As the names suggests, concealed hinges are those that are not visible from outside. These hinges provide the unique combination of function, strength, value, and appearance for installation in windows. Concealed type window hinges have two parts fixed together by slipping one half on the other and then tightening a screw. The radius of the adjustable leaf helps in swinging the window away from the frame.

Materials Used

Hinges are basically made of metal and metal alloys. Some of the common materials used for making concealed hinge include:

• Aluminium
• Stainless Steel
• Brass
• Iron

Physical Specification

There are various physical specifications that needs to be considered while selecting concealed hinge. Some of the factors that should be considered include:

• Length: It refers to the length of the hinge. It may vary for different type of windows.
  
  
• Leaf Thickness: It is the thickness of the leaves of the concealed hinge.
  
  
• Knuckle Length: It refers to the length of the central raised portion of the hinge.
  
  
• Number of Holes: It refers to the number of holes required for screwing the hinge to the window frame.