Drill Pipe Inc. manufactures Drill Collars from 4140 Q&T and/or 4145 Q&T Alloy. Each Drill Collar is Integral Design, No Mid-Welds. Threaded in Precision CNC Lathes. Our Drill Collars deliver the performance and reliability you can count on.
Break-Out Flats can be added to your Drill Collars, and Float Bores are an option we can provide.