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LSCWS LSCWS
TDO-I (D2.56-6.77)
Double Tube Drill System DCONMS DCONWS Outer Tube
with 4-Start Thread L min
max
Connection Outer Tubes d Inner Tube
L min
max
Designation d Range DCONMS DCONWS LSCWS Int Tube d L min L max
TDO-I14 L=(0-3700)MM 2.559-2.637 2.205 2.047 2.953 TDI-N14 1.575 .00 145.669
TDO-I15 L=(0-2950)MM 2.638-2.874 2.441 2.283 2.953 TDI-N15 1.732 .00 116.142
TDO-I16 L=(0-3700)MM 2.874-3.149 2.677 2.480 2.953 TDI-N16 1.890 .00 145.669
TDO-I17 L=(0-3700)MM 3.150-3.425 2.953 2.756 3.819 TDI-N17 2.126 .00 145.669
TDO-I18 L=(0-3700)MM 3.425-3.937 3.228 3.031 3.819 TDI-N18 2.362 .00 145.669 DEEP DRILLING - BTA SYSTEM
TDO-I19 L=(0-3700)MM 3.937-4.409 3.701 3.504 3.819 TDI-N19 2.756 .00 145.669
TDO-I20 L=(0-3700)MM 4.409-4.881 4.173 3.976 4.646 TDI-N20 3.150 .00 145.669
TDO-I21 L=(0-3700)MM 4.882-5.354 4.646 4.449 4.646 TDI-N21 3.150 .00 145.669
TDO-I22 L=(0-3700)MM 5.354-5.826 5.118 4.921 4.646 TDI-N22 3.543 .00 145.669
TDO-I23 L=(0-3700)MM 5.827-6.299 5.591 5.394 5.472 TDI-N23 3.937 .00 145.669
TDO-I24 L=(0-3700)MM 6.299-6.771 6.063 5.866 5.472 TDI-N24 4.724 .00 145.669
• These products are made to order on request • Indicate overall length (L) when ordering • Ordering example: TDO-I18-L1150 (45.275")
• For 65.00-123.99 mm (2.559"-4.881") diameter range, the inner tube should be 190 mm (7.480") longer than the outer tube
• For 124.00-183.99 mm (4.882"-7.243") diameter range, the inner tube should be 220 mm (8.661") longer than the outer tube
For tools, see pages: IDC-EC (305) • IDD-EC (264)

Universal Marking for Deep Drilling Tools
Double Tube
system
1ST : Single-start thread
2ST : Double-start thread
4ST : Four-start thread Tube L

D I 4ST D.425 d39 L1600 METRIC

D I 4ST D1.673 d1.535 L62.992 INCH

I : Inner Thread Tube ØD Thread Pilot Ød
O : Outer Thread
Tube ØD Tube L

DSLT D32 d30 L1630 METRIC
I
DSLT
II D1.260 d1.181 L64.173 INCH

Inner Tube for Thread Pilot Ød
Double tube system
DCONWS
DCONMS d
LSCWS min
L min L max
max

325