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Bar Grating Glossary |
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Common Bar Grating Terms:
 Bar
grating terms section of our catalog (PDF)
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 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.
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 tread.
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:
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 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 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 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”.
Length:
The dimension of a grating
panel measured parallel to the bearing bars. Also referred to as
span.
Load-Carrying Band:
A band used in a cutout to transfer the load from unsupported bearing bars in
the cutout to the supported 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:
Grating
in which the cross bars are mechanically locked to the bearing
bars at their intersections by deforming or swaging the metal.
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 direction of
this dimension. Also referred to as length.
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.
Toeplate:
A
flat bar attached 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 chiefly to improve appearance.
Welded Grating:
Grating in which
the bearing bars and cross bars are joined at their intersections
by a weld.
Width:
The overall dimension of a grating panel,
measured perpendicular to the bearing bars, and in the same direction
as the cross bars.
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