BS EN ISO 7053:2019 pdf free.Fasteners- Hexagon washer head tapping screws (ISO 7053:2019).
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.
ISO 1478, Tapping screws thread ISO 2702, Heat-treated steel tapping screws — Mechanical properties ISO 3269, Fasteners — Acceptance inspection
ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners — Part 4: Tapping screws ISO 4042, Fasteners — Electroplated coating systems ISO 4759-1, Tolerances forfasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C ISO 8992, Fasteners — General requirements for bolts, screws, studs and nuts ISO 10683, Fasteners — Non-electrolytically applied zinc flake coating systems
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 https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Dimensions
Dimensions shall be in accordance with Figures 1 and 2 and Table 1. Symbols and descriptions of dimensions are defined in ISO 225. Thread sizes shown in brackets are non-preferred diameters. NOTE Preferred lengths are those between the discontinuous, bold, stepped lines. a Pis the pitch of the thread.
5 Requirements and reference International Standards
The requirements specified in the International Standards listed in Table 2 shall apply. Additional requirements or other finishes or coatings shall be agreed between the supplier and the purchaser. Acceptance inspection as specified in ISO 3269.
6 Designation
EXAMPLE 1 A hexagon washer head tapping screw with thread size ST3,9, nominal length I= 16 mm, made of steel (St) in accordance with ISO 2702 and rounded end [Type R) is designated as follows: Hexagon tapping screw ISO 7053- ST3,9x 16-St-R
EXAMPLE 2  A hexagon washer head tapping screw with thread size ST3,9, nominal lengthI= 16 mm, made of stainless steel of grade A4 and with hardness class 20H [A4-20H) in accordance with ISO 3506-4 and cone end (Type C) is designated as follows:Hexagon tapping screw ISO 7053 – ST3,9x 16- A4-20H- C.BS EN ISO 7053 pdf download.