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Bar gratingPlatform steel grating: According to the different types of the bar, steel grating is mainly divided into the following three categories, their respective features are as follows: 1.plain style: plain steel grating is the most popular type. It is mainly used for platforms, walkways, drainage pit cover, stair tread etc. 2. serrated style: Its slip resistance is better than the plain style. 3. I-bar: I-bar steel grating with the light weight, more economical and practical features than theplain style.The common specification: 1.The type of steel grating which pitch of bars is 30mm is used most widely for all sectors of industry. It has the greatest resistance to surface impact. 2. The type of steel grating which pitch of bars is 40mm is widely used in the industry field too. For the suitable interval of the bars so it always economical and weight-lightest. 3.The type of steel grating which with pitch of bars is 60mm, cross bars pitch 50mm has been developed specially for mining industry and weight-lightest in all grating. In case of short spans they can meet a variety of uses.Standard of every country: A) China: YB/T4001-1998 B) USA: ANSI/NAAMM (MBG531-88) C) UK: BS4592-1987 D) Australia: AS1657-1985 E) Japan: JJS. Item No. Bearing Bar Pitch Cross Bar Pitch Specification of bearing barwidth × thickness20x325x332x340x320x525x51 30 100 G203/30/100 G253/30/100 G323/30/100 G403/30/100 G205/30/100 G255/30/100 50 G203/30/50 G253/30/50 G323/30/50 G403/30/50 G205/30/50 G255/30/50 2 40 100 G203/40/100 G253/40/100 G323/40/100 G403/40/100 G205/40/100 G255/40/100 50 G203/40/50 G253/40/50 G323/40/50 G403/40/50 G205/40/50 G255/40/50 3 60 50 G253/60/50 G253/60/50 G403/60/50 G205/60/50 G255/60/50 Item No. Bearing Bar Pitch Cross Bar Pitch Specification of bearing barwidth × thickness32×540×545×550×555×560×51 30 100 G325/30/100 G405/30/100 G455/30/100 G505/30/100 G555/30/100 G605/30/100 50 G325/30/50 G405/30/50 G455/30/50 G505/30/50 G555/30/50 G605/30/50 2 40 100 G325/40/100 G405/40/100 G455/40/100 G505/40/100 G555/40/100 G605/40/100 50 G325/40/50 G405/40/50 G455/40/50 G505/40/50 G555/40/50 G605/40/50 3 60 50 G325/60/50 G405/60/50 G455/60/50 G505/60/50 G555/60/50 G605/60/50 You may tell us your standard, or tell us: size of bearing bar: length x width x thicknessbearing bar pitchcross bar pitchcross rod meterthe bearing bar type