The drill pipe weighted with recesses under the Elevator and a wedge grip
Given UBT meet the requirements of API specification 7 but have wider range of sizes. On customer's request can be manufactured drill collars other sizes. Threaded connections — clutch, the nipple is performed with the discharge grooves, troughs of the threads are hardened by cold plastic deformation. Thread phosphating.
Description
Specifications
| The outer diameter of drill collars(mm) | The depth of the bore of Elevator(mm) | The length of the bore of Elevator(mm) | Depth of groove wedges(mm) | Length of cutting wedges(mm) |
| ∅101.6 — 117.5 | 5.6 | 406 | 4.8 | 457 |
| ∅120.6 — 142.9 | 6.4 | 406 | 4.8 | 457 |
| ∅146.0 — 168.3 | 7.9 | 406 | 6.4 | 457 |
| ∅171.4 — 219.1 | 9.5 | 406 | 6.4 | 457 |
| ∅>=222.2 | 11.1 | 406 | 6.4 | 457 |