Socket Weld Flange, Raised Face, 3/4 in Nominal, 1.09 in ID, 1/2 in Thickness, SCH 40/STD Bore, 2-3/4 in Diameter Bolt Circle, 4 Bolt Holes, 0.62 in Bolt Hole, 3.88 in OD, 150 lb Pressure Class, 1-1/2 in Diameter Hub, 0.62 in Length Through Hub, 316/316L Stainless Steel, Domestic