weld neck flange 16 Inch Class 1500 Posted on February 10, 2017July 1, 2017 weld neck flange 16 Inch Class 1500 Weld Neck Flange Class 1500 Size NPS : 16″ Size DN : 400 mm. Weight : 568 kg. StudBolt Size : 2 1/2″ UNC Or (M64) x 445 Long No. of Bolts : 16 EA. Holes Diamater : 66.675 mm. [wpfilebase tag=file id=2102 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 1500 flange dimensions raised face flange Weld Neck Flange weld neck flange Class 1500