... of Steel Bar Grating 1)The shape of bearing bar: Plain type (may be omitted in the symbol of steel grating), Serrated type ... fencing, ramp, dock, trench cover, drainage pit cover, maintenance platform, pedestrian/crowded pedestrian, factory, workshop, motor rooms, trolley ... of length is +0/-5mm, while the allowed deviation of width is +/-5 mm. The non-perpendicularity of bearing bar is allowed ...