drill Collar
| Drill Collar Specs | Outside Diameter | Inside Diameter | Length | Chamfering Diameter |
| NC35-47 | Φ120.7 | Φ50.8 | 9.14 | Φ114.7 |
| NC38-50 | Φ127.0 | Φ57.2 | 9.14 | Φ121.0 |
| NC46-62 | Φ158.8 | Φ71.4 | 9.14 | Φ150.0 |
| NC46-65 | Φ165.1 | Φ71.4 | 9.14 | Φ154.8 |
| NC50-70 | Φ177.8 | Φ71.4 | 9.14 | Φ164.7 |
It can be produced according to APi standard,as well sa customer's requirement.It is made of 4145H material,the overall heat treatment and mechanical property meet API Spec7.1 standard. Thread was treated with phosphate with the advantage of perfect anti-sticking nature.
Our factory has the largest drill in n orthern China, joint production line, has been certified by API, equipment including 1250T large flat forging machine, C-120A type friction welding machine, 250KW frequency heat through the furnace, 10m straightening machine, 100T tensile testing machine and a number of CNC lathes, special testing equipment, manufacture of drill pipe to meet the geological, geothermal, wells, oil drilling and other trenchless technology requirements.Welcome to our factory tours.
