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Drill Tube - STS System ID Thread
 
High Strength Boring Bar made from heat-treated alloy steel. OD ground to ISO h8 and ID threaded.
 
Drill Tube - STS System Schematic

Drilling Range (mm) Unitac Tube D (mm) d (mm) d1 (mm) d2 (mm) H (mm) S (mm)
15.61-16.70 ST0097 14 9 10.8 12.6 21 8
16.71-17.70 ST0098 15 10 11.8 13.6 21 8
17.71-18.90 ST0099 16 10.5 12.5 14.5 22 8
18.91-20.00 ST0000 17 11.5 13.5 15.5 22 8
20.01-21.80 ST00 18 12 14 16 25 10
21.81-24.10 ST01 20 13 16 18 26 12
24.11-26.40 ST02 22 14 17.5 19.5 26 12
26.41-28.70 ST03 24 15.5 19 21 26 12
28.71-31.00 ST04 26 17 21 23.5 29 16
31.01-33.30 ST05 28 18.5 23 25.5 29 16
33.31-36.20 ST06 30 20 25.5 28 29 16
36.21-39.60 ST07 33 23 27 30 36 20
39.61 - 43.00 ST08 36 25.5 30 33 36 20
43.01 - 47.00 ST09 39 28 33 36 36 20
47.01 - 51.70 ST10 43 31 36 39 36 20
51.71 - 56.20 ST11 47 35 39.5 43 40 24
56.21 - 60.60 ST12 51 39 43.5 47 40 24
60.61 - 65.00 ST13 56 43 47.5 51 40 24
65.00 - 66.99 ST14 56 43 47 52 75 32
67.00 - 72.99 ST15 62 48 53 58 75 32
73.00 - 79.99 ST16 68 53 58 63 75 32
80.00 - 86.99 ST17 75 59 64 70 97 44
87.00 - 99.99 ST18 82 66 71 77 97 44
100.00 - 111.99 ST19 94 78 83 89 97 44
112.00 - 123.99 ST20 106 90 95 101 118 60
124.00 - 135.99 ST21 118 92 107 113 118 60
136.00 - 147.99 ST22 130 104 119 125 118 60
148.00 - 159.99 ST23 142 116 131 137 139 72
160.00 - 171.99 ST24 154 124 143 149 139 72
 
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