Double-sided Hinges are the most commonly used type of hinge for doors, cabinets, and gates. They are called “double-sided” hinges because their two rectangular metal hinge plates are installed “on opposite sides” (i.e., recessed or set back) along the edges of the door panel and door frame; thus, when the door is closed, only the central hinge pin (hinge head) is visible.

Key Features:

· Two hinge plates: Flat, rectangular metal plates with screw holes; one is mounted on the door, and the other on the door frame.

· Interlocking hinge points: Cylindrical segments are alternately arranged on the hinge plates; when aligned, they are connected by removable or fixed pins.

· Flush mounting: The hinge plates are embedded in shallow grooves, allowing the hinge to sit flush with the wood surface and creating a clean, nearly invisible appearance.

· Pivot point: The pins act as pivots, enabling the door to swing open and closed.

Common Types and Variants:

· Sliding hinges: Simple metal-to-metal contact; the most basic and economical option.

· Ball-bearing hinges: Small ball bearings are installed between the hinge pins to reduce friction—ideal for heavy-duty doors or doors with high-frequency use.

· Spring-loaded hinges: Built-in springs allow the door to close automatically.

· Up-and-over hinges: Feature a spiral (tilted) pivot point design; when opened, the door leaf tilts slightly upward, helping to clear thick carpets and allowing the door to close automatically under gravity.

· Removable pins: Pins are removable, allowing the door leaf to be removed without unscrewing the hinge.

· Fixed pins: The pins are permanently fixed and are commonly used on exterior doors to enhance security.

Typical applications:

· Interior and exterior residential doors

· Cabinet doors and furniture

· Fence gates and shed doors

Due to their simple construction, high strength, and ease of concealment, double-action hinges are the preferred choice in both the construction and woodworking industries.