Weld Neck Flange 12 Inch Class 150 Posted on February 12, 2017July 1, 2017 Weld Neck Flange 12 Inch Class 150 Weld Neck Flange Class 150 Size NPS : 12″ Size DN : 300 mm. Weight : 37 kg. StudBolt Size : 7/8″ UNC Or (M24) x 120 Long No. of Bolts : 12 EA. Holes Diamater : 25.4 mm. [wpfilebase tag=file id=2197 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 150 flange dimensions raised face flange Weld Neck Flange Weld Neck Flange Class 150