- Made of irregular plain steel grating - Features: 1) Bearing bar specification: 20 x 3 to 65 x 5 2) Bearing bar pitch: 12.5, 15, 30, 40, 60mm, also be according to client's requirement and 30, 40, 60mm are recommended 3) Cross bar pitch: 50mm and 100mm are recommended 4) The maximum length of black panel is 6,100mm 5) Material: mild steel or stainless steel 6) Surface treatment: untreated, painting or hot dip galvanizing 7) steel Grating Standards: a) China: YB/T4001-1998 b) USA: ANSI / NAAMM (MBG531-88) c) UK: BS4592-1987 d) Australia: AS1657-1985