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Email Enquiry |
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Contact Information
Phone:
(713) 649-5310
(800) 200-3047
Fax:
(713) 649-5305
Mailing Address
Marco Specialty Steel, Inc.
P.O. Box 750518
Houston, Texas 77275
Physical Address
Marco Specialty Steel, Inc.
9140 Tavenor Ln
Houston, Texas 77075 |
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Welded Bar Grating is the most popular of all grating types due to it's strength, cost efficient production and ease of installation. Universally used in most general industrial plants as well as commercial buildings, it has wide applications as walkways, platforms, safety barriers, drainage covers and ventilation grates.
Welded Bar Grating is resistance welded to create a rugged, one piece constructed panel. The bearing bars are automatically resistance welded at the contact point with the cross bars and, under a combination of high heat and pressure, are fused together to form a permanent joint. The cross bars provide a high degree of rigidity, yet retain a smooth flat surface for free and easy walking.
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Bar Grating Links:
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Most Common Bearing Bar Spacing:
- (19-W-4) 1-3/16" x 4"
- (19-W-2) 1-3/16" x 2"
- (15-W-4) 15/16" x 4"
- (15-W-2) 15/16" x 2"
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Most Common Panel Sizes:
- 24" x 20 FT
- 24" x 24 FT
- 36" x 20 FT
- 36" x 24 FT
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What's it all mean?
Marco Specialty Steel uses a form of the NAAMM alpha numeric designation for bar spacing and manufacturing identification. The first number signifies center-to-center bearing bar spacing in 1/16ths of an inch. (Riveted grating marking indicates space between bearing bars). A letter designates method of manufacture. The last number details center-to-center cross bar spacing in whole inches (usually 4" or 2"), or rivet spacing (usually 3-1/2", 5", 7").
Method of manufacture and their letter designations used include:
| SG |
Swaged Rectangular Bar |
| SGF |
Swaged Flush Top |
| SGI |
Swaged I-Bar |
| W |
Welded Steel |
| R |
Riveted (Steel) |
| AR |
Riveted (Aluminum) |
For example:
| 19-W-4 |
- Bearing Bars on 19/16th Centers (1-3/16th )
- Welded Steel Construction
- Cross Bars 4" Centers
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| 15-SGI-2 |
Bearing Bars on 15/16th Centers
- Swaged I-Bar
- Cross Bars 2" Centers
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Other Bearing Bar Spacing commonly used throughout the industry are designated:
| 38-W-4 (or 2) |
Bearings Bars on 38/16th Centers (2-3/8") |
| 30-W-4 (or 2) |
Bearings Bars on 30/16th Centers (1-7/8") |
| 22-W-4 (or 2) |
Bearings Bars on 22/16th Centers (1-3/8") |
| 11-SG-4 (or 2) |
Bearings Bars on 11/16th Centers |
| 7-SG-4 (or 2) |
Bearings Bars on 7/16th Centers |
| 18-R-7 (or 3-1/2) |
Bearings Bars on 18/16th Face to Face (1-1/8") |
| 37-R-5 |
Bearings Bars on 37/16th Face to Face (2-5/16") |
| 12-R-7 (or 3-1/2) |
Bearings Bars on 12/16th Face to Face (3/4") |
Note: Riveted Grating marking indicates space between bearing bars.
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19-W-4 Spacing
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19-W-2 Spacing |
Bar Grating Weights Per Square Foot*Highlighted Items represent 80-90% of All Bar Grating usage.
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Bearing Bar Size
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19-W-4
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19-W-2
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15-W-4
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15-W-2
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3/4" x 3/16"
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5.5*
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6.0
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6.6
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7.3
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1" x 1/8"
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4.9
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5.5
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5.9
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6.6
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1" x 3/16"
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7.1*
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7.2
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8.6
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9.2
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1" x 1/4"
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9.2
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10.0
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11.5
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12.3
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1-1/4" x 1/8"
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6.0
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6.4
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7.2
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7.8
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1-1/4" x 3/16"
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8.7*
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9.0
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10.4
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11.1
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1-1/4" x 1/4"
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11.4
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12.0
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14.1
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14.9
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1-1/2" x 1/8"
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7.1
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7.5
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8.3
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9.1
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1-1/2" x 3/16"
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10.3*
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10.6
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12.4
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13.0
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1-1/2" x 1/4"
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13.5
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14.2
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16.8
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17.6
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1-3/4" x 3/16"
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12.1
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13.2
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14.6
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15.4
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1-3/4" x 1/4"
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15.7
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17.4
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19.9
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20.8
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2" x 3/16"
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13.8*
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14.8
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16.7
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17.5
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2" x 1/4"
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18.1
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19.1
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22.6
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23.7
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2-1/4" x 3/16"
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14.8
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15.7
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18.5
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19.4
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2-1/4" x 1/4"
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20.0
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21.1
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25.4
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26.2
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2-1/2" x 3/16"
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17.0
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17.2
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20.5
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21.3
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2-1/2" x 1/4"
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22.1
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23.2
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28.1
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29.0
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Definitions: - 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.
- Load Carrying Band: A band used in a cutout to transfer the load from unsupported bearing bars in the cutout to the supported bearing bears.
- Trim Band: A band which carries no load, but is used chiefly to improve appearance.
- 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 patter 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
- see BAND.
- 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, alternating 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.
- 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.
- Tread
- A panel of grating having carriers and 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 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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Please review the following Ordering Information:
Consider:
- Application or use of product
- Physical requirements
A. Loading B. Environment C. Percent of Open Area
- Type: Rectangular Bar, I-Bar, Plank, Fiberglass Product Name, etc.
- Construction: Welded, Swage locked, Press locked, etc.
- Material: Plain steel, aluminum, stainless steel, fiberglass, etc.
- Finish: painted black, galvanized, special, if any.
- Quantity: number of panels, areas, planks, walkways, treads or rungs-full size or cut pieces required.
- Height: bar, plank, or panel height as applicable
- Width: width of panel, plank or pieces - specify tolerances, if any
- Length: length of panel, plank or pieces - specify tolerances, if any
- Surface: plain, serrated, grit, grooved, if any
- For Rectangular Bar, I-Bar or T-Bar panels: indicate spacing between bearing bar centers and cross bar centers.
- Indicate Span direction of bearing bars.
- Special Fabrication: banding requirements, lugs, bolt holes, etc., if any
- Fasteners type, size, hardware.
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Call your Bar Grating specialist today! 1-800-200-3047
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