BS ISO 5743:2021 pdf download – Pliers and nippers — General technical requirements

BS ISO 5743:2021 pdf download – Pliers and nippers — General technical requirements This document specifies the general technical requirements to be met by pliers and nippers. It does not specify insulating or antistatic characteristics of handle coatings. Plastic coatings or plastic sleeves are intended for gripping comfort only. This document is only applicable to pliers for which ISO standards exist. 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 5742, Pliers and nippers — Nomenclature ISO 5744, Pliers and nippers — Methods of test 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminology databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at https://www.electropedia.org/ 4 Handles Handles of pliers shall be shaped to afford a comfortable grip and shall prevent accidental bruising or clamping. To prevent bruising of skin, clear-cut edges should be avoided, e.g. by designing the edges of the gripping zone with a radius, bevel or chamfer > 2 mm (see Figure 1) or similar solutions with a distance between the handles smaller than 10 mm. Evaluation shall be carried out while the handles are squeezed by a hand force F of 50 N to be applied 32 mm inwards from the outer end of the pliers’ handles (Figure 2). For multiple slip-joint pliers every position shall be tested. The hand force F of 50 N shall be applied 32 mm inwards from the outer end of the shorter length handle (Figure 3). For pliers provided with a comfort grip, the width of the handles shall include the thickness of the comfort grip. 5 Heads 5.1 Joint The joint shall be constructed to allow free movement from the closed to the open position and shall be free from excessive side movement in any position that can impair the function of the tool. 5.2 Jaws For all pliers the jaws shall meet at the point. Pliers and nippers for which other specifications are laid down in the dimensional standards are excluded. Cutting edge of cutting pliers shall have a minimum hardness of 55 HRC. The...