weld neck flange 3/4 Inch Class 900 Posted on February 11, 2017July 1, 2017 weld neck flange 3/4 Inch Class 900 Weld Neck Flange Class 900 Size NPS : 3/4″ Size DN : 20 mm. Weight : 2.7 kg. StudBolt Size : 3/4″ UNC Or (M20) x 115 Long No. of Bolts : 4 EA. Holes Diamater : 22.225 mm. [wpfilebase tag=file id=2107 /] 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