ANSI/NAAMM (MBG531) and YB/T4001.1-2019 are the most widely used steel grating production standards. The following are the production tolerances of steel gratings.
No more than 10% of grating panel width.
Cross bar shall not vary more than 5mm in either direction from perpendicular alignment with bearing bars and spacing shall not vary more than 6mm in 1.5m length.
Grating longitudinal bow shall not be more than 1/200 of the length
Grating transverse bow shall not be more than 1/100 of the width
Grating length allowable deviation +0, -5 mm, width deviation ±5mm, Diagonal allowable deviation less than 5mm.
