– 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 bars.
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.
– 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
– 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
– The distance between faces of bearing bars in
rectangular gratings, or between a bent connecting bar and a bearing
bar in a riveted grating.
– The connecting 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.
Cross Bar Centers
– The distance center-to-center of the cross
– A cutout following a curved pattern.
– An area of grating removed to clear an obstruction or to
permit pipes, ducts, columns, etc. to pass through the grating.
– A process of combining hydraulic pressure and
heat fusion to forge bearing bars and cross bars into a panel grid.
– The coating, commonly paint or galvanizing, which is applied
to the grating.
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 sectional shape of
the letter “I”. (Commonly with a striated
– Refer to Span of Grating
Load Carrying Band
– see Band
– 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.
Radially Cut Grating
Pressure Locked Grating –
Bearing bars are locked in position by
cross bar deformation instead of riveting
or welding. Several proven methods
• Expansion of an extruded or drawn
tubular cross bar
• Extruded cross bar deformed or
swaged between bearing bars
• Press assembly of rectangular
cross bars into slotted bearing bars
– Rectangular grating which is cut into panels
shaped as annular segments, for use in circular or annular areas.
– A sinuously bent connecting bar extending between
two adjacent bearing bars, alternately contacting and being riveted to
– The distance center-to-center of rivets along one
– 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
Span of Grating – The
distance between points of grating
support, or the dimension of the
bearing bars in this direction.
Straight Cut – Portion of
the cut edge or cutout of a grating
which follows a straight line.
– A method of altering the cross-section shape of a metal bar
by pressure applied through dies.
– 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.
– A panel of grating having carriers and a nosing attached by
welding, and designed specifically to serve as a stair tread.
– see Band
– Grating in which the bearing bars and cross bars
are joined at their intersections by either electro-forging or conventional
– The overall dimension of a grating panel, measured perpendicular
to the bearing bars, and in the same direction as the cross bars.