... can be produced by customer’s requirements.Specifications of Steel Grating Standard Size 1)The shape of bearing bar: Plain type (may be omitted ... the symbol of steel grating), Serrated type and I-Shape type 2)Bearing bar pitches can be 12.5, 15, 20, 30 ... , 30.16, 32.5, 34.3, 40, 60mm, of which 30mm & 40mmare recommended. 3 ...