BS ISO 4779 pdf free download
BS ISO 4779-2021 pdf free download.Chain components for lifting purposes – Forged eye hook with point and latch – Grade 4, stainless steel, solution annealed.
This document specifies the requirements for forged eye hooks with point and latch of grade 4 from stainless steel and solution annealed for use preferably as a component in chain slings of welded construction of grade 4 from stainless steel and solution annealed.
IMPORTANT — For other applications, e.g. steel wire rope slings or textile slings, it is important that the hook design is checked to ensure its fitness for a safe use.
NOTE 1 The grade for the hook according to this document is taken from the grade of the sling chain according to ISO 1835. Both (sling chains and hooks) have identical scopes and values for the working load limit, WLL, according to Table 2 and values for the mechanical requirements according to Table 3. Thus, the direct correlation of hooks to the sling chain is given by the WLL and especially the code system on the product body itself. The grade of the hook does not define any values of the tensile strength of the hook material. For further information, see Annex B.
The range of the nominal diameter, d, of the associated sling chain according to ISO 1835 is from 4 mm to 22 mm.
Hooks according to this document are for use in the temperature range —100 °C to +400 °C.
These hooks are solution annealed in the finished condition and can therefore be used without restrictions with regard to the corrosion resistance of the steels according to 5Zi.
NOTE 2 The term “eye hook with point and latch” is taken from ISO 1837:2003, Figure 5.
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 1835, Round steel short link chains for lifting purposes — Medium tolerance sling chains — Grade 4, stainless steel
ISO 1837, Lifting hooks — Nomenclature
ISO 3452-1, Non-destructive testing — Penet rant testing — Part 1: General principles
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 8539, Forged steel lifting components for use with Grade 8 chain
ISO 13385-1, Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1:
Design and metrological characteristics of callipers
ISO 16143-2, Stainless steels for general purposes — Part 2: Corrosion-resistant semi-finished products,
bars, rods and sections
EN 10228-2, Non-destructive testing of steel forgings – Part 2: Penetrant testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1837, ISO 8539 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.elcctropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 nominal size
combination of numerical values without units for designation and ordering purposes, which indicates the nominal diameter of the associated round steel link chain and the grade of the forged component
EXAMPLE 10-4
3.2 test force FT
force applied to the hook during the tensile test
4 Dimensions and designation
4.1 Dimensions
The bases for calculation of the values for the dimension limits listed in Table 1 are given in Annex A. The corresponding dimension letters are shown in Figure 1. The specified values are absolute limits.
The geometry of the hook is not specified in detail. Therefore, Figure 1 specifies only where the dimension values according to Table 1 are measured.BS ISO 4779 pdf download.
