1,Body:Adopts quality aluminum alloy  one-time extrusion forming,with dense material and high strength,with surface spray coating treatment,with delicate lock.

2,Piston:The material is 45#stell,with surface carburization treatment for high strength and wear-resistance.

3,Gear shaft:The material is 45#steel,with furface carburization treatment for high strength and wear-resistance.

4,Spring:Adopts quality spring steel,with less than 1mm shortening afer 300,000times squeezing.At door opening,the spring is compressed,at door closing,the spring is streches to produce door closing force to close the door.

5,Swing arm:The matetial is cold-rolled sheet,its main function is to reansmit the door pushing force to the piston and to the spring,and the transform the spring force ino door closing force to realized door closing.

Door Closer DC-05