2b 1st end thread class 16 1st end thread quantity per inch 1 hole drilled through flats, 7/16in.center of hole to tube seat, w/1/8-27 npt thd npt 2nd end thread series
2a 1st end thread class undercut to 1-1/8 in. dia w/45 deg chamfer on male tube end; 90 deg countersink to 5/16 in. dia on female pipe end; 1-1/16 in. distance across flats w/1-1/2 in. dia of washer face on female pipe end npt 2nd end thread series
