JIS G4320-2003
JIS G 4320-2003 is a Japanese Industrial Standard that specifies the dimensions and tolerances for seamless steel pipes. This standard covers carbon steel pipes, used in various industrial applications such as pipelines, construction, and machinery. The pipe size in JIS G 4320-2003 is designated by the outer diameter (OD) and the wall thickness (WT), with the letter “S” indicating seamless …