Ohio Gratings, Inc.
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Alloy:
Refers to material specification. For Example, the aluminum standard alloy is 6063.

Algrip™:
Type of surface. This is an applied anti-slip surface.

Anchor:
A device by which grating is attached to its support.

Anchor Block:
A recessed piece of 1/4" 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.

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.
  • 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 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:
he 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.

Countersunk Land:
Used with close-mesh aluminum grating and drilled by the manufacturer for use with a 1/4" diameter TEK Screw.

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.

Grating Clamp:
A special friction fastener used in conjunction with bar grating and embedded grating frames.

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".

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).

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).

Longitudinal Bow:
Refers to bow along the span. Longitudinal is measured along the span.

Lug:
A recessed piece of 1/4" 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.

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, AlGrip Nosing and Fiberglass Nosing.

Notched Bar:
A cut out in the bearing bar. A burn out or punch.

Notched Grating:
A fabricated corner cut out or small cut out.

Pack Out:
The space allowed between each piece when figuring an area.

Pallet:
A wood platform to stack material for shipments and protection (Skid).

Plank Clip:
A special friction fastener used in conjunction with plank grating and embedded grating frames.

Plank Lug:
A fastening device inserted between the flanges of the bottom of plank grating and secured with a TEK Screw (Camelot Lug).

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.

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.

Saddle Clip:
A special bent-clip type fastener for removable bar grating panels.

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.

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..

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 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.

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.

Z-Clip:
A bent clip designed to fasten down riveted grating when used with a TEK Screw.