welding neck flange 1/2 Inch Class 900 Posted on February 11, 2017July 1, 2017 welding neck flange 1/2 Inch Class 900 Weld Neck Flange Class 900 Size NPS : 1/2″ Size DN : 15 mm. Weight : 2.3 kg. StudBolt Size : 3/4″ UNC Or (M20) x 110 Long No. of Bolts : 4 EA. Holes Diamater : 22.225 mm. [wpfilebase tag=file id=2106 /] 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