... 20 ×3mm to 90×7mm3> Bearing bar pitch:12.5,15,25,30,40,60mm etc. also be ... BS4592-1987d) Australia: AS1657-1985Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, 30.16, 32.5, ... x 516001490135015301420129014201320120032 x 519301790162018401710155017101590144040 x 5228021201920218020301830203018901700 floor grating,drain cover,trench grate,plain steel grating,walkway grating. ...