... mandrel with certification, G,W,WD,WE type. Slip Casing Hanger Product SpecificationCasing hanger is classified into two kinds, ... i.e. the threaded (mandrel) and the slipped; slip casing hanger consists of G, W, WD, WE and other ... connection of casing head and surface casing and keeps the slip closing the casing fast in use of outer force, W ...