Origin	China
Model Number	NC

Product Description:

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.

Customer Options:

1.  Standard: API 7; SY/T 5144; or Non-Standards. 

2.  Type: Slick Drill Collars.

3.  Material: AISI 4145 H.

4.  Size: OD (3 1/8''---14'') * ID (1 1/4''---3'') * Length (10'---31').

5.  Slip & Elevator Recess

6.  Cold Rolling of Thread Roots

7.  Stress Relief Groove

8.  Hard banding: Iron-Matrix Powder Alloy; ARNCO 100XT; 200XT; 300XT; etc.

9.  Thread Surface Process: Phoscoating or Copperize Process Treatment.

10. Delivery Condition: Forged Bar; Semi-Finished; Finished Drill Collar.