... gratings, the bearing bar comes in the form of a plain surface flat bar commonly used for platforms ... , trench gratings and stair treats.Features.1> Bearing bar ... and 30,40,60mm are recommended3> Cross bar pitch:38,50,76,100mm,also be ... America standard can also be fabricatedGrating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, ...