Metal Bar Gratings

Steel Grating an Affordable and Recyclable Alternative for Many Purposes

Steel grating used as drainage cover

Advantage of using steel grating as floor lies in its recyclability and easy installation.

Manufactured from ASTM A-1011 mild carbon steel, steel grating has been the most popular grating system for most applications including industrial and commercial flooring, buildings, walkways, platforms, safety barriers, drainage covers and ventilation grates. Steel bar grating is available in four fabrication methods - welded, riveted, swage locked and dovetail pressure locked. Each fabrication has its own character.

Steel gratings are often applied by external coating to extend its service life. Hot-dip galvanization and PVC coating protects interior steel from erosion of rains, snows and other elements.

Spacing between bearing bars is very important, which depends on load capability and applications. The standard spacing is 19/16" or 1-3/16". Spacings of 7/16" and 1/2" are ideal for ADA passing through.

Fabrication options:

  • Welded steel gratings;
  • Riveted steel gratings;
  • Swage locked steel grating;
  • Dovetail pressure locked grating.

Surface options:

  • Plain surface;
  • Serrated surface.

Bearing bar specifications:

  • Thickness: 3/16", 1/8", 1/4" 5/16" and 3/8";
  • Depth: 3/4", 1", 1-1/4", 1-1/2", 1-3/4", 2’, 2-1/4", 2-1/2".

Finish options

  • Hot-dip galvanized;
  • PVC coated;
  • Mill-unpainted.
Steel grating spacing table
Item No. Bearing Bar Spacings (inch) Cross Bar Spacings (inch) Open Area (%)
Standard Spacing W-19-4 DT-19-4 SL-19-4 19/16 4 78
Special Spacings W-19-2 DT-19-2 SL-19-2 19/16 2 73
W-15-4 DT-15-4 SL-15-4 15/16 4 75
W-15-2 DT-15-2 SL-15-2 15/16 2 69
W-11-4 DT-11-4 SL-11-4 11/16 4 68
W-11-2 DT-11-2 SL-11-2 11/16 2 63
ADA Spacing W-8-4 DT-8-4 SL-8-4 1/2 4 58
W-8-2 DT-8-2 SL-8-2 1/2 2 54
W-7-4 DT-7-4 SL-7-4 7/16 4 53
W-7-2 DT-7-2 SL-7-2 7/16 2 49


  • W refers to welded steel grating;
  • SL refers to Swage locked steel grating;
  • DT refers to Dovetail pressure locked steel grating.

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