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Specification stud bolts tap studs, With gasket api type 6b flange rx gasket stud bolt nuts point height api type 6b flange figure 2.0-1 api type 6bx flange standoff. http://www.awhem.org/PDFs/TR9501A.pdf Dimensions socket weld flanges stud bolts asme b16, Important information. notes: dimensions millimeters . length stud bolt include height chamfers (points).. http://www.wermac.org/flanges/dimensions_socket-weld-flanges_asme-b16-5.html Dimensions blind flanges stud bolts asme b16.5 nps 1/2, Important information. notes: dimensions millimeters . length stud bolt include height chamfers (points).. http://www.wermac.org/flanges/dimensions_blind-flanges_asme-b16-5.html