Trademark Nb1,Nb2, FNb1,FNb2 Standard ASTM B392-2003 Size Dia3*1000mm The allowable deviation of bar Diameter/SideThe allowable deviation of diameter or length LengthScale length allowable deviationForged barCrowded barRolled barFortson/Vehicle3.0~3.5±0.05---±0.05---500~1500+5>3.5~4.5±0.07---±0.07---500~1500+5>4.5~10.0±0.10---±0.10---500~1500+5>10~13±0.15---±0.15---300~1200+5>13~16±0.20--------- ...