... :30,40,60mm 2>Cross bar pitch;50,100mm 3>Plain,Serrated,I-shape 4>galvanized welded steel grating Features ... , the chemical plant, the refinery, the iron and steel plant, the paper mill, the machine factory, the ... bar pitch12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 34.3, 35, 40,41,60mm. US ... /4" etc.3Cross bar pitch40,45,50,76,100,101.6mm etc4MaterialASTM A36,A1011,A569,Q235,2755Surface treatmentBlack ...