BRITISH STANDARD BS EN ISO Incorporating Corrigendum No. 1 Fasteners — Quality assurance system The European. Find the most up-to-date version of ISO at Engineering We are looking ISO , it was referenced in a document. The statement that can be found on it is: ISO specifies requirements for a fastener q.
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BS EN ISO 16426:2002
It is identical with ISO A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication 1626. Date Comments Corrigendum No. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member.
A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Mayand conflicting national standards shall be withdrawn at the latest by May Endorsement notice The text of ISO In the kilnuley evtne ttah a borpmel talerign to ti f 14626 saelpfni erom teh tneCS larterceratai ta thserdda es igvne olebw.
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, governmental 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 voting.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent isi.
ISO shall not be held responsible for identifying any or all such patent rights. Annex A of this International Standard kso for information only. These requirements are intended to reduce or prevent the production of non- conforming fasteners with the objective of approaching zero defects for the characteristics specified. This International Standard outlines the requirements from receipt of raw material through the manufacturing process to delivery at the distributor or the user, who is the installer.
For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this 61426 Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
NOTE 2 The manufacturing lot may be split into a number of manufacturing batches for processing purposes and then reassembled into the same manufacturing lot. The order shall designate the selected product characteristics, if any, considering the intended application, or a reasonably foreseeable application and its consequence.
This control plan is part of the quality assurance system to be used by the manufacturer. For all other characteristics, the manufacturer may use the quality plan of his choice and the customer shall rely on ISO to evaluate the level of conformance of the purchased fasteners.
Fasteners manufactured under the conditions of this International Standard shall be delivered in manufacturing lots. The shipping document shall include at least the designation of the fasteners and the manufacturing lot number or trace number. The manufacturer shall be able to provide documentation for any manufacturing lot, to prove the compliance of the fasteners to the specifications, and this shall include at least: The manufacturer shall be able to provide full manufacturing lot documentation for a ten-year period from the date of the sale to the customer, provided the customer gives the manufacturing lot number to the manufacturer.
The distributor shall be able to provide full manufacturing lot documentation for a ten year period from the date of the sale to the customer, provided the customer gives the manufacturing lot number or the trace number to the distributor. The documentation for traceability shall be preserved by the manufacturer for at least ten years from the date of sale to the customer. In case of dispute, the supplier shall be able to provide all necessary information relating to the manufacturing lot number.
The customer, upon opening the original packaging, assumes full responsibility for all subsequent traceability. They shall be analysed by the manufacturer in order to gain knowledge on how to improve the process. Any repackaging carried out by the distributor transfers the responsibilities from the manufacturer to the distributor for those characteristics which may be affected by the repackaging operation.
Additionally, the user shall take all prudent measures to assure the integrity of the fasteners purchased in accordance with this International Standard. If the user considers that the degree to which the characteristic s deviate s from specified requirements will have no significant effect on the assembly or performance of the fasteners in their service application, the user may authorize a written release of the fasteners for completion of production or for shipment, as applicable.
If no parts inspected are found to be non-conforming, the fastener lots may be approved for delivery or use as applicable. The machines used today in the production of fasteners e. The number of parts produced by a manufacturer can amount to up to several million per day, which requires special measures for maintaining the process capability. In addition, the parts are transferred into other vessels many times during the production process, the number of transfer operations depending on the length of the production chain e.
Special measures are taken to prevent mechanical damage especially at points of impact and to avoid contamination. The quality objective, zero defects, cannot be realized with today’s state-of-the-art methods.
To achieve this aim, intermediate objectives are set by specifying criteria for evaluating the delivered quality of fasteners. Some examples are given below to illustrate this. In the manufacture of fasteners, a number of production processes are reached by means of cold forming. The adherence to the tolerances depends not only on the material used but also on a number of other influencing factors; e.
Sharp edges cannot always be avoided with certain cold forming processes. In such cases, it is often not possible to give clearly-defined tolerances or limit values. In the production of threaded fasteners, there are differences in the screw threads based on the method in which the threads are formed which affect geometry, tolerances, roughness, thread laps, etc.
For screws with large length: The corresponding tolerances are specified considering the individual part and production method. When coating the parts for corrosion protection, differences in the local thickness of the coating cannot be avoided and will vary depending on the part size and the coating method, and may cause differences in the local salt spray corrosion resistance.
In such cases, depending on the type and geometry of the fastener, corrosion resistance is based on significant surfaces of the fastener. Adherence to completion of salt spray testing prior to shipment is not always practical because of the testing time required which may exceed several hundred hours.
For this reason, corrosion resistance is assured by means of suitable production management measures utilizing in-process control. A quality judgement of this characteristic by evaluation of ppm is not possible.
The same applies for the application of lubricants on fasteners to meet specified limits of coefficients of friction. The adherence to such a specification e. It is common practice to include only fasteners with non-conforming characteristics and dissimilar fasteners in the establishment of ppm values unless otherwise agreed.
This is schematically illustrated in Figure A. Foreign or mixed parts can result either from the manufacturer’s production chain or the production chain of another party or from other sources. Parts with non-conformities in measurements, geometry and other properties result from unsystematic or systematic process characteristics.
Examples of unsystematic process characteristics are: While unsystematic non-conformities cannot be recognized by statistical process control SPCsystematic non- conformities can usually be limited by the application of SPC. The application of SPC cannot guarantee the delivery of fasteners with non-conformities, on a statistical basis.
BS EN ISO Fasteners — Quality assurance system – MBA智库文档
If, for instance, a value of 1,33 for a single characteristic is assumed, this means that of the fasteners are within the specification for this particular characteristic. If the process is exactly centered, statistically, 0 to 60 fasteners per one million fasteners may then be outside the tolerance limits.
Experience has shown that for one single specified characteristic, after automatic inspection there is still an average remaining 1646 of non-conformities of about.
With an automatic inspection process, usually four or five characteristics are checked simultaneously. So 61426 these fasteners, on average, can be expected.
The requirements for such characteristics are assured by means of a suitable monitoring process, based on a written control plan.
If a characteristic is specified and is considered critical with respect to its intended use, all concerned parties are expected to take prudent measures to approach zero defects. Only ppm values may be established for foreign or mixed parts. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision.
For undated references the latest edition of the publication referred to applies including amendments. It presents the UK view on standards in Europe and at the international level.
It is incorporated by Jso Charter.
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