Product description Closed steel grating is one kind of steel grating with frame, also said with the closed end. That means the length and the width of the steel grating can be produced according to customers' requirement. Such as 1mx1m,1mx2m,1mx3m,2mx3m and so on. Steel bar grating is a good choice for strength, safety, long-term cost and durability. Bar Grating consists of a series of bearing bars, welded (or otherwise joined) at various intervals to perpendicular cross bars to form a load-bearing panel. It is available in a wide selection of panel sizes; bar sizes, and material types. Product specification No. Item Description 1 Bearing Bar 25×3, 25×4, 25×4.5, 25×5, 30×3, 30×4, 30×4.5, 30×5, 32×5, 40×5, 50×5, 65×5, 75×6, 75×10,100x10mm etc;US standard: 1'x3/16', 1 1/4'x3/16', 1 1/2'x3/16',1'x1/4', 1 1/4'x1/4', 1 1/2'x1/4', 1'x1/8', 1 1/4'x1/8', 1 1/2'x1/8' etc. 2 Bearing Bar Pitch 12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 32.5, 34.3, 35, 38.1, 40, 41.25, 60, 80mm etcUS standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc. 3 Twisted Cross Bar Pitch 38.1, 50, 60, 76, 80, 100, 101.6, 120mm, 2' & 4' etc 4 Material Grade ASTM A36, A1011, A569, Q235, S275JR, SS304, Mild steel & Low carbon steel, etc 5 Surface Treatment Black, self colour, hot dip galvanized, painted, spray coating 6 Grating Style Plain / Smooth surface,serrated surface 7 Standard China: YB/T 4001.1-2007, USA: ANSI/NAAMM(MBG531-88),UK: BS4592-1987, Australia: AS1657-1985, Japan:JIS 8 Application -Rotation ways, channels, and platforms for pump rooms and engine rooms in various ships;-Flooring in various bridges such as railway bridge sidewalks, over-bridges across the street;-Platforms for oil extraction sites, car washing sites and air towers;-Fencings for car-parks, buildings and roads; drainage trench covers and drainage pit covers for high strength .