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.
|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|