Threaded flange is the same to screwed flange and norms of DIN2565 2566, EN1092-1/13 BS4504 code 113 and ANSI B16.5 both have threaded flange type or screwed flange type. DIN EN1092-1 BS4504 norm flanges size for DN15-DN150 PN6 and PN16, ANSI B16.5 ASME B16.5 for class 150 and 300 size NPS 1/2"-24" for popular using. hyupshin flanges co., ltd supply all of threaded and screwed flanges.
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