Hook blocks are rigidly connected traveling blocks and a hook. During drilling, the hook block is connected to the swivel and to the elevator during the tripping operation. When the drill string is rotated by the rotor during drilling, the hook block receives the torque from the swivel and securely holds the swivel shtrop in the hook mouth. It holds the swivel string during tripping operations, providing easy manipulation in the process of grabbing and releasing the drill pipe stands.
Technical characteristics
| UTBK-5-270 | UTBK-6-320 | UTBK-5-320 | TBK-5-320 | |
| Carrying capacity, t | 270 | 320 | 320 | 320 |
| Number of pulleys, pcs | 5 | 6 | 5 | 5 |
| Outer diameter of pulleys, mm | 1120 | 1120 | 1400 | 1400 |
| Profile of the pulley chute under the drill line diameter, mm | 32 | 32 | 35 | 35 |
| Diameter of the main hook horn shed, mm | 220 | 220 | 220 | 220 |
| Yaw diameter of lateral horns, mm | 120 | 120 | 120 | 120 |
| Damper spring force, kgf: | ||||
| at the start of the move | 3300 | 3300 | 3300 | 3300 |
| at the end of the move | 11200 | 11200 | 11200 | 11200 |
| Overall dimensions, mm: | ||||
| height | 4150 | 4250 | 4430 | 4300 |
| width | 1004 | 1174 | 1190 | |
| weight, kg | 7065 | 7545 | 8000 | 7870 |