Lap joint flange is flange type of ANSI (ASME) B16.5 flange standard and lap joint flange class for 150 300 600 900 1500 2500 size NPS 1/2"-24", steel for ASTM A105 A350LF A181 GR60, lap joint flange is similar to slip on hubbed flange but different to the center hole of flange's, in the lap joint flange center hole there is a chemfer and facing type usually is flat face.
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