The specification of plain type and serrated type bearing bar is 20 x 3 to 100 x6;the specification of I-section type is 25 x 5 x 3, 32 x 5 x 3, 38 x 5 x 3, 40x 5 x 3, 50 x 5 x 3, 50 x 7 x 4, 55 x 7 x 4, 60 x 7 x 4, 65 x 7 x 4, 70 x 7 x 4,
75 x 7 x 4, etc. 
 2) Bearing Bar Pitch (center to center):

     12.5, 15, 30, 34, 40, 60mm etc, also be according to client's requirement and 30,40, 60mm are recommended, America standard is available. 
  3) Cross Bar Pitch (center to center):

       38, 50, 76, 1001 101.6mm etc, also be according to client's requirement and 50, 100mm are recommended, America standard is available.
  4) Material: Mild Steel (Low Carbon Steel) or Stainless Steel

   5) Surface Treatment: Untreated, Painting or Hot dip Galvanizing

  6) Steel grating standards:

     A) China: ISO9001

     B) USA: D&B NO. 52-903-8909 

     C) UK: BS4592-1987

     D) Australia: AS1657-1985 

     E) Japan: JJS