Casing and Tubing are produced in accordance with API specifications.

①SQUARE KELLY

②HEXAGONAL KELLY

③KELLY COCK

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.

The Heavy Weight Drill Pipe is made from one piece of AISI 4145H solid bar, fully heat-treated, all physical properties confirm with API Spec.7 Latest Editions. The wear-resistance hardbanding is standard on tool joints connections and central upset.

Drill Pipes are strictly fabricated according to API 5D (for pipe body) and SPEC 7 (for tool joint). - Connections are phosphatized or copperized in order to reduce the possibility of connection galling.