Anchor- A device by which grating is attached to its supports.
Band- A flat bar welded to the end of a grating panel, or along the
side of a cutout, and extending neither above nor below the bearing
Load Carrying Band- A band used to transfer load between bearing bars.
Trim Band- A band which carries no load, used primarily for appearance and
closing open ends.
Bearing Bars- Load-carrying main elements made from steel, aluminum or
stainless steel, extending in the direction of the grating span
Bearing Bar Centers- The distance center-to-center of the bearing bars.
Carriers- Flats or angles which are welded to the grating panel and nosing
of a stair tread and are bolted to a stair stringer to support the
Clear Opening- The distance between faces of bearing bars in rectangular
gratings, or between a bent connecting bar and a bearing bar in a
Cross Bars- The connecting bars which extend across the bearing bars, usually
perpendicular to them. The 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- A cutout following a curved pattern.
Cutout- An area of grating removed to clear an obstruction or to permit
pipes, ducts, columns, etc. to pass through the grating.
Electro-Forged- A process of combining hydraulic pressure and heat fusion to
forge bearing bars and cross bars into a panel grid.
Finish- The coating, usually paint or galvanizing, which is applied to
Flush-Top Grating- A type of pressure-locked grating in which the cross bars and
bearing bars are in the same plane relative to the top surface of
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 Panel- Grating panels which are hinged to their supports or to other
I-Bar- An extruded aluminum bearing bar having a cross section shape of
the letter "I".
Length- Refer to Span of Grating
- 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. Several
proven methods include:• Expansion of an extruded or drawn tubular
• Extruded cross bar deformed or swaged between bearing bars;
• Press assembly of rectangular cross bars into slotted bearing
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.
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-section shape of a metal bar by
pressure applied through dies.
Toe Plate- A flat bar attached against the outer edge of a grating or rear
edge of a tread, and projecting above the top surface of the
grating or tread to form a lip or curb.
Tread- A panel of grating having carriers and a nosing attached by
welding, and designed specifically to serve as a stair tread.
Welded Grating- Grating in which the bearing bars and cross bars are joined at
their intersections by either electro-forging or conventional hand
Width- The overall dimension of a grating panel, measured perpendicular
to the bearing bars, and in the same direction as the cross bars.