ISO 5251 Stainless steel butt-welding fittings,
Specifies the 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.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.
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ISO_5251-1981-Stainless-steel-butt-welding-fittings.pdf
Research use only,Commercial use is prohibited.
If you want to use it ,you can buy from following link:
http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=11250