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API pec 7-1 and SY5411 standard high quality non-magnetic drill collar for oilfield
Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. Our company’s drill collar are manufactured strictly from API Spec 7-1 and SY5411 standard.
Parameters
| Grade | Minimum Tensile Strength | |
| psi | Mpa | |
| 1 | 90000 | 621 |
| 2 | 90000 | 621 |
| 3 | 150000 | 793 |



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