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Aluminum bar grating is available for both industrial and
architectural applications, including aluminum plank, wheels-n-heels and
heavy duty steel that satisfy both the vehicle loading requirements of
AASHTO and the pedestrian comfort requirements of the American With
Disabilities Act.
Alloy
Refers to material specification. For Example, the aluminum standard
alloy is 6063.
ALGRIP-2000
Type of surface. This is an applied anti-slip surface.
Anchor
A device by which grating is attached to its support.
Area
A number of grating pieces to fill a specific location or
opening.
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 bar.
Circular band
Banding to close in a curved cut.
Load Band
One side of each bearing bar is welded to band bar, except for close-mesh
grating (see Standard Details).
Load Carrying Band
A band used in a cutout to transfer the load from un- supported
bearing bars in the cutout to the adjacent bearing bars.
Trim Band
A band which carries no load, but is used chiefly to
improve appearance.
Bearing Bar Centers
The distance center-to-center of the bearing
bars (Rivet measured face-to-face of bearing bar).
Bearing Bars
Load carrying bars made from steel strip, slit sheet,
rolled bars, or from rolled or extruded aluminum, and extending
in the direction of the grating span.
Bevel
An angular cut at the ends of the bearing bar.
Bottom Bar/Shim Bar
A bar used to raise height of grating or
wear plate.
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 (End Plates – Carrier Angles).
Chamfer
A small 45% grind on a bearing bar or band bar.
Circular Band
See Band.
Circular Toe Plate
Toe plate / Kick plate attached to a circular
cut.
Claim
A means of reporting, repairing, or tracking non-conforming material.
Clear Opening
The distance between faces of bearing bars in rectangular
grating, or between a bent connecting bar and bearing bar in riveted
grating.
Clear Span
The distance or opening between grating supports.
Close Mesh
Bearing bars spaced close together – Bearing bar center 11/16” or
under.
Connecting Bar
Reticuline bar – riveted grating. Joins
bearing bars.
Cross Rod Extensions
Distance cross rods stick out from outside
bearing bar.
Cross Bar Centers
The distance center-to-center of the cross
bars.
Cross Bars
The connecting bars, made from a steel strip, slit
sheet, 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 Alignment
Using same E.D. (End Dimension) in an area
to cosmetically align each piece/rod.
Curved Cut
A cutout following a curved pattern (Circular Cut).
Deburr
Remove burrs or fringe after cut.
Dove Tail
Pressure lock grating – aluminum or steel.
Egg Crate
Equal size bearing bars and cross bars in which both
bearing bars and cross bars are notched.
Electro-Forged
A process combining hydraulic pressure and heat
fusion to forge bearing bars and cross bars into a panel grid (Forge
Welded – Machine Welded). See Welded Grating.
End Dimension
The distance from an end of grating to center of
first cross rod (except welded Heavy Duty, where distance is from
edge of grating to back of first cross rod).
Equal End Dimensions
The same distance from the end of bar to
center of the first cross rod on both ends of panel.
Filler Bar
A bar welded between two support bearing bars to close
the spacing.
Finish
The coating, usually paint or galvanizing which is applied
to the grating.
Flat
Within tolerance of bow and crown – does not rock
or bounce.
Flattening
A means of making bowed grating flat.
Flush Top Grating
A type of aluminum pressure-locked grating
in which the cross bars and bearing bars are in the same plane
relative to the top surface of the grating using the swaging process.
Gap Weld
Maintaining a 1/16” gap when welding material
to the grating.
Grade
Refers to steel – Heavy duty is ASTM A36; Light Duty is ASTM
A1011 CS Type B.
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.
Grizzly Grate
Heavy Duty bearing bars and cross bars usually large in size where
neither bars are notched. Intersections are typically welded
in all four corners.
Hinge
A device to create movable or swing grating (Piano Hinge – Butt
Hinge – Heavy Duty Butt Hinge – Double Acting Hinge).
Hinged Panels
Grating panels which are hinged to their supports
or to other grating parts.
Hollow Tube
Cross bar in Swage Lock Carbon Steel or Stainless
Steel grating – welded tube 5/16” diameter - .065” wall.
I-bar
An extruded aluminum bearing bar having a cross sectional
shape resembling the letter “I”.
Interlocking Grating
Plank Grating – Snap Lock Plank grating
with male and female sides that lock together.
Intersection
The point where the bearing bar and cross bar intersect
or cross. In heavy duty grating with a rectangular cross bar; an
intersection has four (4) sides.
Length
The dimension of a grating panel measured parallel to
the bearing bars; also referred to as span. (Length – refer
to Span of Grating).
Load Band / Load Carrying Band
See Band.
Longitudinal Bow
Refers to bow along the span. Longitudinal is measured
along the span.
Lugs
See section on Anchoring Devices.
Marking
(Mark Number) Used to identify each unique piece.
Micrometer/ Dial Caliper
A device used to measure thickness or
opening – measures in thousands of an inch.
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. Checker
Plate Nosing (Steel only), Grooved Nosing (Aluminum only), Slip
Not Nosing, Cast Abrasive Nosing, AllGrip Nosing and Fiberglass
Nosing.
Notched Grating
A fabricated corner cut out or small cut out.
Notched Bar
A cut out in the bearing bar. A burn out or punch.
Pack Out
The space allowed between each piece when figuring an
area.
Pallet
A wood platform to stack material for shipments and protection
(Skid).
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 (Pressure-locked means bearing bars are locked
in position by cross bar deformation instead of riveting or welding.
Several proven methods are:
·
Expansion of an extruded or drawn tabular cross bar
·
Extruded cross bar deformed or swaged between bearing bars
·
Press assembly of rectangular cross bars into slotted bearing bars).
Radially Cut Grating
A radius cut, fabricated. A radius is one
half of a diameter. A circular cut out.
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.
Rip
Cut or nip along the width of grating.
Riveted Grating
Grating composed of straight bearing bars and
bent connecting bars, which are joined, at their contact points,
by riveting.
Riveted Centers
The distance center-to-center of rivets along
one bearing bar.
Seal Weld
Welding each bar on sides, top and bottom. Welded completely.
Serrated Grating
Grating which has the top surfaces of the bearing
bars or cross bars notched.
Shop Split
Start with one piece – split into two pieces
to accommodate pipe or obstructions during installation.
Skew Cut
A fabricated diagonal cut.
Skid
A wood platform to stack material for shipments and protection
(Pallet).
SlipNot
Type of surface, (not a finish). An applied gritted anti
skid surface.
Small Diameter Circle
A circle opening made with pipe/banding
and toe plate – a 9-inch diameter or less.
Spacer Lug
A lug without a hole placed as a brace between two
pieces to hold width or stiffen grating.
Spacer Bar
Used to extend width or hold specific widths of plank
grating or units of grating.
Span of Grating
The distance between points of grating support,
or the direction of this dimension; also referred to as length.
Squareness
Measuring end to end diagonally. Used as a tolerance
for grating.
Stitch Weld
Method of welding two pieces of grating together
either by extended and welded together to give appearance of one
piece, or by welding edge bearing bars together.
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 though dies.
Temper
Method of heat treating a material to enhance mechanical properties.
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
grating or tread to form a lip or curb.
Transverse
Refers to bow along width.
Tread
A panel of grating having carriers and nosing attached
by welding and designed specifically to serve as a stair tread.
Trim Band
See Band.
Trim Flush/Grind Flush
No cross rod extension. Rod and outside
bar are flush.
Units
Multiple pieces banded together (Spacer Lugs).
Webster Tester
A device used to test aluminum hardness.
Welded Grating
Grating in which the bearing bars are joined at
their intersections by a weld. Grating in which the bearing bars
and the cross rods 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 they are fused together.
Width
The overall dimension of a grating panel, measured perpendicular
to the bearing bars. The overall dimension of a grating panel measured
normal to the bearing bars.
Note: Italicized definitions are from the NAAMM Catalogue.
Glossary of Terms- Anchoring
Devices
Anchor Block
A recessed piece of ¼” or 3/8” thick
block (made of aluminum or steel) which is shop welded between
two bearing bars to fasten permanent or removable grating panels.
Countersunk Land
Used with close-mesh aluminum grating and drilled
by the manufacturer for use with a ¼”diameter TEK
Screw.
Grating Clamp
A special friction fastener used in conjunction
with bar grating and embedded grating frames.
I-Bar Lug
A fastening device inserted between the flanges of
the bottom of I- Bar grating and secured with a TEK Screw (Camelot
Lug).
Lug
See Anchor Block.
Plank Lug
A fastening device inserted between the flanges of
the bottom of plank grating and secured with a TEK Screw (Camelot
Lug).
Plank Clip
A special friction fastener used in conjunction with
plank grating and embedded grating frames.
Saddle Clip
A special bent-clip type fastener for removable bar
grating panels.
Tack Weld
A positive (welding) method for anchoring all permanently
installed grating.
TEK Screw
A self-drilling / self-tapping screw used to secure
grating. Must be used with an anchoring device.
Z-Clip
A bent clip designed to fasten down riveted grating when
used with a TEK Screw.
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