... ), loose plate flange(101), loose plate flange(102), loose plate with weld-neck flange (104), blink flange(105) Pressure Grade PN2.5 ... ; BS 4504(PART-1); welding neck flange, hubbed slip-on hubbed threaded, plate flange, loose plate with weld on plate collar flange ... Pressure Grade, PN2.5 âPN40 Standard; BS1560; Welding neck flange, socket welding ...