Weld Neck Flange 2 1/2 Inch Class 150 Posted on February 12, 2017July 1, 2017 Weld Neck Flange 2 1/2 Inch Class 150 Weld Neck Flange Class 150 Size NPS : 2 1/2″ Size DN : 65 mm. Weight : 3.7 kg. StudBolt Size : 5/8″ UNC Or (M16) x 90 Long No. of Bolts : 4 EA. Holes Diamater : 19.05 mm. [wpfilebase tag=file id=2189 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 150 flange dimensions raised face flange Weld Neck Flange Weld Neck Flange Class 150