... 5-100mm cross bar pitch:24--100mm bearing bar:25*3mm,30*3mm,30*5mm,50*5mm F-plain Flooring ... 90mm,100mm of which 20,30and 40mm are recommended.Cross bar pitches may be 24,30,38,50,76and ... omit-ted in the symbol of the steel grating)P-PaintedU-UntreatedGrating type:flat bar: plain type, plain ... I type, serrated type, serrated I type; cross bar: round type and square twisted type.usage: widely used ...