weld neck flange 1 Inch Class 2500 Posted on February 8, 2017July 1, 2017 weld neck flange 1 Inch Class 2500 Weld Neck Flange Class 2500 Size NPS : 1″ Size DN : 25 mm. Weight : 5.5 kg. StudBolt Size : 7/8″ UNC Or (M24) x 140 Long No. of Bolts : 4 EA. Holes Diamater : 25.4 mm. [wpfilebase tag=file id=2074 /] 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