Custom Steel Grating Sample: JG505/30/100FG, Plain, HDG, Close End

At NJMM, we regularly produce custom Steel Grating samples to demonstrate our manufacturing capabilities and help clients evaluate product specifications before placing bulk orders. Recently, we manufactured a sample panel with the specification JG505/30/100FG, PLAIN, HDG, CLOSE END — a versatile grating configuration suitable for a wide range of industrial applications.

This article explains what each element of this specification means, the manufacturing process behind it, and why this particular configuration is widely used in industrial walkways, operating platforms, Stair Treads, and drainage covers.

Decoding the Specification: JG505/30/100FG

Steel grating specifications follow a standardized format that communicates critical dimensions and features. Understanding this code helps contractors and distributors verify that a product meets project requirements.

JG – This prefix identifies the product as steel grating (the "JG" designation is commonly used in Chinese manufacturing standards for grating products).

505 – This number indicates the bearing bar dimensions. The first digit(s) represent the bearing bar height, and the last digit represents the thickness. In this case, 50mm height and 5mm thickness. This is a robust bearing bar size, suitable for medium-to-heavy load applications.

30 – This is the bearing bar pitch, meaning the center-to-center distance between adjacent bearing bars is 30mm. A tighter pitch like 30mm provides higher load capacity and a denser walking surface compared to wider pitches.

100 – This is the cross bar pitch, meaning the center-to-center distance between adjacent cross bars is 100mm.

FG – This suffix indicates the surface type. FG stands for "flat grating" or plain surface bearing bars. Unlike serrated (toothed) bearing bars that provide enhanced slip resistance, flat bars offer a smooth, comfortable walking surface that is easier to clean and suitable for applications where slip resistance is less critical or where a smoother finish is preferred.

Additional Specification Details

Beyond the core dimension code, the sample includes two important finishing specifications:

PLAIN – This confirms the bearing bar surface is plain (flat), consistent with the FG designation. The walking surface is smooth and free of serrations.

HDG – This stands for Hot-Dip Galvanized. The entire panel, after fabrication, is immersed in molten zinc to create a metallurgically bonded zinc coating. Hot-dip galvanizing provides excellent corrosion resistance, making the grating suitable for outdoor use, humid environments, and industrial settings where rust prevention is essential. The zinc coating thickness typically meets international standards such as ASTM A123 or GB/T 13912.

CLOSE END – This indicates that the ends of the bearing bars are closed with a banding bar (edge plate). A close-ended panel has a finished edge on all sides, providing a clean appearance, added structural rigidity, and protection for personnel during handling and installation. Close-ended grating is often preferred for platforms where a finished edge is required and where the panel will not be cut on-site.

Why This Configuration Is Widely Used

The combination of 50×5mm bearing bars, 30mm bearing bar pitch, 100mm cross bar pitch, plain surface, hot-dip galvanized finish, and close ends creates a highly versatile grating panel. Here is why it performs well across multiple applications:

1. High Load-Bearing Capacity

The 50mm tall, 5mm thick bearing bars provide substantial load-carrying capability. Combined with a tight 30mm pitch, this grating can support heavy foot traffic, equipment, and concentrated loads. It is suitable for operating platforms and industrial walkways where structural integrity is critical.

2. Smooth, Comfortable Walking Surface

The plain (flat) bearing bar surface offers a comfortable walking experience. Unlike Serrated Grating, which has a textured surface that can be less comfortable for prolonged standing or wheeling equipment, plain grating is easier on footwear and allows for smoother movement of carts and trolleys.

3. Excellent Drainage and Ventilation

The open-grid design, with 30mm bearing bar spacing and 100mm cross bar spacing, provides ample open area for water, oil, and debris to pass through. This prevents accumulation on the walking surface and reduces slip hazards, even with the plain surface.

4. Corrosion Resistance

The hot-dip galvanized finish protects the steel from rust and corrosion, extending the service life of the grating and reducing maintenance costs. This makes it suitable for outdoor installations, chemical plants, and wastewater treatment facilities.

5. Finished, Professional Appearance

The close-end banding provides a clean, finished edge. This is particularly important for visible installations where appearance matters, and it also protects workers from sharp edges during handling.

Applications

This grating configuration—JG505/30/100FG, PLAIN, HDG, CLOSE END—is widely used in:

• Industrial Walkways: Safe, durable pathways in factories, refineries, and processing plants.

• Operating Platforms: Load-bearing surfaces for equipment access and maintenance.

• Stair Treads: Can be fabricated into stair treads with the addition of nosing if required.

• Drainage Covers: Open-grid design allows efficient drainage while supporting foot traffic.

Custom Manufacturing at NJMM

This sample demonstrates NJMM's capability to manufacture grating to precise specifications. We can produce panels in a wide range of bearing bar sizes, pitches, surface types, and finishes. Whether you require a standard configuration or a fully custom design, our engineering team can review your drawings and manufacture accordingly.

Our manufacturing process includes:

• Precision Resistance Welding: For strong, consistent connections.

• Hot-Dip Galvanizing: To international standards for corrosion protection.

• Strict Quality Control: Dimensional checks and coating thickness verification.

Conclusion

The JG505/30/100FG, PLAIN, HDG, CLOSE END grating sample represents a versatile, high-performance solution for industrial walkways, operating platforms, stair treads, and drainage covers. Its combination of strength, drainage efficiency, corrosion resistance, and finished appearance makes it suitable for demanding environments. NJMM is ready to manufacture this and other configurations to your exact requirements. Contact us with your specifications or drawings to request a sample or quotation.