This PDF provides a diagram

and explains bar grating terminology

span of bar gratings to safely support people.

This PDF provides load and deflection ratings for        bar grating to safely support people

This PDF provides information on stair treads.

This PDF provides information for ADA handicapped bar

grating to allow wheelchair access

This PDF provides information on the maximum

span of heavy duty gratings to safely support vehicles.   

This PDF provides the out to out dimensions of the bearing bars for heavy duty grating.