Manufacturing and Fabricating Excellence



Heavy Duty Welded Grating

Heavy Duty Welded Grating Product Information

Welded Heavy Duty Gratings are designed to service applications subject to heavy rolling and static loads such as highways, plant floors, loading docks, inlet covers and airports. Since these conditions can range from light-duty forklifts to heavy-duty truck or aircraft traffic, heavy duty gratings are manufactured in a wide range of bar sizes and spacings.
Vehicular loads are designed in conformance with current AASHTO specifications for classifications H-15 through H-25. Automobile and forklift loads are similarly evaluated with loads calculated and distributed in accordance with the “Maximum Traffic Conditions”. If your application is not adequately addressed by these load conditions, please contact our engineering department and we will gladly assist in the selection of a heavy duty grating to satisfy your specific needs.
Heavy Duty Bar Gratings are manufactured in carbon steel and 300 series stainless steels.


Heavy duty gratings are commonly subjected to shock and impact loads and it is highly recommended that all open ends be banded. The welded band bar helps distribute impact loads and minimizes distortion when subjected to repetitive traffic patterns. Banding details can be found under Banding/Layout/Fasteners.

Serrated Surface

Optional serrated bearing bars enhance skid resistance. Consider this surface for applications subject to the accumulation of liquids or lubricants or inclined grating installations.

Tables and Charts

Load Tables

Table of Spacing

Heavy Duty Welded Grating Finishes

Carbon Steel Heavy Duty Bar Grating is usually provided with bare steel (no finish), painted with one coat of IG EcoCoat™, or hot dip galvanized in accordance with ASTM A-123.
Due to discolorization that occurs during welding and fabrication, Stainless Steel Heavy Duty Bar Grating typically require secondary cleaning. IG EcoClean™, abrasive blasting, and passivation provide a uniform and clean surface. 
All heavy duty grating can be provided with specialty finishes including enamel or epoxy paints or powder coating. When considering specialty finishes, consultation with the coating manufacturer is essential.

Mill Finish

Products left unfinished will display discoloration from welding, cutting and grinding. Satisfactory for industrial or process applications where appearance is not a consideration.

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Hot dip galvanized in accordance with ASTM A-123. Galvanized finish is used to resist rust.

Click here to learn more about our Galvanized Finish.



IG GRITWELD™ utilizes processes developed for thermal sprayed hard surfacing and incorporates anti-skid ingredients to the super hard substrate. IG GRITWELD™ offers the ultimate in traction and longevity for extreme environments.

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IG ECOCOAT™ - Standard Black Paint

IG ECOCOAT™ is an economic and eco-friendly solution. It is dipped in one shop coat of our specially produced gloss black paint providing a protectant cover.

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IG ECOCLEAN™- Stainless Steel

IG ECOCLEAN™ provides a uniform, matte finish by abrasive blasting followed by passivation to move manufacturing contaminants.

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Weld Lugs

Plates punched with holes and shop welded between the bearing bars to facilitate bolting to the supporting structure. Bolts, screws or other connecting hardware shall be supplied by others.

Counter Bore Anchor Tabs

To be used with narrow spacing of close mesh gratings that require a solid fastener. Counter bore allows for the use of self-drilling fasteners which are recessed below the top surface.   Bolts, screws or other connecting hardware shall be supplied by others.  

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