Reliable API Drill Collars

Drill collars must sustain high torque and the mass of the drillstring at the bottom of the BHA. This is why all of our drill collars are made from Japanese or Chinese quality steel, processed and machined to API Spec 7-1.

Main Specifications

StandardsAPI Spec 7-1, Fearnley Procter NS-1
TypesSlick, spiral
Diameters2-7/8” - 11”
ThreadsAPI connections, plus AOH, DSTH, PAC, and more
Steel gradesAISI 4541HM, Non Mag DNM110
HardbandingArnco, Tuboscope, proprietary