Detailed Product Description drill collar 1)O.D: 2-3/8"-20" 2.Grade:J55 K55 N80 P110 ect 3.Thread :NU EU STC LTC BTC 4.Standard: API 5CT... drill collar Materials of the Non-magnetic drill collars are from chrome manganese, low carbon obtained by combining a proprietary chemical analysis and a rotary hammer process. The material is resistant to stress corrosion cracking, with high machine ability and no tendency to galling. Magnetic permeability (when MPS=1105/4Nm) relative max �¼r:1.010. Magnetic field gradient (hot spots) max: B 0.05micro tesla/100mm. Place of Origin Beijing, China (Mainland) Brand Name MTWK Model Number various Type Drill Collar Machine Type Drilling Tool Certification API Material Chromium Processing Type Forging Use Well Drilling Packaging Details standard export packing or according to seaworthy packing Delivery Time 30 days Supply Ability 100 Piece/Pieces per Month Details: Category Drilling Tool Certifications FOB Price Min Order 1 Piece/Pieces as your order Lead Time Port tianjin Terms L/C,T/T