Steel Grating Specification Guide (ASTM & China Standard)

Understanding steel grating specifications is critical when selecting the correct type for industrial flooring, platforms, trench covers, and heavy-duty applications. Different markets use different naming systems, primarily ASTM standards in the United States and GB standards in China.

This guide explains how American W-series grating corresponds to China G-series specifications and how bearing bar size, spacing, and span affect load capacity.

American Standard vs China Standard Naming

In the U.S. market, steel bar grating is commonly identified using W-series numbers such as 15-W-4 or 19-W-4. In China, similar products are labeled as G25/100 or G30/100 based on bearing bar size and spacing.

• 15-W-4 = G25/100 (25×3 mm, 100 mm spacing)
• 19-W-4 = G30/100 (30×3 mm, 100 mm spacing)
• 30-W-4 = G45/100 (45×4 mm, 100 mm spacing)
• 15-W-2 = G25/50 (25×3 mm, 50 mm spacing)
• 19-W-2 = G30/50 (30×3 mm, 50 mm spacing)

While naming differs, the structural performance is determined by bearing bar thickness, bar depth, spacing, and span.

Load Capacity Reference

Under standard conditions using Q235 or ASTM A36 material, typical load references are:

• 15-W-4 – 4.0 kN/m² (walkways)
• 19-W-4 – 4.5 kN/m² (industrial flooring)
• 25-W-4 – 6.5 kN/m² (heavy walkways)
• 30-W-4 – 8.0 kN/m² (vehicle areas)
• 38-W-4 – 10.0 kN/m² (heavy industry)

Actual load capacity depends on span and installation conditions.

Why Standard Comparison Matters

For international projects, engineers and procurement managers must ensure that U.S. ASTM specifications match Chinese manufacturing standards. A clear cross-reference prevents ordering errors and ensures structural safety compliance.

As an experienced Steel Grating supplier, we manufacture grating panels according to ASTM A36, ASTM A123 galvanizing standards, and Chinese GB standards to support global projects.

Download Full Technical Specification

For a detailed comparison table including span, safe load reference, and application guidance, download our complete Steel Bar Grating Technical Specification document.

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Download Full Steel Grating Technical Specification (ASTM & China Standard)

This document provides structured cross-reference data for engineers, contractors, and international buyers.

Conclusion

Choosing the correct steel grating specification requires understanding both naming systems and structural performance data. Whether your project follows ASTM or China standards, proper specification alignment ensures long-term safety and durability.