weld neck flange 1 1/2 Inch Class 900 Posted on February 11, 2017July 1, 2017 weld neck flange 1 1/2 Inch Class 900 Weld Neck Flange Class 900 Size NPS : 1 1/2″ Size DN : 40 mm. Weight : 5.9 kg. StudBolt Size : 1″ UNC Or (M27) x 140 Long No. of Bolts : 4 EA. Holes Diamater : 28.575 mm. [wpfilebase tag=file id=2110 /] 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