BTU type drill head (3 edges) B ra ze d d r i l l h e a d w i t h exte r n a l 4 - s t a r t t h re a d f o r s i n g l e t u b e s y s te m ( STS ) , to ol d ia m ete r ø15.6 - ø 6 5 m m , CI CT = 3 DCONMS H (Wrench size) DC Cutting edge LF OAL P Steel  M Stainless  K Cast iron  N Non-ferrous S Superalloys : First choice Standard products : Second choice H Hard materials  Coated Drill tube Designation DC OAL LF DCONMS H 1132 2122 3132 Designation Dia. (mm) BTU-00971 16.11 16.11  ST0097 14 43 40.3 12.6 - BTU-00971 16.13 16.13  ST0097 14 43 40.3 12.6 - BTU-002 19.26 19.26  ST0000 17 47 44 15.5 18 BTU-002 19.27 19.27  ST0000 17 47 44 15.5 18 BTU-002 19.28 19.28  ST0000 17 47 44 15.5 18 BTU-002 19.3 19.3  ST0000 17 47 44 15.5 18 BTU-011 20.21 20.21  ST00 18 52.5 49.4 16 18 BTU-011 20.28 20.28  ST00 18 52.5 49.4 16 18 BTU-021 22.1 22.1  ST01 20 56 52.8 18 20 BTU-022 23.6 23.6  ST01 20 56 52.6 18 21 BTU-032 25.26 25.26  ST02 22 57.5 54 19.5 24 BTU-032 25.28 25.28  ST02 22 57.5 54 19.5 24 BTU-032 25.66 25.66  ST02 22 57.5 54 19.5 24 BTU-032 25.67 25.67  ST02 22 57.5 54 19.5 24 BTU-032 25.68 25.68  ST02 22 57.5 54 19.5 24 BTU-032 26.4 26.4  ST02 22 57.5 54 19.5 24 䖃: Line up Reference pages: Standard cutting conditions → 20, Drill tube (STS) → 16 Tungaloy 13