Weld Neck Flange 10 Inch Class 300 Posted on February 12, 2017July 1, 2017 Weld Neck Flange 10 Inch Class 300 Weld Neck Flange Class 300 Size NPS : 10″ Size DN : 250 mm. Weight : 42 kg. StudBolt Size : 1″ UNC Or (M27) x 160 Long No. of Bolts : 16 EA. Holes Diamater : 28.575 mm. [wpfilebase tag=file id=2176 /] ansi b16 5 ansi flange dimensions ansi flanges asme b16 5 Class 300 flange dimensions raised face flange Weld Neck Flange Weld Neck Flange Class 300