BS EN 4161-2019 pdf free download.Aerospace series — Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated — Classification: 1 100 PMa (at ambient temperature)/235 °C
This European standard specifies the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated, for aerospace applications.
Classification: 1 100 MPa 1 /235 °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 2133, Aerospace series — Cadmium plating of steels with specified tensile strength ≤ 1 450 MPa,copper, copper alloys and nickel alloys
EN 2137, Aerospace series — Steel FE-PL75 — 1 100 MPa ≤ R m≤ 1 250 MPa — Bars — D e ≤ 100 mm
EN 2424, Aerospace series — Marking of aerospace products
EN 2442, Steel FE-PL711 — 1 100 MPa ≤ R m  1 300 MPa — Bars and wires — D e≤ 25 mm
ISO 3353-1, Aerospace — Lead and runout threads — Part 1: Rolled external threads
ISO 5855-2, Aerospace — MJ threads — Part 2: Limit dimensions for bolts and nuts
ISO 7689, Aerospace — Bolts, with MJ threads, made of alloy steel, strength class 1 100 MPa —Procurement specification
ISO 7913, Aerospace — Bolts and screws, metric — Tolerances of form and position
ISO 14275, Aerospace — Drives, internal, offset cruciform, ribbed — Metric series
ISO 14276, Aerospace — Drives, internal, offset cruciform — Metric series
ASD-STAN/TR 3775, Aerospace series — Bolts and pins — Materials
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 http://www.iso.org/obp
IEC Electropedia: available at http://www.electropedia.org/
4 Required characteristics
4.1 Configuration — Dimensions — Masses
Shall be in accordance with Figure 1 and Table 1.
Dimensions and tolerances are expressed in millimetres and apply after surface treatment.
4.2 Tolerances of form and position
Shall be in accordance with ISO 7913.
4.3 Materials
Shall be in accordance with EN 2137 and EN 2442 or
ASD-STAN/TR 3775 (alloy steel, classification 1 100 MPa).
4.4 Surface treatment
According to EN 2133, 8 μm to 14 μm, on all surfaces which can be contacted by a 20 mm diameter ball.
On all other surfaces, a continuous deposit shall be present, but no value is specified.
Black colour option: code B.
5 Designation
EXAMPLE
NOTE If necessary, the code I9005 may be placed between the description block and the identity block.
6 Marking
See Table 3 and Figure 1.
7 Technical specification
Shall be according to ISO 7689, except for the following clauses:
a) Approval of manufacturers
The manufacturer’s operations shall be an approved production organization for aerospace products and shall demonstrate that it has implemented and is able to maintain a quality system (e. g. according to EN 9100 or an equivalent aerospace accepted and established quality management system).
b) Qualification of screws
The qualification procedure for aerospace standard products (e. g. according to EN 9133 or an equivalent aerospace accepted and established qualification procedure) shall be used and documented according to the specified tests if not otherwise agreed between customer and supplier.BS EN 4161 pdf download.