Changsha Tianhe Drilling Tools and Machinery Co.,Ltd.
To survive with high quality,to develop with non-stop innovation,to repute with thoughtful service,to brand with great sincerity
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Product features:
According to different application, different diameters of drill tubes are needed, basically, smaller DTH hammers need smaller DTH drill tubes, vice avers. Usually we are offering 50mm, 60mm, 76mm, 89mm, etc.
Specifications:
| Size | Nominal mass Lb/ft | Calculated weight type | Wall thickness | |||
| in. | mm | lb/ft | kg/m | in. | mm | |
| 2 3/8 | 60.3 | 6.65 | 6.26 | 9.32 | 0.280 | 7.11 |
| 2 7/8 | 73.0 | 10.4 | 9.72 | 14.48 | 0.362 | 9.19 |
| 3 1/2 | 88.9 | 9.50 | 8.81 | 13.12 | 0.254 | 6.45 |
| 3 1/2 | 88.9 | 13.30 | 12.31 | 18.34 | 0.368 | 9.35 |
| 3 1/2 | 88.9 | 15.50 | 14.63 | 21.79 | 0.449 | 11.40 |
| 3 1/2 | 88.9 | 15.50 | 14.63 | 21.79 | 0.449 | 11.40 |
| 4 | 101.6 | 14.00 | 12.93 | 19.26 | 0.330 | 8.38 |
| 4 1/2 | 114.3 | 13.75 | 12.24 | 18.23 | 0.271 | 6.88 |
| 4 1/2 | 114.3 | 16.60 | 14.98 | 22.31 | 0.337 | 8.56 |
| 4 1/2 | 114.3 | 20.00 | 18.69 | 27.84 | 0.430 | 10.92 |
| 5 | 127.0 | 16.25 | 14.87 | 22.15 | 0.296 | 7.52 |
| 5 | 127.0 | 19.50 | 17.93 | 26.71 | 0.362 | 9.19 |
| 5 | 127.0 | 19.50 | 17.93 | 26.71 | 0.362 | 9.19 |
| 5 | 127.0 | 25.60 | 24.03 | 35.79 | 0.500 | 12.70 |
| 5 | 127.0 | 25.60 | 24.03 | 35.79 | 0.500 | 12.70 |
| 5 1/2 | 139.7 | 21.90 | 19.81 | 29.51 | 0.361 | 9.17 |
| 5 1/2 | 139.7 | 24.70 | 22.54 | 33.57 | 0.415 | 10.54 |