Place of Origin: Sichuan China (Mainland) Brand Name: JL
Drill collar is made from AISI4145H steel acc. to SY/ T5144- 1997 and API Spec. 7.
The 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. MS brand drill collar are manufactured strictly from API Spec. 7 and SY5144 standard.
