: 1 100 MPA (at ambient temperature) / 235 °C.
This BS EN 4084 specifies the characteristics of two lug fixed anchor nuts, with counterbore and a self- locking feature achieved by forming the upper portion out-of-round, in alloy steel, cadmium plated, MoS2 lubricated.
Classification: 1100 MPa )/235 °C 2)
2 Normative references
EN 2133, Aerospace series — Cadmium plating of steels with specified tensile strength ≤ 1450 MPa. copper, copper alloys and nickel alloys
EN 2424:2008, Aerospace series — Marking of aerospace products
EN 2491, Aerospace series — Molybdenum disuiphide di’, lubricants — Coating methods
EN 2542, Aerospace series — Steel FE-PL 1502 (25CrMo4) — Annealed — Bar and wire — De ≤ 40 mm — For prevailing torque nuts
EN 2543, Aerospace series — Steel FE-PL 1502 (25CrMo4) — Annealed — Sheet and strip — 0,3mm S a S 2 mm — For prevailing torque nuts
EN 9100, Quality Management Systems — Requirements for Aviation, Space and Defense Organizations
EN 9133. Aerospace series — Quality management systems — Qualification procedure for aerospace standard parts
ISO 3223, Aerospace — Nuts, anchor. self-locking, fixed, two lug, with counterbore, with MJ threads, classifications: 1100 MPa (at ambient temperature)1235 °C, 1 100 MPa (at ambient temperature)/315 °C and 1100 MPa (at ambient temperature)/425 °C — Dimensions
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
TR 3791, Aerospace series — Materials for self-locking nuts, threaded inserts and screw thread inserts of temperature classes 5 425 °C 3).
3 Required characteristics
3.1 Configuration — Dimensions — Masses
See Figure 1 and Table 1
Dimensions and tolerances are in conformity with ISO 3223. expressed in millimetres and apply after cadmium plating but before MoS2 lubrication.
Form and position tolerances shall be in conformity with ISO 8788 and those specified in Table 1.
3.2 Materials
EN 2542, EN 2543 or TR 3791
3.3 Surface treatment
EN 2133. 5 pm minimum on threads and all surfaces which can be contacted by a 20 mm diameter ball. On all other surfaces a continuous deposit shall be present. plus EN 2491, thickness not specified.
5 Marking
EN 2424:2008. style N. See Figure 1.
6 Technical specification
ISO 5858 except for:
— Approval of manufactures: see EN 9100;
– Qualificat,on of products: see EN 9133.BS EN 4084-2009 pdf download.