weld neck flange 2 1/2 Inch Class 2500 Posted on February 8, 2017July 1, 2017 weld neck flange 2 1/2 Inch Class 2500 Weld Neck Flange Class 2500 Size NPS : 2 1/2″ Size DN : 65 mm. Weight : 24 kg. StudBolt Size : 1 1/8″ UNC Or (M30) x 195 Long No. of Bolts : 8 EA. Holes Diamater : 31.75 mm. [wpfilebase tag=file id=2078 /] 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