Bar Grating

Welded Bar Grating & Press Locked Grating

For bar grating, and fabricated bar grating, Marco Specialty Steel is one of the fastest growing suppliers in the United States. We also service Mexico and customers around the World. We inventory thousands of panels of grating and stair treads, ready for immediate shipment, as well as custom fabrication of all grating products. So whether your needs simply require stock panels, or you need a completely engineered and fabricated, turn-key job delivered with construction drawings and corresponding pieces tags, we're ready to help! All Marco grating is manufactured and fabricated to exacting NAAMM standards and back by our tradition of quality and excellence.


Bar Grating Products:

Bar Grating Overview

Welded Bar Grating is the most popular of all grating types due to its 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.

in stock bar grating

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.

Stock Panels and Standard Stair Treads

We inventory thousands of panels of grating and stair treads, ready for immediate shipment. Panels are available in smooth or serrated surface. Standard carbon steel panels are available in mill finish, hot dip galvanized or powder coat painted finish; stainless steel comes standard in mill finish. Standard panels are available in 2'-0" or 3'0" wide by 20'-0" or 24'-0" span. Special length panels can be custom manufactured on our "Run-To-Length" line and can be produced to almost any non-standard length, to suit your exact application or end use. If required, many specifications are available as domestically produced and meet the "Buy American Recovery Act" provisions, or as DFAR compliant (DFAR Clause 252.225-7014.) Contact one of our experienced sales staff to discuss how we can work together to meet your specific needs.

Fabricated Bar Grating and Stair Treads

Whatever your fabricated grating application, whether it's a small trench grate, or a large complex structure with cut-outs and toe plates, Marco can provide a solution. Marco can also offer complete turnkey service including engineering and design, fabrication, shipping, and field erection drawings for large scale projects such as new construction, or refurbishment projects. We provide expert assistance with design, estimating, sales, engineering, project management, prompt accurate quotations, and site installation consulting.

As for stair treads, Marco stocks and fabricated virtually every variety; and all are made to meet the same quality standards as all of our fabricated grating. In addition, we can supply checkered plate nosings and cast aluminum abrasive nosings to maximize the safety of your stair treads.

Also available as stock or fabricted items:

  • Pressure-Locked Bar Grating
  • Swage-Locked Bar and I-Bar Grating
  • Riveted Bar Grating
  • Aluminum Grating
  • Stainless Steel
  • Fiberglass Grating
  • Safety Grating (Grip-Trac Safety Grating and Perf-Trac Safety Grating)

Bar Grating
Charts

Weight Charts

Bar Grating Weights Per Square Foot
*Highlighted Items represent 80-90% of All Bar Grating usage.

Bearing Bar Size

19-W-4

19-W-2

15-W-4

15-W-2

3/4" x 3/16"

5.5*

6.0

6.6

7.3

1" x 1/8"

4.9

5.5

5.9

6.6

1" x 3/16"

7.1*

7.2

8.6

9.2

1" x 1/4"

9.2

10.0

11.5

12.3

1-1/4" x 1/8"

6.0

6.4

7.2

7.8

1-1/4" x 3/16"

8.7*

9.0

10.4

11.1

1-1/4" x 1/4"

11.4

12.0

14.1

14.9

1-1/2" x 1/8"

7.1

7.5

8.3

9.1

1-1/2" x 3/16"

10.3*

10.6

12.4

13.0

1-1/2" x 1/4"

13.5

14.2

16.8

17.6

1-3/4" x 3/16"

12.1

13.2

14.6

15.4

1-3/4" x 1/4"

15.7

17.4

19.9

20.8

2" x 3/16"

13.8*

14.8

16.7

17.5

2" x 1/4"

18.1

19.1

22.6

23.7

2-1/4" x 3/16"

14.8

15.7

18.5

19.4

2-1/4" x 1/4"

20.0

21.1

25.4

26.2

2-1/2" x 3/16"

17.0

17.2

20.5

21.3

2-1/2" x 1/4"

22.1

23.2

28.1

29.0


Bar Grating Load Charts | Load and Deflections Tables

All measurements are center to center of bearing bars.

STEEL BAR
Welded & Press Locked 19-W-4 (1-3/16")
15-W-2 (15/16")
Welded Close-Mesh & Press Locked
Close-Mesh 
13-W-4 (13/16")
11-W-4 (11/16")
10-W-4 (5/8")
8-W-4 (1/2")
Press-Locked Close-Mesh  7-P-4 (7/16")
Stainless Welded & Stainless Press-Locked  19-S-4 (1-3/16")
19-SP-4 (1-3/16")
Railroad Grating (AAR Approved)  25-W-4 (1-9/16")
27-W-4 (1-11/16") 
HEAVY DUTY STEEL
Heavy Duty Welded 15-H-4 (15/16")
19-H-4 (1-3/16") 
22-H-4 (1-3/8")
30-H-4 (1-7/8")
38-H-4 (2-3/8")
 ALUMINUM GRATING
I-Bar Swage Locked 19-SI-4 (1-3/16")
15-SI-4 (15/16")
11-SI-4 (11/16") 
I-Bar Swage Locked Close-Mesh 8-SI-4 (1/2")
Rectangular Bar Swage-Locked & Press Locked 19-SR-4
19-AP-4
(1-3/16")
  15-SR-4
15-AP-4
(15/16") 
Press-Locked Close Mesh 13-AP-4 (13/16")
Rectangular Bar Swage-Locked Close Mesh &
Press-Locked Close Mesh
11-SR-4
11-AP-4
(11/16")
10-AP-4 (5/8")
8-SR-4
8-AP-4
(1/2") 
7-AP-4 (7/16")
Duo Grip™ Extruded Table of Safe Spans
RIVETED GRATING
Steel Riveted Grating 18-R-7 (1-1/8")
12-R-7 (3/4")
Aluminum Riveted Grating 18-AR-7 (1-1/8")
12-AR-7 (3/4")
RIV-DEXTEEL® BRIDGE DECK GRATING
Basics for Design  Load Distribution per AASHTO

Bar Grating
Specs & Info

Manufacturing Tolerances


Download this sheet as a PDF: Manufacturing Tolerances


Definitions & Terms

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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