High-quality 304 stainless steel hinges in normal use life of up to 10 to 15 years, daily do a simple maintenance can be further extended:

maintenance frequency: 1~2 times per year. Wipe the dust and sand in the hinge gap with a dry cloth, and then drop 1 to 2 drops of lubricating oil at the rotating shaft (do not use edible oil, it is easy to get ash and deteriorate).

Replacement signal: if there is a switch window stuck, abnormal noise, or found that the hinge screw is loose, metal rust and crack, tighten the screw or replace it in time; High-level residents recommend checking the screw tightness every 5 years to avoid the risk of window sash falling off.