8W4 Steel Grating Specifications (US & China Standard)
8W4 steel grating is a high-density welded bar grating specification designed for enhanced safety and reduced open area. It is commonly used in industrial walkways, maintenance platforms, and areas requiring improved pedestrian protection.
As a reliable Steel Grating manufacturer, we supply 8W4 grating panels manufactured according to ASTM, NAAMM, and Chinese YB/T standards for global engineering projects.
1. What Does 8W4 Mean?
Under NAAMM Metal Bar Grating standards, 8W4 Steel Bar Grating follows this designation system:
- 8 = 8/16″ (1/2″) bearing bar spacing (12.7 mm)
- W = Welded construction
- 4 = 4″ (101.6 mm) cross bar spacing
- Material: ASTM A36 carbon steel
- Surface: Hot-dip galvanized per ASTM A123 (optional)
With 1/2 inch bearing bar spacing, 8W4 provides tighter openings than standard 19W4 or 30W2, improving safety in pedestrian areas.
2. China Equivalent Specification
The closest Chinese metric equivalent typically corresponds to:
G303/12/100 (approximate equivalent)
- 12–13 mm bearing bar spacing
- 100 mm cross bar spacing
- 3 mm bearing bar thickness (common option)
- Material: Q235 carbon steel
- Standard: YB/T 4001.1 Steel Bar Grating
- Galvanizing: GB/T 13912
Because Chinese standards use metric spacing increments, exact matching should be verified during project engineering approval.
3. Technical Comparison Table
| Specification Item | US 8W4 | China Equivalent |
|---|---|---|
| Bearing Bar Spacing | 1/2″ (12.7 mm) | 12–13 mm |
| Cross Bar Spacing | 4″ (101.6 mm) | 100 mm |
| Manufacturing | Welded | Welded |
| Material Grade | ASTM A36 | Q235 |
4. Applications of 8W4 Steel Grating
- Industrial walkways
- Public access platforms
- Maintenance catwalks
- Pedestrian-sensitive flooring
- Drainage covers requiring reduced open spacing
For enhanced slip resistance in wet or oily environments, consider Serrated Steel Grating options.
Conclusion
8W4 steel grating offers narrow bearing bar spacing for improved pedestrian safety and structural performance. When exporting internationally, confirming spacing units, material grade, and galvanizing standards ensures compliance with project specifications.
