Drill collars are used to provide weight on bit so that drill pipes are kept in tension. Especially drill collars can keep drill bits centralized and hole track by large rigidity

 

1.The drill collars are made of modified AISI 4145H chromium molybdenum alloy steel.

2.Full mechanical and chemical mill test certifications are supplied with all drill collars.

3.These mill test certifications guarantee a hardness range of 285 to 341 BHN and an impact value of 40 ft.-lbs. at room temperature one inch below the surface.

4.All connections are precision-machined to API specifications.