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Outer & Inner Tubes - DTS System High Strength Boring Bar made from heat-treated alloy steel. OD ground to ISO h8 and ID threaded to fit double tube system thread.

Square thread with 4 starts. For lead, see ‘S’ in table.

Drilling Range (mm) Unitac Outer Tube D (mm) d (mm) d1 (mm) d2 (mm) H (mm) S (mm) Unitac Inner Tube D (mm) Dy (mm) d (mm) 18.41-20.00 OT00 18 12 14 16 27.5 10 IT00 12 10 9 20.01-21.80 OT01 19.5 14 16 18 30 12 IT01 14 12 11 21.81-24.10 OT02 21.5 15 18 19.5 30 12 IT02 15 13 12 24.11-26.40 OT03 23.5 16 19 21 30 12 IT03 16 14 13 26.41-28.70 OT04 26 18 21 23.5 33 16 IT04 18 16 14 28.71-31.00 OT05 28 20 23 25.5 33 16 IT05 20 18 16 31.01-33.30 OT06 30.5 22 26 28 33 16 IT06 22 20 18 33.31-36.20 OT07 33 24 27 30 40 20 IT07 24 22 20 36.21-39.60 OT08 35.5 26 30 33 40 20 IT08 26 24 22 39.61-43.00 OT09 39 29 33 36 40 20 IT09 29 27 25 43.01-47.00 OT10 42.5 32 36 39 40 20 IT10 32 30 28 47.01-51.70 OT11 46.5 35 40 43 44 24 IT11 35 32 30 51.71-56.20 OT12 51 39 44 47 44 24 IT12 39 36 34 56.21-65.00 OT13 55.5 43 48 51 44 24 IT13 43 40 38 65.00-66.99 OT14 56 43 47 52 75 32 IT14 - 40 38 67.00-72.99 OT15 62 48 53 58 75 32 IT15 - 44 41 73.00-79.99 OT16 68 53 58 63 75 32 IT16 - 48 45 80.00-86.99 OT17 75 59 64 70 97 44 IT17 - 54 50 87.00-99.99 OT18 82 66 71 77 97 44 IT18 - 60 56 100.00-111.99 OT19 94 78 83 89 97 44 IT19 - 70 66 112.00-123.99 OT20 106 90 95 101 118 60 IT20 - 80 76 124.00-135.99 OT21 118 92 107 113 118 60 IT21 - 80 76 136.00-147.99 OT22 130 104 119 125 118 60 IT22 - 95 91 148.00-159.99 OT23 142 116 131 137 139 72 IT23 - 100 96 160.00-171.99 OT24 154 128 143 149 139 72 IT24 - 120 116 172.00-183.99 OT25 166 140 155 161 139 72 IT25 - 130 126

* For ranges 62.00-65.00mm (OT13) the inner tube should be ordered 30mm longer than the outer tube. * For ranges 124.00-183.99mm (OT21-OT25) the inner tube should be ordered 220mm longer than the outer tube. * For ranges 124.00-183.99mm (OT21-OT25) the inner tube should be ordered 220mm longer than the outer tube.

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