Guide
Steel Grating Standards Guide: NAAMM, ASTM, ISO and Regional Codes
By DONGFU GRATING Engineering Team · Published 2026-07-17 · Updated 2026-07-17
A steel grating order can involve several standards at the same time. NAAMM manuals describe grating types, tolerances, load communication and fabrication practice. ASTM or equivalent material standards identify the bearing-bar material, while ASTM A123, ISO 1461 or GB/T 13912 governs hot-dip galvanizing. Regional access and building rules such as BS 4592, AS 1657 or ADA requirements can control platform geometry and opening size. These documents govern different layers, so they are not interchangeable. Name the applicable standard and edition in the project specification, then require the matching evidence such as mill certificates, dimensional inspection records and coating reports.
Standards by task
| Standard | Main scope | Order evidence |
|---|---|---|
| NAAMM MBG 531–535 | Types, loads, welding, design and practice | Specification and inspection records |
| ASTM A36 / A1011 | Carbon steel material | Mill test certificate |
| ASTM A123 / ISO 1461 | Hot-dip galvanized coating | Coating thickness report |
| BS 4592 / AS 1657 | Industrial access structures | Project-specified fabrication checks |
| ADA 2010 | Accessible-route opening limits | Confirmed opening size and orientation |
Use one standard for each layer
One project can use NAAMM for grating language, an ASTM grade for steel, ISO 1461 for coating and a national code for the supporting access structure.
Put each requirement in the purchase specification instead of asking for blanket compliance to every listed standard.