only small WN/ hubbed flgs may be machined from bar;
to my memory limited to 4" OD (bar OD);
dicated by ASME piping code B31.3, ASME press vessel code (ASME VIII-1, App 2) and ASTM product spec's for flanges such as A182 + therein referenced ASTM's; see also ASME B16.5.
So, hubbed flgs not to...