Weld Neck Flange 3/4 Inch Class 150 Posted on February 12, 2017July 1, 2017 Weld Neck Flange 3/4 Inch Class 150 Weld Neck Flange Class 150 Size NPS : 3/4″ Size DN : 20 mm. Weight : 0.9 kg. StudBolt Size : 1/2″ UNC Or (M14) x 65 Long No. of Bolts : 4 EA. Holes Diamater : 15.875 mm. [wpfilebase tag=file id=2184 /] 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