A Smooth, uniform, round or square edge, either slit or filed or slit and edge rolled as specified, width tolerance +- .005".
No. 2 Edge
A natural round mill edge carried through from the hot rolled band. Has not been slit, filed, or edge rolled. Tolerances not closer than hot-rolled strip limits.
No. 3 Edge
Square, produced by slitting only. Not Filed. Width tolerances close.
No. 4 Edge
A round edge produced by edge rolling either from a natural mill edge or from slit edge strip. Not as perfect as No. 1 Edge. Width tolerances liberal.
No. 5 Edge
An approximately square edge produced by slitting and filing or slitting and rolling to remove burr.
No. 6 Edge
A square edge produced by square edge rolling, generally from square edge hot-rolled occasionally from slit strip. Width tolerances and finish not as exacting as No. 1 Edge.