Top Quality 90 180 Degree hold-open Door Closer

FEATURES:

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

2.Piston: The material is 45#steel,with surface carburization treament for high strength and wear－resistance.At door opening, the gear shaft drives it to compress the spring and reserve force for docr closing.At door closing.under the resistance of hydraulic oil ,it slows down the spring extension and realizes speed variation,or bufering in othe word.

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

4.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 ted00r

5.Swing arm: The material is cold－roled sheet.lts main function is to transmit the door pushing force to the piston and to the spring,and then transform the spring force into door closing force to realize door closing.

6. Two stages spe0d controled range :180-15 latching speed :15-0,