Friction stay is one kind of the hinges,called as friction hinge also.Its main function is support and position,it is very important as for the window and door hardware accessories.Thus,we will learn about the knowledge of the friction stay from the material requirement,selection basis,installation and the common maintenance.
1. The material requirements
The friction stay should be anti-rusty,because rust affects the sliding smoothness,and then the function of the friction stay will be decreased .The 300-series’ stainless steel is with the high corrosion resistance,such as the 304ss,this kind of stainless steel is with the high corrosion  resistance,and high strength.But the stainless steel which brand is beginning as 2,such as the 201,202.although the price is lower,the corrosion resistance is lower than the one in 300 series.
Otherwise,the thickness of the friction stay influence the bearing capacity.And when the window sash is heavy,the thickness of the friction stay over 2.5 is the best choice.
2. Selection basis
The selection basis of the friction stay depends on the size and the weight of the windows.
1).The requirement of the friction stay≥ the weight of the window sash(the weight of the window sash frame+the weight of glass)× safety factor 1.3
2）.The regulation selection of the friction stay’s length:the length is the 2/3 2/3 window width in general.When the window is light,the length can be 1/2.
3).According to the actual situation,please select the friction stay which can satisfy the above requirements.
3.Installation
1).The friction stay is adopt with the M5×8 stainless steel sunk screw or the ST4.2/4.8×12 self tapping screw.
2).According to the actual situation,screws should be used rationally.And if use the screws correctly,the tightness and reliability of the installation can be ensured.
3).The friction stay and the window sash and window frame should be connected.And all the screw holes should be filled with the screw,if one less, will affect the load bearing when sliding brace is used.
4).When the thickness of the aluminum bar is less than 1.4mm,lining steel on bottom pad of aluminum profile if necessary,and then use the screw to fix it.
4.Common maintenance
The friction stay needs the  regular maintenance. Avoid falling  sand, cement lime and other hard debris and too much dust into the bottom slot of sliding brace, which will cause the window switch to be not smooth, and it should be cleaned in time. At the same time, some lubricating oil should be added regularly to the sliding brace.