Screwed flange is the same as threaded flange and norms of DIN EN1092-1 BS4504 and ANSI B16.5 both have screwed (threaded) flange type, DIN2565 DIN2566 EN1092-1 type 13 and BS4504 are threaded flange norm, screwed flange pressure PN6 and PN16 are popular using, ANSI B16.5 standard have threaded or screwed flanges class 150 300 600 for popular using.
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