weld neck flange 3 Inch Class 2500 Posted on February 8, 2017July 1, 2017 weld neck flange 3 Inch Class 2500 Weld Neck Flange Class 2500 Size NPS : 3″ Size DN : 80 mm. Weight : 42.8 kg. StudBolt Size : 1+1/4″ UNC Or (M33) x 220 Long No. of Bolts : 8 EA. Holes Diamater : 34.925 mm. [wpfilebase tag=file id=2079 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 2500 flange dimensions raised face flange Weld Neck Flange weld neck flange Class 2500