weld neck flange 2 1/2 Inch Class 600 Posted on February 11, 2017July 1, 2017 weld neck flange 2 1/2 Inch Class 600 Weld Neck Flange Class 600 Size NPS : 2 1/2″ Size DN : 65 mm. Weight : 8.2 kg. StudBolt Size : 3/4″ UNC Or (M20) x 120 Long No. of Bolts : 8 EA. Holes Diamater : 22.225 mm. [wpfilebase tag=file id=2131 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 600 flange dimensions raised face flange Weld Neck Flange weld neck flange Class 600