Technical Features: The Drill Collars are made of AISI 4145 H or 4145 H Modified alloy steel. Bores are trepanned from one direction with no mismatch. All drill collars are heat-treated with hardness within 285 to 341 BHN, which are guaranteed one inch below the surface of the pipe.
When inquiry or order, please specify: - Type (slick or spiral grooved) - Outside and inside diameters and overall length - Connection size and type - API Stress relief groove on pin and box ends - Cast or pressed steel thread protectors - Elevator recess or not - Hard-banding or not - Non-magnetic or
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