... kinds are OK 4>Strong structur Specifications of round bar grating paint steel grating12 years factoryplain grating ,serrated, ... 1985E) Japan: JJS.2. Bearing bar specification:20*3 to 100*63. Bearing bar pitch:12.5,15,25,30, ... clients requirement and 30,40,60mm are recommended4. Cross bar picth:38,50,76,100mm,also be according to ... treatment: untreated, painting or hot dip galvanizing. flat bar grating