ISO 3419 Non-alloy and alloy steel butt-welding fittings.
This second edition cancels and replaces the first edition (1975). Specifies the dimensions, tolerances and generally used grades of non-alloy, low alloy and alloy steels for bends /type 2D (90 and 180 ) and 3D (45 , 90 and 180 )/, concentric and eccentric reducers, tees, caps and ends with quality requirements as used for piping work.This second edition cancels and replaces the first edition (1975). Specifies the dimensions, tolerances and generally used grades of non-alloy, low alloy and alloy steels for bends /type 2D (90 and 180 ) and 3D (45 , 90 and 180 )/, concentric and eccentric reducers, tees, caps and ends with quality requirements as used for piping work.
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ISO_3419-1981-Non-alloy-and-alloy-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=8736