weld neck flange 2 1/2 Inch Class 900 Posted on February 11, 2017July 1, 2017 weld neck flange 2 1/2 Inch Class 900 Weld Neck Flange Class 900 Size NPS : 2 1/2″ Size DN : 65 mm. Weight : 16.5 kg. StudBolt Size : 1″ UNC Or (M27) x 160 Long No. of Bolts : 8 EA. Holes Diamater : 28.575 mm. [wpfilebase tag=file id=2112 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 900 flange dimensions raised face flange Weld Neck Flange weld neck flange Class 900