 Origin |
China |
| Model Number |
3 1/8 |
| Grade |
AISI4145H |
| Length |
9150/9450 |
| Outer Diameter |
3 1/8"-14" |
| Specification |
API standard |
| Usage |
oilfield drilling |
The drill collars are made of 4145H modified chromium-molybdenum alloy steel acc. to API Spec.7 and SY/T5144. All threads can be phosphated, copperised or cold worked. All threads are machined with CNC Lathes-Double-Shouldered and special threads, the max diameter of drill collar is 14 inch.
Main products includes: common drill collars, spiral drill collars, nonmagnetic drill collars.
Besides, elevator and slip recesses can be machined to meet the customers' requirements according to API specification.
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