Drill Collar

Drill collars are made of AISI 4145H or 4145H modified alloy steel. Its bores are trepanned from one direction with no mismatch. All drill collars are Q&T overall length.
BOBAN makes slick Drill Collars, spiral Drill Collars & also non-magnetic drill collars. with lengths 10-45 feet and OD 3-1/8" - 11". 

BOBAN can make high torque threads such as Double shoulder NC31,NC38,NC46,NC50 and 5-1/2”FH specified by clients

BOBAN no-magnetic drill collars are made from chrome manganese low carbon austenitic alloy, which has following characteristic:

The chemical composition should be controlled strictly during the refining and forging process.

With excellent lower Magnetic permeability, high strength of mechanical properties and outstanding resistant to stress corrosion cracking and no tendency to galling.