This European standard specifies requirements for the nominal dimensions and the tolerences on dimensions, shape and mass of hot-rolled steel equal flange tees with radiused root and toes. These requirements do not apply to equal flange tees produced from stainless steel.
DS/EN 10055:1996 history
1996DS/EN 10055:1996 Hot rolled steel equal flange tees with radiused root and toes - Dimensions and tolerances on shape and dimensions