weld neck flange 1 Inch Class 1500 Posted on February 10, 2017July 1, 2017 weld neck flange 1 Inch Class 1500 Weld Neck Flange Class 1500 Size NPS : 1″ Size DN : 25 mm. Weight : 4.1 kg. StudBolt Size : 7/8″ UNC Or (M24) x 125 Long No. of Bolts : 4 EA. Holes Diamater : 25.4 mm. [wpfilebase tag=file id=2089 /] 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