Specifications
1.  Door closer
2.  Style: Suitable for all kinds of wooden door
3.  Body: Adopts quality aluminum alloy one-time extrusion forming, with dense material and high strength, with surface spray coating treatment, with delicate lock.
4. Piston: The material is 45#steel, with surface carburization treatment for high strength and wear-resistance. At door opening, the gear shaft drives it to compress the spring and reserve force for door closing. At door closing, under the resistance of hydraulic oil, it slows down the spring extension and realizes speed variation or buffering in other word.
5.. Gear shaft: The material is 45#steel, with surface carburization treatment for high strength and wear-resistance.
6.  Spring: Adopts quality spring steel, with less than 1mm shortening after 300, 000times squeezing. At door opening, the spring is compressed, at door closing, the spring is stretches to produce door closing force to close the door.
7.  Swing arm: The 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 into door closing force to realized door closing.
8.. 500000 times tested without damage. 7 years WARRANTY.
9.  Germany machine oil and sealed rings, keep perfect working in cold temperature.
10. Remark: Provide with high quality & reasonable price

Description:
Door closer has different advanced functions for your reference:
1 Two stages speed controlled range: 180 degree -15 degree, latch speed: 15 degree -0 degree.
2 90 degree hold-open function: Door can keep standstill when door is open at 90 degree
3 Closing&latching continuos adjustment: The fastest closing in 3 seconds from 90 degree slowly door closing above 40 seconds
4 Buffer function: Door closer will create resistance to avoid too much forces, when open the doors and hit the wall by closing quickly&resistance can be adjustable.
5 Delayed closing function: Between 180 degree to 65 degree, present by factory is 20 seconds, which can be reduced to 1 second to facilitate the olds&disabilities.
6 Function of closing forces adjustment forces is decided by different size&weight of door, force adjustable door closer can adjust it to min, forces to reduce and facilitate the olds&disable.