Door Closer for Fireproof Door

Model Number: DC-20 Brand Name: ALLY Key Specifications/Special Features: Available for: Metal, steel and wooden doorsFeatures: Calm and quiet when be usedBody: Adopts quality aluminum alloy one-time extrusion forming, with dense material and high strength, with surface spray coating treatment, with delicate lockPiston: Material is 45#stell, with surface carburization treatment for high strength and wear-resistanceGear shaft: Material is 45#steel, with furnace carburization treatment for high strength and wear-resistance

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

Swing arm: Material is cold-rolled sheet, its main function is to transmit the door pushing force to the piston and to the spring, and the transform the spring force ion door closing force to realized door closing