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Standards Development
This document specifies the limits for surface discontinuities of washers designed to be used in bolted joints in combination with bolts, screws, studs and nuts.
This document basically applies to the following washers manufactured from flat steel and stainless steel raw materials (such as strips), delivered in the uncoated or coated surface condition:
— plain washers (with or without knurls, ribs or chamfers),
— square washers,
— square hole washers,
— shaped plates,
— non-flat washers (e.g. conical, waved, curved, teethed, toothed washers, etc.),
— in steel with thickness 0,2 mm to 12 mm (see e.g. ISO 898-3),
— in stainless steel with thickness 0,2 mm to 6 mm (see e.g. ISO 3506-7).
This document (or part of it) is also applicable to other thickness or types of washers or similar parts (such as ribbed, knurled or serrated washers) by agreement between the purchaser and the supplier.
WARNING For the purpose of this document, surface discontinuities shown in Figures are sometimes exaggerated and/or chosen to make them visible and/or recognizable. Limits related to each discontinuities are defined in the following relevant Clauses.
Relevance of surface discontinuities in relation to the washer types is given in Annex A for guidance.
A multilingual list of terms used for washer surface discontinuities is also given in Annex B.
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