• Concealed Appearance: When the uPVC door or window is closed, a butt hinge is designed to be largely concealed within the gap between the sash and the frame. Only the central knuckle (the part with the pin) is typically visible from the edge. This provides a cleaner, more streamlined aesthetic compared to flap/flag hinges which sit on the face of the profile.

• Installation: One leaf of the hinge is attached to the edge of the uPVC sash, and the other leaf is attached to the corresponding edge of the uPVC frame. This often involves specific screw-in fixings designed for uPVC profiles.

• Adjustability: Many modern uPVC butt hinges offer a degree of adjustability, allowing for fine-tuning of the door’s or window’s position (vertical, horizontal, and sometimes compression) to ensure proper alignment, smooth operation, and a tight seal. This adjustability is often achieved via eccentric cams or grub screws.

Key Characteristics and Benefits of uPVC Butt Hinges:

• Aesthetics: Their concealed nature when the door/window is closed makes them a popular choice for those seeking a minimalist or traditional look.

• Durability and Load-Bearing: uPVC butt hinges are designed to be robust and capable of supporting the weight of heavy uPVC sashes, especially those with double or triple glazing.

• Smooth Operation: They facilitate smooth swinging action for opening and closing.

• Security: While less visible, they are integral to the door’s security by ensuring the sash remains firmly attached to the frame.

• Versatility: They are suitable for various uPVC door types (e.g., entrance doors, French doors) and often casement windows.

• Types within Butt Hinges: You might encounter variations like “flat plate” or “angled plate” butt hinges, referring to the design of the leaves to accommodate different uPVC profile shapes. Some are also referred to as “Pencil hinges,” “Cylinder hinges,” or “Edge hinges.