7531-87 4851903 0056090 丁-01~19 ISO INTERNATIONAL STANDARD 7531 First edition 1987-12-15 INTERNATIONALORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ME>KAYHAPOAHAAOPrAHM3ALMANOCTAHAAPTW3AMM Wire rope slings for general purposes - Characteristics and specifications Elingues de cables en acier pour usages courants - Caracteristiques et specifications Referencenumber ISO 7531:1987(E) 7531-87 4851903 0056091 Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through ISo technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. InternationalStandardISO7531waspreparedbyTechnical CommitteeISO/TC105 Steelwire ropes. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. @InternationalOrganizationforStandardization1987 Printed in Switzerland Coovriaht Intemational Oroanization for Standardization 7531-87 EObTSh 80056092 INTERNATIONALSTANDARD ISO7531 : 1987 (E) Wire rope slings for general purposes Characteristics and specifications 1 Scope and field of application 3Definition This International Standard specifies a series of wire rope slings working load limit (WLL) : The maximum load which the for general purposes. It covers the type of sling, the working sling is rated to raise, lower or suspend in straight pull. load limit, and the manufacture of slings and sling assemblies. The multilegged slings covered by this International Standard In the case of a single-leg sling, this load is applied vertically. In are constructed with legs of equal nominal length. the case of a multilegged sling, this load is applied at a maximum included angle of 90° or 120° (see clause 5). NOTE -- Slings of unequal leg length may also be constructed gener- ally in accordance with this International Standard, but the rating of such slings requires special consideration by a competent person. 4 Single-leg slings 2 References 4.1 Types of sling Iso2408,Steel wire ropes for general purposes Single-leg slings shall be of one of the types shown in figure 1, Characteristics. with or without additional terminal fittings such as links or hooks. If a terminal fitting is used, the eye shall always be fitted Iso 8793, Steel wire ropes - Ferrule-secured eye termina- with a thimble. tions. Iso 8794, Steel wire ropes - Spliced eye terminations for slings. YM Type SS : spliced Type FS : ferrule secured Type ST : spliced Type FT : ferrule secured with soft eyes with soft eyes with thimbles with thimbles Figure 1 -- Types of slings riaht Intemational Oroanization for Standardization