Steel Gratings 1,Type:Plain,Serrated,"I",Press-Locked 2,FB405/30/100, 3,Surface:Untreatment,Galvanized,Painted...... 1. 1).Bearing bar pitches may be 12.5 to 15,20,30,40,60,80,90mm, of which 20,30mm and 40mm are recommended. 2).Cross bar pitch may be 24-200mm, of which 30,38,50,76mm and 100mm are recommended. 4).Materia specification: ASTM A36, BS4360, JIS G3101 & SS400.2. Guide to selection of ...