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Integral heavy weight drill pipes are manufactured from AISI 4142H-4145H modified drill collar material according to SY/T 5146-1997, Specification: 5"OD*3"ID NC50 3 1/2"OD*2 1/16"ID If you are interested, please don't hesitate to contact me......

The products’ minimal tolerance of wall thickness can be controlled within ±5％，much smaller than general products’ tolerance of ±12％, and the tolerance of outside diameter can be controlled within ± 0.5-0.8%.