Drill Collars are made from modified AISI 4145H chromium molybdenum alloy steel. Drill collar bars are full-length heat treated and water quenched to obtain ASTM A-370 mechanical properties. Full mechanical and chemical Mill Test Certifications are supplied with all drill collars. Mill Test Certifications guarantee a hardness range of 285 to 341 BHN and an impact value of 40 ft.-lbs. at room temperature at one inch below the surface.

To ensure close tolerance bores, all drill collar bars are trepanned then drifted to API specifications. Bar surface finish is “as rolled” which is original mill finish.

CONNECTIONS: All threaded connections are precision machined to API specifications. API relief groove pin and bore back box stress relief are available on request. Thread roots are cold-worked to offer a greater resistance to fatigue. All connections are phosphated to minimize galling during makeup and applied with thread storage compound. Thread protectors are installed to ensure adequate protection during shipment.

SPIRAL DRILL COLLARS: The spiral cut is added to the drill collar to prevent the likelihood of differential wall-sticking by reducing wall contact between the drill collar and the casing wall or the hole. The box end of the spiral collar is unspiraled 79 inches from box shoulder and the pin end is unspiraled 30 inches from the pin shoulder.