6 Easy Facts About GA Drawing Service & Rebar Estimation - IndiaMART Shown s.) KS Symbol of Deformed Rebar: show as SD300, SD350, SD400, SD500 In SD400, S is steel, D is Deformed Bar, 40 suggests that resistance point is over 40kgf/mm2(= 400N/mm2= 4,000 kgf/cm2). 9.