weld neck flange 1 1/2 Inch Class 400 Posted on February 11, 2017July 1, 2017 weld neck flange 1 1/2 Inch Class 400 Weld Neck Flange Class 400 Size NPS : 1 1/2″ Size DN : 40 mm. Weight : 3.7 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=2148 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 400 flange dimensions raised face flange Weld Neck Flange weld neck flange Class 400