1.Grating Types:

      W--welded steel grating   L-- pressure-locked   C-- socket-welding

2.Bearing bar Pitches:

      15-30, 40, 60, 80, 90 mm etc. with 30, 40 mm recommended.

3.Cross bar Pitches:

      50, 100mm are recommended.

4.Surface treatment: 

      G - galvanized(EN/BS, ASTM-123,GB)

      P - painted

      U - untreated

5.Grating standard:

        China:   YB/T4001.1-2007(YB/T4001.1-1998)

        Britain:   BS4592-1:1995

        US:      ANSI/NAAMM(MBG531-93)

        Austrilia:  AS1657-1992

6.Marks:

        Example: G 325/30/100    G255/40/50