In international steel grating procurement, model codes are often misunderstood, especially when different factories or regional standards use slightly different interpretations. A designation like G325/30/100 steel grating is not just a random combination of numbers—it is a compact engineering expression that defines the key structural geometry of the product.
For engineers and procurement teams, correctly interpreting this code is essential for ensuring accurate quotations and avoiding specification mismatches during fabrication.
What Does G325/30/100 Steel Grating Mean?
The model G325/30/100 steel grating describes three core structural parameters of the grating system:
- G325 → Bearing bar size reference, where 32 indicates the bearing bar height，where 5 represents the thickness of the bearing bar
- 30 → Bearing bar spacing
- 100 → Cross bar spacing system reference
This type of coding is widely used in export quotations to simplify technical communication, but it must be correctly interpreted to avoid engineering errors.
Bearing Bar Height: Structural Load Foundation
Understanding the “32” in G325
The “32” in G325 refers to the bearing bar height, which is a critical factor in determining load-bearing capacity.
Why height matters in engineering design
Bearing bar height directly influences:
- Structural stiffness under load
- Span capability between supports
- Long-term deflection control
A 32 mm-class bearing bar is commonly used in:
- Industrial walkways
- Maintenance platforms
- General steel structure flooring systems
Higher bar height generally provides improved load resistance and stability in industrial environments.
Bearing Bar Thickness: Strength and Durability
The role of the “5” parameter
The second parameter, 5, represents the thickness of the bearing bar.
In G325/30/100 steel grating, this corresponds to a 5.0 mm thickness, which significantly improves structural rigidity and impact resistance.
Engineering performance of 5.0 mm thickness
This thickness level is typically used for:
- Heavy-duty industrial platforms
- Equipment maintenance decks
- High-load walkway systems
Compared to thinner alternatives, 5.0 mm bars provide better fatigue resistance and longer service life under repeated loading conditions.
Bearing Bar Spacing: Load Distribution and Open Area
Understanding the “30” parameter
The third parameter, 30, refers to the spacing between bearing bars (center-to-center distance in millimeters).
In this configuration, the system uses a 30 mm spacing, which affects both structural performance and surface behavior.
Functional advantages of 30 mm spacing
This spacing provides:
- Higher load distribution density
- Improved safety for pedestrian traffic
- Balanced open area for drainage and debris passage
It is widely used in industrial environments where both strength and safety are required simultaneously.
Cross Bar Spacing and Structural Integration
Final parameter interpretation in G325/30/100
In the G325/30/100 steel grating specification, the last parameter 100 refers to the spacing between cross bars (center-to-center distance in millimeters).
Structural function of cross bar spacing
Cross bars play a critical role in:
- Locking bearing bars into position
- Maintaining panel geometry under load
- Preventing lateral deformation
A 100 mm cross bar spacing is commonly used in industrial fabrication standards, providing a balance between structural integrity and manufacturing efficiency.
How to Send a Correct RFQ for Steel Bar Grating
To ensure accurate pricing and fabrication, a complete RFQ for G325/30/100 steel grating should clearly define all structural and application requirements.
Essential RFQ details
A complete quotation request should include:
- Bearing bar height (e.g., 32 mm class)
- Bearing bar thickness (e.g., 5.0 mm)
- Bearing bar spacing (e.g., 30 mm, based on system interpretation)
- Cross bar spacing requirement (e.g., 100 mm)
- Surface treatment (hot-dip galvanized, painted, or untreated)
- Application scenario (walkways, platforms, trench covers, etc.)
- Load requirements (if available)
Common RFQ issues in international sourcing
In practice, many buyers submit incomplete specifications, such as only writing “G325/30/100,” without clarifying structural intent. This often results in:
- Incorrect engineering interpretation
- Pricing inconsistencies between suppliers
- Delays in technical confirmation and production
Clear specification communication significantly improves quotation accuracy and reduces project risk.
Final Engineering Note
Understanding G325/30/100 steel grating requires more than decoding numbers—it requires understanding how each parameter affects real-world structural behavior. In industrial applications, especially in international procurement, precision in specification directly impacts safety, cost efficiency, and long-term performance.
A properly structured RFQ ensures that manufacturers can deliver exactly what the project requires without unnecessary revisions or technical ambiguity.
