1, Casing hanger is classified into two kinds,i.e. the threaded(mandrel) and the slipped; slip casing hanger consist of G,W,WD,WE and other types, WD hanger is applicable for connection of casing head and surface casing and keeps the slip closing around the casing fast in use of outer force, W hanger adopts self-weight energized sealing structure and WE & G hanger is manual-energized sealing structure. 2, Company Information: Dongying Xincheng Petroleum Technology Co., Ltd. was established in 2003 and located at the second oilfield of China Shengli Oilfield. We have the specialized technicians, senior engineers and peofessional marking team. The company is committed to develop, manufacture and supply a variety array of oilfield equipments, the main products include : Petroleum equipments & tools such as drilling equipments, production equipment,tubular goods, Wellhead quipments, downhole equipments, well control equipments, cementing tools etc.;Petrochemicals. We have established a complete quality control system, all products& equipments manufactured as per international standard and API standard. production 30 days as per quantity packing: standard payment: tt 30% in advance, 70% before shipment Tianjin port or as per requested