1. Designed and manufactured in accordance with API Spec 7-1 standards.
2. The wall thickness of heavy weight drill pipe is between drill pipe and drill collar, its structure is similar to drill pipe. It is made from premium alloyed steel. Its both tool joints and middle upset are welded hardbands.
Size （in） | O.D. （in） | I.D. （in） | Joint O.D. （in） | Join I.D. （in） | Connection | Max.Elevator Diameter（in） | Central Upset Diameter（in） |
3.1/2 | 3.1/2 | 2.1/4 | 4.3/4 （4.7/8.5） | 2.1/4 | NC38 | 3.7/8 | 4 |
2.1/16 | 2.1/16 | ||||||
4 | 4 | 2.1/2 | 5.1/4 | 2.1/2 | NC40 | 4.3/16 | 4.1/2 |
2.9/16 | 2.9/16 | ||||||
4.1/2 | 4.1/2 | 2.11/16 | 6.1/4 | 2.11/16 | NC46 | 4.11/16 | 5 |
2.3/4 | 2.3/4 | ||||||
2.13/16 | 2.13/16 | ||||||
5 | 5 | 3 | 6.5/8 | 3 | NC50 | 5.1/8 | 5.1/2 |
5.1/2 | 5.1/2 | 3.1/4 | 7 （7.1/4,7.1/2） | 3.1/4 | 5.1/2FH | 5.11/16 | 6 |
3.3/8 | 3.3/8 | ||||||
3.7/8 | 3.7/8 | ||||||
4 | 4 | ||||||
6.5/8 | 6.5/8 | 4 | 8 （8.1/4, 8.1/2） | 4 | 6.5/8FH | 6.15/16 | 7.1/8 |
4.1/2 | 4.1/2 | ||||||
5 | 5 |
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