BS 4504 is British flange standard, flange pressure PN6 PN10 PN16 PN25 PN40, flange type slip on plate, bosse, blank flange, threaded flange, welding neck flange. BS4504 flange is similar to DIN Flanges norm. BS4504 flange is popular using in UK, southeast asia countries and south africa, plate flanges also named 10/3 or 16/3
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