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Description:Carbon steel: The load bearing bars incorporated in WEBGRATE are produced from steel which conforms to the following equivalent standards: AS3679 Grade 250, BS 4360 Grade 43A and ASTM A36. Plain: Its standard form WEBGRATE is supplied with plain load bearing bars and 6mm square twisted cross rods. Serrated: Serrated grating is available with most standard load bearing bars. The serrations are formed by placing a series of notches along the upper edge of the load bar, thus enhancing the non-slip characteristics of the grating. When serrated, it must be nominated (e.g. WA325 series 1 serrated). It should be made of the serrated conversion factors, shown below the load tables, when determining the load bearing and spanning capacity.