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How to Choose Steel Grating Thickness for Various Applications?

How To Choose Steel Grating Thickness

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A sequence of metal sheet or carbon steel bearing bars that have been welded stainless steel grating together to form perpendicular bars make up steel grating. This produces a panel that can support a lot of weight. They are frequently utilized in paper mills, chemical plant walkways, and oil rigs.

Those who want to make one must first become proficient at measuring the grating. To choose steel grating thickness for various applications, you have to start with its length, then determine its thickness and depth, and lastly, end with the width.

For steel grating to handle the required weight loads, precise measurements are required. Continue reading to learn more about it if you are a business owner or contractor seeking high-quality steel.

The Importance of Selecting the Right Steel Grating Thickness

Hot-dipped Galvanized steel grating


The intended purpose of the grating must be taken into account while selecting the materials. Is it simply employed to grate walkways? Or a bookcase? Does the gating have to be passed through by the vehicles?

In these situations, you must make sure that the grating is strong enough to ensure that the right materials were chosen. Each type of material has special qualities and uses. Especially when you’re looking for the type of metal grating, like for street drains that have an aesthetic appeal and improved architectural applications.

Accurate sizing

There are various ways to split grating depending on the varying load, place, use, technique of application, and customer needs. Including the top surface, the swaging process, and different industrial products.


In general, there are two different surface shapes for grating. One is the serrated surface, while the other is smooth. To improve the anti-slip performance, we typically serrate the grating surface. Especially when it comes to drainage covers, it is expected to be pressure locked, heavy-duty, have infill panels, slip resistance and have industrial applications.

Carrying capacity

There are various carrying capacities for carbon steel gratings. Steel gratings with tiny pitches often have a high carrying capacity, while those with big pitches typically have a low carrying capacity. According to the strength-to-weight ratio, we will select the appropriate carrying capacity. Determine the load circumstances, effective unsupported clear span, flooring surface, trim, and finish when specifying carbon steel gratings properly.

The specifying authority will be able to choose items that will offer years of continuous service by carefully taking into account these factors as well as any attributes specific to their particular application.

Factors to Consider When Choosing Steel Grating Thickness

Load carrying capacity

The thickness of a welded steel grating not only affects the product weight in a significant way but also determines the welded steel grating’s load-carrying capacity.

One form of thickness is the thickness of a single thick bearing bar, while the other type of thickness is the overall thickness of the entire welded steel grating, also known as the depth of the thick bearing bars.

There are typical types of 3mm, 4mm, and 5mm for the thickness of a single-bearing bar.

Load capacity

The load capacity is significantly more influenced by the stainless steel grating’s overall thickness. The load capacity of stainless steel grating varies depending on its size, as does its suitability for usage in daily life.

Generally speaking, the load capacity increases with thickness. To provide a detailed justification for ventilation grates and airflow of the aluminum and stainless steel.

Load capability

Its load capability reaches a medium level for stainless steel grating with a thickness of 20 to 40 mm, making it suited for locations with limited spans and with people moving around.

This kind of stainless steel grating is typically utilized as a pedestrian walkway, industrial floor, cargo rack, etc. in parks, overpasses, subways, equipment factories, and other fields.

Its load capability is fairly robust for the thickness range of 40-70mm. It is frequently used for loading machines or vehicles, serving as a big operational platform, a gutter drainage cover plate, and other things in the car wash house, sewage treatment plant, oil refinery, and other fields.


When it comes to specific work environments that have unique demands for the load capacity of stainless steel gratings, such as a port or a wharf, large construction sites, chemical engineering fields, and offshore oil drilling platforms, it is typically the design organization or the user organization to customize the thickness and other specifications.

Including thick bearing bars height and bearing bars pitch during the production of stainless steel gratings according to the drawings also results in an attractive architectural appearance.

Unit of measurement

For purposes of general standards, we frequently use one inch as the unit of measurement for stainless steel grating thickness. Additionally, a number that is surrounded by double quotes, such as 1″, denotes one inch. Regularly a sixteenth of an inch or a quarter of an inch, also participates in showing the thickness. For instance, 1-3/16″ denotes one and three-sixteenths of an inch, and 1-1/4″ denotes one inch and a quarter.

We hope that these suggestions will make it easier for you to swiftly select the ideal stainless steel gratings measurement of thickness if you are looking for bearing bars for your projects.

How to measure and indicate thickness in general specifications

steel grating operating platform

Here is the electro-forging process on how to measure and indicate thickness in general specifications accurately:

Beginning with the length

The majority of the weight is supported by the bearing bars. It might be a flat or serrated surface, among other variations. It is essential that you start with these bearing bars when estimating the dimensions for bearing bars grating.

Both the total length of the bearing bars and the distance between them are included in this. From the first bearing bars center to the second bearing bars center, this should be taken into consideration.

Decide on the thickness and depth

Next, measure the depth and thickness of the bearing bar with a ruler or tape measure. To ensure durability, the bearing welded bar grating must be at least 3/16 of an inch thick.

Finish with width

Go on to the cross bars now that you have the dimensions for your bearing bars. The connecting bearing bar is another name for the cross bar. Measure the distance between the centers of the bearing bars once more in inches in the riveted grating. These cross bars should typically be spaced two to four inches apart.

How to Choose the Thickness of Steel Grating for Different Applications

Here is the checklist for choosing the thickness of steel welded bar grating for different applications:

  • The thickness of the rectangular bearing bars in inches
  • Depth of bearing bars in inches
  • The center-to-center distance between bearing bars in welded and press-locked welded bar grating is in inches.
  • The concentrated load at mid-span which can be measured by pounds per foot of width
  • The deflection under concentrated load in inches of the metal bars
  • The deflection under uniform load in inches of the deep cross bar
  • The allowable fiber unit stress of its wire mesh
  • The positive mechanical connection of parallel bars
  • The intersecting wires to do commercial applications to have a positive fused connection


It is also referred to as the connecting bearing bars that are measured inches from center to center of the cross bars and measured along a single bearing bar.


It is expressed in inches of thickness and depth of the bearing bars in the riveted grating.


It is also referred to as the connecting bearing bars that are measured inches from center to center of the cross bars and measured along a single bearing bar.

Additional Tips for Determining the Thickness of Steel Gratings

There are many considerations to be made when selecting steel bar grating, so it’s critical that you get your materials from a reputable and experienced supplier that can help you identify the best metal grading sheet grating option for the particulars of your project. Make sure to do these things in order to locate a provider:

Ask an expert

Speak with a specialist about the different bar grating types, metal sheet types, sheet thicknesses, sizes, finishes, and so on. Your supplier should be able to answer all of your inquiries and give you recommendations on what specs are best for your needs.

Comply with the standards

Make sure they adhere to the requirements for steel bar grating; organizations to look for include the American National Standards Institute (ANSI) for safety barriers.

Common Problems with the inappropriate thickness of Steel Gratings


Span performs a dual function in bar grating terminology by defining two important properties.

  • Unsupported span denotes the space between the bar grating’s actual points of support. The specifier will choose the bar grating by determining the maximum unsupported span and referencing the load tables once the design load and acceptable deflection parameters have been established.
  • The span describes the whole final length of the bearing bar grating panels as they are given to the customer (parallel to the bearing bars).


The panel width is the total dimension of the bearing bar grating panel measured perpendicular to the bearing bar span. Bar grating panels are typically produced and stocked in nominal widths of 24″ and 36″, but they can readily be supplied in a range of widths to meet the requirements of any application for non-stock widths in cold stamping. Additionally, shop fabrication of wire fabric of bespoke widths is possible to hold any required close tolerance slotted bars.


The open ends of the bar grating panels can be banded to improve architectural aesthetics or add more transverse rigidity. To do this, the cut ends of the notched bearing bar grating panel are welded to a flat bearing bar that is about the same size as the bearing bars providing it the corrosion-resistant feature. By shifting loads to adjacent bearing bars that aren’t immediately under service loads, banding helps lessen impact stresses.


Numerous industrial flooring uses, such as manufacturing platforms, walkways, stair treads, trench coverings, fences, and ceilings, frequently use steel bar gratings. It provides high strength, superior corrosion resistance, considerable carrying capacity, and personnel safety. For a variety of applications, it is crucial to understand the precise thickness measurement.

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