Different hardware has different functions, and the standard of choosing and purchasing is different.
According to the function,the hardware can be divided into general hardware and special hardware .
The general hardware  can be divided into the hinge,decorative handle,decorative lock according to the type of setting up.The special hardware can be divided into the bathroom hardware and the kitchen hardware.
1. The following is the tips for  choosing and purchasing the door hardware accessories
1).Should choose the hinge,fiction stay and lock in good sealing performance.When purchase ,you can slide and open it in several times to feel its flexibility and convenience.
2).Choose the lock in good flexibility.You can open it in several times to check its smoothness,and weather the switch is screwed up to save energy.
3).Choose the decorative door hardware accessories in good performance.When choose and purchase, is mainly to see if there are defects on the appearance, electroplating gloss, and feel smoothly.
2.What requirement for the materials for the aluminum alloy doors and windows accessories.
1).Doors and windows and the accessories:must conform to the designing requirement,and the regulation and the size should conform to the national standard.
2).Floor spring:the surface of it should be in stainless steel or copper.After installation and before the use,should adjust the speed of opening and closing which is convenient to use.
3).Door lock:should be the safety lock which can be double-sided opened.
4).Handle:should choose the one in the stainless steel,aluminum alloy or the copper.
5).Roller:should choose the rigid nylon roller,it is the galvanized steel products in general.
6).Sealing material:should choose the sealing rubber and the waterproof silicon.