BTA DRILL BRAZED - BTA-SERIES DOUBLE TUBE SYSTEM - OUTER FOUR START THREAD Diameter 1.559 - 2.559 d2 d1 ØD l1 L Dimension Tube Grade Designation D L l1 d1 d2 Outer tube Inner tube Diameter TB103 TB203 TB253 BTA x.xxx DE4-39 1.559 - 1.598 2.89 1.20 1.299 1.417 BTDO039 BTDI029 1.535 BTA x.xxx DE4-39 1.599 - 1.646 2.89 1.20 1.299 1.417 BTDO039 BTDI029 1.535 BTA x.xxx DE4-39 1.646 - 1.693 2.89 1.20 1.299 1.417 BTDO039 BTDI029 1.535 BTA x.xxx DE4-42.5 1.693 - 1.744 2.95 1.20 1.417 1.535 BTDO042.5 BTDI032 1.673 BTA x.xxx DE4-42.5 1.744 - 1.795 2.95 1.20 1.417 1.535 BTDO042.5 BTDI032 1.673 BTA x.xxx DE4-42.5 1.796 - 1.850 2.95 1.20 1.417 1.535 BTDO042.5 BTDI032 1.673 BTA x.xxx DE4-46.5 1.851 - 1.909 3.11 1.36 1.555 1.693 BTDO046.5 BTDI035 1.831 BTA x.xxx DE4-46.5 1.910 - 1.972 3.11 1.36 1.555 1.693 BTDO046.5 BTDI035 1.831 BTA x.xxx DE4-46.5 1.973 - 2.035 3.11 1.36 1.555 1.693 BTDO046.5 BTDI035 1.831 BTA x.xxx DE4-51 2.036 - 2.094 3.23 1.36 1.713 1.850 BTDO051 BTDI039 2.008 BTA x.xxx DE4-51 2.095 - 2.154 3.23 1.36 1.713 1.850 BTDO051 BTDI039 2.008 BTA x.xxx DE4-51 2.154 - 2.213 3.23 1.36 1.713 1.850 BTDO051 BTDI039 2.008 BTA x.xxx DE4-55.5 2.213 - 2.299 3.31 1.36 1.870 2.008 BTDO055.5 BTDI043A 2.185 BTA x.xxx DE4-55.5 2.300 - 2.386 3.31 1.36 1.870 2.008 BTDO055.5 BTDI043A 2.185 BTA x.xxx DE4-55.5 2.386 - 2.472 3.31 1.36 1.870 2.008 BTDO055.5 BTDI043A 2.185 BTA x.xxx DE4-55.5 2.473 - 2.559 3.31 1.36 1.870 2.008 BTDO055.5 BTDI043A 2.185 Operating guidelines on page 714. = on request 636