API 7-1 drilling stem tools drill collar
1. Top supplier of API non-magnetic drill collar
2. Non-magnetic or 4145h material
3. Realiable quality with good service
4. Third party inspection could be accepted
Lake’s non-magnetic drill collar is manufactured from integral nonmagnetic alloy steel according to API spec7 and SY/T5144. All thread can be phosphate, copperiest or cold worked. All thread are machined with CNC Lathes-double-shouldered and special thread.