Load carrying bars made from steel strip or slip sheet or from rolled carbon steel in the direction of the grating span.
The connecting bars, made from steel strip, slit sheet, or rolled bars which extend across the bearing bars, usually perpendicular to them. They may be bent into a corrugated or sinuous pattern and, where they intersect the bearing bars, are welded, forged or mechanically locked to them
Bearing bar centers
The distance center to center of the bearing bars
Cross bar centers
The distance center to center of the cross bars
An area of grating removed to clear an obstruction or permit pipes, ducts, columns, etc. to pass through the grating.
Refer to the span of grating.
The overall dimension of a grating panel, . Measured normal to the bearing bars.
A special L-section member serving as the front or leading edge of a stair treads, or of grating at the head of a stair.
A flat bar attached against the outer edge of a grating or rear edge of a tread, and projecting above the top surface of gratings or tread to form a lip or curb
A flat welded to a side or end of a grating panel, or along the line of cutout, and extending neither above nor below the bearing bars.
Load-carrying band: a band used to transfer the load between bearing bars.
Trim band carries no load, but is used chiefly to improve appearance.