Origin	China
Model Number	NC

Product Description:

HWDP is the transition zone between drill collar and drill pipe. It can not only reduce stress-formation in the connection of drill collar and drill pipe, but also reduce the wear on OD.

Customer Options:

1.  Standard: API 7-1; SY/T 5146; or Non-Standards. 

2.  Type: Integral HWDP; Welded HWDP; Spiral HWDP.

3.  Steel Grade: AISI 4145 H; Non-Magnetic.

4.  Size: OD (2 7/8''---6 5/8'') *ID (1 1/2''---4'') * Length (31'---44.3').

5.  Central Upset: One; or Two.

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. Cast Steel Thread Protector.

11. Delivery Condition: Forged Bar; Semi-Finished; Finished HWDP.