TERMINOLOGY

Grating Span (Length of Grating) Width of Grating Plain load bearing bar
A steel grid formed from load bearing bars and cross bars through resistance welding. Direction of the load bearing bars. Direction of the cross bars. Flat load bearing bar with plain top surface.
Serrated load bearing bar Pitch Binding bar Grating gross area
Flat load bearing bar with serrated top surface The Centre to centre distance between load bearing bars or cross bars. Flat bar welded to shaped panels at each end and at cut outs. Total area of gratings including cut-out areas.
Grating nett area Cut -out Straight shaping  Curved shaping
   
Total area of gratings excluding cut-out areas. Area of grating cut out for pipes and columns to pass through.  Cut-out with straight edges.  Cut-out with curved edges.
Toe plate Curb angle Erection clearance  Stair tread
   
Larger size flat bar welded to the edge of grating panels for safety purposes. A support fixed to concrete or steelwork to support gratings.  The distance from a grating panel to an adjacent panel or structure.  A grating with end plates and non-slip nosing for use in stairways.
End Plates Non-slip nosings
Plates welded to each end of a stairtread to permit fixing to steelwork. Special anti slip bar welded to stairtreads or gratings to prevent slipping.