... plate, al-ma alloy plate, copper plate and nickel platecross bar pitches:maybe 24-200mm,of which 50mm,76mm ... (MBG531-88)UK: BS4592-1987Australia: AS1657-1985 Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, 25X3 ... 25X5…..40X6, 40X8, 40X10,….90X6….Pitch of Load bearding flat bars(mm)12.5,15, 20, 30, 30.6, 32 ... .8, 35.3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, 80 ...