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ISO 5251:1981 Stainless steel butt-welding fittings
standard by International Organization for Standardization, 04/01/1981
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Specifies rhe dimensions, tolerances and generally used grades of stainless steel for bends /type 3D (90 and 180 ) with and without straight ends and type 5D (90 )/, concentric and eccentric reducers, tees, caps and stub ends with quality requirements as used for piping work.