11W4 Steel Grating Specifications (US & China Standard)
11W4 steel grating is a welded bar grating specification designed with moderate bearing bar spacing for improved safety and structural balance. It provides a tighter opening than 15W4 and 19W4, making it suitable for industrial platforms and pedestrian walkways requiring enhanced heel safety.
As a professional Steel Grating supplier, we manufacture 11W4 grating panels according to ASTM, NAAMM, and Chinese YB/T standards for international engineering projects.
1. What Does 11W4 Mean?
Under NAAMM Metal Bar Grating standards, 11W4 Steel Bar Grating follows this designation system:
- 11 = 11/16″ (0.6875″) bearing bar spacing (17.46 mm)
- W = Welded construction
- 4 = 4″ (101.6 mm) cross bar spacing
- Material: ASTM A36 carbon steel
- Surface: Plain or hot-dip galvanized per ASTM A123
Compared with 19W4, 11W4 provides smaller open spacing, improving safety in areas with pedestrian traffic.
2. China Equivalent Specification
The closest Chinese metric equivalent typically corresponds to:
G303/20/100 (approximate equivalent)
- 20 mm bearing bar spacing
- 100 mm cross bar spacing
- 3 mm bearing bar thickness (standard option)
- Material: Q235 carbon steel
- Standard: YB/T 4001.1 Steel Bar Grating
- Galvanizing: GB/T 13912
Since China uses metric spacing increments, final selection should be verified according to engineering load requirements.
3. Technical Comparison Table
| Specification Item | US 11W4 | China Equivalent |
|---|---|---|
| Bearing Bar Spacing | 11/16″ (17.46 mm) | 20 mm |
| Cross Bar Spacing | 4″ (101.6 mm) | 100 mm |
| Manufacturing | Welded | Welded |
| Material Grade | ASTM A36 | Q235 |
4. Applications of 11W4 Steel Grating
- Industrial walkways
- Maintenance platforms
- Equipment access flooring
- Areas requiring improved heel protection
- Drainage covers with moderate load capacity
For enhanced slip resistance, serrated options are available under Serrated Steel Grating.
Conclusion
11W4 steel grating offers tighter bearing bar spacing than standard 19W4 while maintaining efficient drainage and structural strength. Confirming material grade and galvanizing standards ensures full compliance in international projects.
