15-30, 40, 60, 80, 90 mm etc. with 30, 40 mm recommended.
Cross bar centers:
any greater than 30mm is ok. with 50, 100mm recommended.
G - galvanized
P - painted
U - untreated
Example: JA 325/30/100 WFG
Bearing bar centers at 20mm:
This kind of fine mesh steel gratings have strong load ability and also can prevent the access of sundries of 18mm in diameter. This kind of gratings fit for pedestrian deck, walkway and ditch covers which require high security.
Bearing bar centers at 30mm:
This kind of steel grating is the most commonly used in projects with American, Australian, Japan standards are available. This kind of gratings are featured well by heavyduty. Gratings with cross bar centers at 50mm can bear lateral impact well. This kind of steel grating fit for all kind of industrial platforms.