America United Petroleum

America United Petroleum Corporation

Drill Collars

Drill Collars

AUP Drill Collars are manufactured from 4145H modified quenched and tempered steel. Strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.

DRILL COLLARS are made from 4140/4145 seamless chromemoly alloy trepanned solid bar stock or from seamless mechanical tubing. To ensure optimum strength and ductility, each bar is heat treated to a Brinell Hardness Range of 285/341. Additionally, all bars are impact tested to 40 ft. lbs. Izod Z minimum to ensure hardness at least 1" below the surface.

Each bar is machine straightened to within 1/8" in any 5' length and to 3/16" in total axial length. All threads are precision inspected for manufacturing accuracy. These tests and others ensure that all Hacker Drill Collars meet or exceed API specifications.