Term Definition
Anchor A device by which grating is attached to its supports.
Banding A flat welded to a side or end of a grating panel, or along the line of a cutout, and extending neither above nor below the bearing bars.
Bearing Bars Load-carrying bars made from steel strip or slit sheet or from rolled or extruded aluminum and extending in the direction of the grating span.
Bearing Bar Centers The distance center-to-center of the bearing bars.
Clear Opening The distance between faces of bearing bars in a rectangular grating, or between a bent connecting bar and a bearing bar in a riveted grating.
Cross Bars The connecting bars, made from steel strip, slit sheet, or rolled bars, or from rolled or extruded aluminum, 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.
Cross Bar Centers The distance center-to-center of the cross bars.
Curved Cut An area of grating removed to clear an obstruction or to permit pipes, ducts, columns, etc. to pass through the grating.
Finish The coating, usually paint or galvanizing, which is applied to the grating.
Grating An open grid assembly of metal bars, in which the bearing bars, running in one direction, are spaced by rigid attachment to cross bars running perpendicular to them or by bent connecting bars extending between them.
Hinged Panels Grating panels which are hinged to their supports or to other grating parts.
I-Bar An extruded aluminum bearing bar having a cross sectional shape resembling the letter "I".
Load-Carrying Band A band used to transfer the load between bearing bars.
Nosing A special L-section member serving as the front or leading edge of a stair tread, or of grating at the head of a stair.
Pressure-Locked Grating Pressure-locked means bearing bars are locked in position by cross bar deformation instead of riveting or welding.
Radially Cut Grating rectangular grating which is cut into panels shaped as annular segments, for use in circular or annular areas.
Reticuline Bar A sinuously bent connecting bar extending between two adjacent bearing bars, alternately contacting and being riveted to each.
Reversible Grating Grating so constructed that it may be installed either side up, with no difference in appearance or carrying capacity.
Rivet Centers The distance center-to-center of rivets along one bearing bar.
Riveted Grating Grating composed of straight bearing bars and bent connecting bars, which are joined, at their contact points, by riveting.
Serrated Grating Grating which has the top surfaces of the bearing bars or cross bars, or both, notched.
Span of Grating The distance between points of grating support, or the dimension of the bearing bars in this direction.
Straight Cut That portion of the cut edge or cutout of a grating which follows a straight line.
Swaging A method of altering the cross-sectional shape of a metal bar by pressure applied through dies.
Toe Plate A flat bar attached flat against the outer edge of a grating or rear edge of a tread, and projecting above the top surface of grating or tread to form a lip or curb.
Tread A panel of grating having carriers and nosing attached by welding, and designed specifically to serve as a stair tread.
Trim Band A band which carries no load, but is used to improve appearance.
Welded Grating Grating in which the bearing bars and the cross bars are joined at all of their intersections by either a resistance weld or conventional hand welding. A resistance weld is obtained by the heat produced by the resistance of the material to the flow of electric current causing the material to become plastic. At this point, the pressure on the cross bar is rapidly increased causing the cross bar to penetrate the bearing bar so that they are fused together.
Width The overall dimension of a grating panel, measured normal to the bearing bars.
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