A parliament hinge is a type of hinge that is commonly used for doors and windows. It is named after the British Parliament building, which originally used this type of hinge on its doors. Parliament hinges are similar to butt hinges, but they have an additional feature that allows the door or window to swing clear of the opening, providing greater access and ventilation.

Parliament hinges are typically made of brass or stainless steel and consist of two parts: the hinge plate and the hinge pin. The hinge plate is attached to the door frame or window frame, while the hinge pin is attached to the door or window itself. The hinge pin is longer than the hinge plate, which allows the door or window to swing clear of the opening.

One of the advantages of parliament hinges is that they allow a door or window to be opened fully, providing maximum access and ventilation. They are commonly used in situations where a door or window needs to be opened fully to allow large objects to pass through, or to provide maximum airflow in a room. They are also used in traditional or historic buildings where they can be used to maintain the original character and appearance of the building.

There are several benefits to using a parliament hinge on doors and windows. These include:

1. Full opening:  One of the main advantages of parliament hinges is that they allow a door or window to open fully, providing maximum access and ventilation. This can be particularly useful in situations where large objects need to be moved in and out of a room, or where maximum airflow is required.

2. Clearance:  The design of parliament hinges allows the door or window to swing clear of the opening, providing additional clearance for objects or people passing through the doorway. This can be especially useful in narrow or crowded spaces.

3. Security:  Parliament hinges are typically made of high-quality materials such as brass or stainless steel, which can provide additional security to a door or window. This can be important in commercial or public buildings where security is a concern.

4. Aesthetics: Parliament hinges can be aesthetically pleasing, especially in traditional or historic buildings where they can be used to maintain the original character and appearance of the building. They come in a variety of finishes and styles, making it easy to match the hinge to the overall design of the door or window.

5. Durability:  Parliament hinges are designed to withstand the wear and tear of regular use and are built to last. They are typically made of high-quality materials and are designed to withstand harsh weather conditions, making them ideal for use in outdoor applications.

Overall parliament hinges offer several advantages over other types of hinges, making them a popular choice for doors and windows in a wide range of applications.