The main difference between the two gratings is the mode of production.
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Welded steel grating
It is a steel grating fixed by pressure resistance welding in the each intersection point of bearing bar and cross bar, and the cross bar is generally used by square steel or twisted steel. It provides a robust structure, high strength and great carrying capacity. It is commonly served as walkways, stair treads, fences, floors, etc.
Figure 1: Welded steel grating for desks and seats
Figure 2: Welded steel grating for security fence
Press-locked grating
It is a steel grating fixed through the pressure to make the cross bar into the pre-open flat steel in the each intersection point of bearing bar and cross bar, and the cross bar is usually flat steel. It offers a stable connection and an attractive appearance. It is widely used in factories, civil and commercial buildings for stair treads, trench covers, floors, platforms, fences, etc.
Figure 3: Press-locked steel grating for pipeline cover
Figure 4: Press-locked steel grating for wall cladding
The features of the two gratings are similar. You can choose according to your own will.
Figure 5: Welded steel grating fixed by pressure resistance welding.
Figure 6: Press-locked grating fixed through the pressure to make the cross bar into the pre-open flat steel.
When you choosing materials, you must consider the expected use of the grating. Is it used only for grating walkways? Or a shelf? Does the vehicles need to pass through the gating? In these cases, you must ensure that the grating has adequate strength to ensure the correct choice of materials.
Each material has its unique characteristics and applications. Here we’d like to introduce it briefly to help you choose the right material.
Material Features Application Galvanized steel Economical, high strength, excellent corrosion resistance Suitable for platforms and walkways in petrochemical, power plants, municipal engineering, etc. Low carbon steel Economical, excellent ductility, great welding and stamping properties. Suitable for municipal construction, interior decoration, building materials, platform aisles, etc. 304 stainless steel Great corrosion resistance, heat resistance and high tensile strength Suitable for chemical plants, food plants, power plants and wastewater treatment and other applications require high temperature operations. 316 stainless steel Compared with 304 stainless steel, it has better corrosion resistance and pitting resistance, greater heat resistance For chemical, pulping and paper processing, textile equipment, petroleum refining, etc. Aluminum Light weight, great corrosion resistance and attractive appearance Widely used in indoor ceilings, outdoor curtain walls, other decorative applications and mechanical equipment maintenance platforms.The common mesh size of welded steel gratings is 33 mm × 33 mm and 34 mm × 38 mm. According to the different load, place, use, method of application and the requirements of customer, there are different ways to divide grating mesh.
Figure 7: Larger mesh allows more light to pass through.
Figure 8: Smaller mesh prevents objects from falling off.
Figure 9: Galvanized welded bar grating.
Figure 10: Powder coated steel grating.
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Generally speaking, there are two kinds of surface shape of grating. One is smooth and the other is serrated. We usually make the grating surface into serrated to increase the performance of anti-slip.
Figure 11: Smooth surface welded steel grating.
Figure 12: Serrated surface welded steel grating.
Bar Grating Anchoring Devices
Marco Specialty Steel has all the bar grating accessories and clip assemblies you need.
When the grating is designed to be removable or when welding is not practical, consider these mechanical fasteners. The minimum fastener spacing for pedestrian applications is equal to the minimum weld pattern illustrated below.
The saddle clip bridges two bearing bars and is attached with 1/4″ self-tapping bolt, 1/4″ self threader, 1/4″ weld stud or 1/4″ bolt and nut when hole is drilled through supporting flange. Available for 15/16″, 1-3/16″ and 1-3/8″ bearing bar spacings (15, 19 and 22 space) in carbon and stainless steel. Fasteners should be specified separate from clips. (Fasteners available in Self tapping, or Bolts with nuts and washers included).
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Fastens grating to a horizontal-facing steel structural member edge.
The model GG- describes an assembly of fastener parts identical but for materials of construction, that each contain three common parts. First is a G-Clips unique top for better holding strength and to suit 19W4 grating. Second, a G-Clips patented bottom connects to the beam underside. A hex-headed cap screw connects the two, and its length suits the grating height being installed.
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The Type GF Grate-Fast Fastener enables rapid and secure connection of open grate flooring to steel sections. Grating can be connected by one man only, working from above, without the need to drill the steel, or weld on site.
The standard product (LGF037) consists of a pre-assembled top-hat bracket, socket head cap screw and body casting and provides the additional benefit of increased clamping force over lower quality clips.
For specific applications, it can be supplied with an off-set top-hat bracket (see option 2) to accommodate non-standard grating bars.
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The most versatile clip anchor available is the Z Clip. These clips are especially helpful in holding down riveted grating. Z Clips are manufactured from stainless steel and are available in 1(1 and 1-1/4 grating) 1-1/2 (1-1/2 and 1-3/4 grating) and 2(2, 2-1/4 and 2-1/2 grating) with a pre-punched hole to accept a 1/4 bolt or TEK screw.
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Weld lugs may be used for installations where grating is subject to removal. Weld lugs are shop fabricated and must be specified at time of grating order. Fasteners are 1/4 minimum and supplied by others. Location is the same as Attachment Locations diagram.
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When bar grating needs to be a permanent installation, fasten bar grating in place by securing welding panels to the supporting structure. The diagram below shows the recommended minimum weld size and spacing for pedestrian applications.
Applications where there will be vehicular traffic usually require additional welding, size and spacing as determined by the specifying authority.
Attachments should be placed at intermediate supports in the middle of the panels and at four bearing bar ends, 6 from each side of panel. Welds should be 3/16 fillet welds, 3/4 long. Heavy-Duty grating may require additional welding to meet application needs.
Marco Specialty Steel has an unrivaled track record dating back to for providing fast, cost-effective metal and steel product solutions. Since the beginning, our goal has been to provide our customers with high-quality products backed by the best service and support in our industry. Our modern 35,000-square-foot facility, located in Houston, TX, enables us to carry an extensive product inventory — and that means fast delivery to your facility. We also have a complete in-house fabrication shop where we can customize any of our stock products to meet virtually any customer requirement.
We invite you to contact our knowledgeable sales staff to learn more about our selection of bar grating clips and fasteners. We can also assist you in selecting the right product for your applications and provide a no-obligation quote. Make Marco Specialty Steel your choice for all your metal product needs!
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