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Drill tool lifting sub is a special tools for lifting of the drill tools in petroleum, natural gas industry and geologic exploration. Drill tool lifting sub is divided into a or b type structure. The a type has 18 degree shoulder, the b type has 90 degree shoulder. The lifting sub can be selected according to elevator structure. Integral lifting subs are made of high strength alloy steel. All connections are complied with API 7-1.
Technical specifications and parameters
| No. | Nominal size (mm) | I.D.(mm) | End of pin | Lifting end | ||||
| Connection | O.D.(mm) | DF/mm | Tong Space LPB/mm | O.D.(mm) | Tong Space LPB/mm | |||
| 1 | 73 | 31.8 | NC23 | 79.4 | 76.2 | 250 | 111.1 | 100 |
| 2 | 44.5 | NC26 | 88.9 | 82.9 | ||||
| 3 | 89 | 54 | NC31 | 104.8 | 100.4 | 127 | ||
| 4 | 50.8 | NC35 | 120.7 | 114.7 | ||||
| 5 | 68.3 | NC38 | 127 | 121 | ||||
| 6 | 127 | 71.4 | NC44 | 152.4 | 144.5 | 168.3 | ||
| 7 | 158.8 | 149.2 | ||||||
| 8 | 82.6 | NC46 | 158.8 | 150 | ||||
| 9 | 165.1 | 154.8 | ||||||
| 10 | 171.5 | 159.5 | ||||||
| 11 | NC50 | 177.8 | 164.7 | |||||
| 12 | 184.2 | 169.5 | ||||||
| 13 | NC56 | 196.8 | 185.3 | 300 | ||||
| 203.2 | 190.1 | |||||||
| 14 | ||||||||
| 15 | 95.3 | 6 5/8 REG | 209.6 | 195.7 | ||||
| 16 | NC61 | 228.6 | 212.7 | |||||
| 17 | 7 5/8 REG | 241.3 | 223.8 | |||||
| 18 | NC70 | 247.7 | 232.6 | |||||
| 19 | 254 | 237.3 | ||||||
| 20 | NC77 | 279.4 | 260.7 | |||||
