1. Material: AISI 4145H Alloy steel, Non magnetic steel, etc.

2. Use: It is mainly used between dill collar and dill pipe to ease transition stress concentration and reduce the rate between contact area and outer wall wear, which can effectively prevent  the pressure sticking.

3. Standard: API Spec 7-1 or SY/T 5146 Standard.

4. Inspection&Test: When producing, traceability are maintained from the receipt of raw material to completion of final products, and serial numbers are die-stamped on each workpiece body. During each manufacturing process, inspection and test are performed.

5. Drill Pipe OD:23/8'', 27/8'', 31/2'', 4'', 41/2'',5'',51/2''

6. Wall Thickness:7.11~12.7mm

7.RSC Type:NC26, NC31, NC38, NC40, NC46, NC50

8. The Length:R1~R3

9. Upset type: IU,EU,IEU

10.Internal Coating:TK34,TC2000,TC3000

11.Hard Banding: Arnco100XT, Arnco300XT

We also could add internal coating and hard banding as your request.