Socket weld flange is flange type of ANSI B16.5 norm have class rating 150 300 600 900 1500 2500 facing type raised face RF and ring type joint RTJ, flange size NPS 1/2"-24", steel ASTM A105 A350LF A181 GR60 and more, socket welding flanges are similar to slip on hubbed flanges but difference for the flange center hole, there is a step in the flange center hole for socket weld flange.
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