weld neck flange 10 Inch Class 400 Posted on February 11, 2017July 1, 2017 weld neck flange 10 Inch Class 400 Weld Neck Flange Class 400 Size NPS : 10″ Size DN : 250 mm. Weight : 57 kg. StudBolt Size : 1 1/8″ UNC Or (M30) x 190 Long No. of Bolts : 16 EA. Holes Diamater : 31.75 mm. [wpfilebase tag=file id=2156 /] 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