... manufacturer 2.BW,NW,HW,PW,SW,UW,ZW 3.NX,HW,PX,SX, 4. 46,56,66,76,86, ... , core lifter case, Core Barrels, etc.X series casing (Casing Type: NX : O.D.88.9mm HX: O.D.114.30mmPX: O ... important when drilling to greater depths.W series casing (Casing Type: BW : O.D.73.0mm NW: O.D.88. ... heavy torque loads. This is by far the most popular type of casing used in geotechnical applications. DCDMA Casing tube(BW ...