... Welded Neck Flange, Slip on Flange, Threaded Flange, Socket welding Flange, Blind FlangePressure gradeASTM B16.5, 150LBS, 300LBS, 400LBS ... collar flangePressure Grade,PN2.5 –PN40Standard;BS1560; Welding neck flange, socket welding flange, slip on boss flange, blind flange, ... flange,Pressure Grade150 300 400 600 900 1500 2500StandardBS10; Welding neck flange, plate slip-on flange, screwed boss flange ...