metal winding spacer is made up of V-shaped or W-shaped stainless steel belt steel as well as nonmetal stuffing, screw winding, then weld starting and tail ends. Fine compression bounce ability, suitable for the sealing parts that have acute temperature and pressure change, and it is a static sealing part of pipeline, valve, pump, heat exchanger, tower, manhole, handhole as well as other flange connection places. Widely used in petrochemical, machinery, electrical power, metallurgy, shipbuilding, pharmacy, atomic energy, space navigation and other departments.