Steel collar NC series

Drill collar is an important tool in drilling well process for onshore and offshore oilfield exploration and development. The products conform to API Spec 7 "Regulation for Rotary Rig Equipment" and other related standards, and have obtained the certificate of authority to use API monogram. Company can produce not only drill collar with standard tool joint thread, but also product high pressure drill collars and other special drill collar with special-purpose thread. Technical Features 1. Drill collar made of the high quality alloy steel and treated by seasoning has high strength and long service life. 2. The thread root treated by cold trundle strengthening has big bearing pressure and good anti-fatigue capability. 3. The phosphorized or copper-plated threads are wear-resisting, good sealing property, corrosion proof, strong anti-coherency.