Classification of Hinges

Standard Hinges: Used for cabinet doors, windows, entry doors, etc. Available in materials such as iron, brass, and stainless steel. A drawback of standard hinges is that they lack the self-closing function of spring hinges; therefore, after installation, various door catches or latches must be added-otherwise, drafts could cause the door panels to swing open.

 

Cup Hinges (Euro Hinges): Also known as spring hinges. Primarily used for connecting furniture door panels; they typically require a panel thickness of 16 to 20 millimeters. Available in materials such as galvanized iron and zinc alloy. Spring hinges feature adjustment screws that allow for precise vertical and horizontal alignment of the door panel's height and depth. A key feature is their adaptability to specific spatial constraints, allowing the cabinet door's opening angle to be customized. In addition to the standard 90-degree angle, corresponding hinges are available for angles such as 127°, 144°, and 165°, ensuring that various cabinet doors can achieve the appropriate range of motion.

 

Hinge Classification (Detailed):

Light-Duty Hinges: The hinge leaves are thinner and narrower than those of standard hinges; primarily suitable for lightweight wooden doors, windows, and general wooden furniture.
Square Hinges: The hinge leaves are wider and thicker than those of standard hinges; primarily used for doors, windows, or furniture of greater weight and size.
T-Hinges: Suitable for wider door panels, such as the main gates of factories or warehouses.
H-Hinges: A type of loose-pin hinge where one of the leaves can be detached. Primarily used for wooden doors or screen doors that require frequent removal.
Spring Hinges: Designed to automatically close the door panel after it has been opened; they typically allow for opening in only one direction. The hinge pin can be removed to facilitate spring adjustment or replacement; commonly used for screen doors. (Automatic door closers are devices that utilize this same self-closing principle.) Single-spring hinges allow for opening in only one direction, whereas double-spring hinges allow for opening in both inward and outward directions; the latter are primarily used for the main entrance doors of public buildings.
Ball-Bearing Hinges (Brass): Each hinge leaf features a single-direction thrust ball bearing embedded within its knuckle. This ensures that the door opens and closes smoothly and effortlessly; primarily used for heavy-duty doors or specialized steel-plate doors with steel frame structures.
Cold Storage Door Hinges: Feature a baked-enamel surface finish. Larger sizes are manufactured from steel plate, while smaller sizes are manufactured from cast iron. Used for cold storage doors or heavier insulated doors.
Slanted-Cam Lift-Off Hinge: This type of hinge utilizes the slanted surface of the hinge leaf in conjunction with the weight of the door sash to enable the door to close automatically. It is primarily suitable for lighter wooden doors or "half-doors" (such as those found in restrooms).
Removable-Pin Hinge: The central pin (pivot) of this hinge can be extracted. Once removed, the door or window sash can be lifted off, facilitating cleaning and maintenance. It is primarily used on wooden doors and windows that require frequent removal.
Fan-Shaped Hinge: When the two leaves of this hinge are stacked, their combined thickness is approximately half that of a standard hinge. It is suitable for various doors and windows that require rotational opening and closing.
Silent Hinge: Also known as a nylon-washer hinge, it ensures silent operation when doors or windows are opened or closed. It is primarily used on the doors and windows of public buildings.
Single-Flag Hinge: Constructed from stainless steel, this hinge is rust-resistant, wear-resistant, and easy to disassemble. It is frequently used on double-glazed windows.
Pivot-Window Hinge: During installation, the two hinge leaves containing the central pins should be mounted on the sides of the window frame, while the two leaves without pins should be mounted on the sides of the window sash. Specifically, the slotted pin-less leaf must be mounted on the slotted side of the window sash to facilitate the installation and removal of the sash. It is used on operable pivot windows in factories, warehouses, residential buildings, public facilities, and similar structures.
Multi-Functional Hinge: This hinge features an automatic closing function when the opening angle is less than 75°; it remains self-stabilized at angles between 75° and 90°; and it automatically locks into position when opened beyond 95°. This hinge can be installed on doors as a direct replacement for standard hinges.
Anti-Theft Hinge: Unlike standard hinges-where the door sash can be removed simply by extracting the central pin-this anti-theft hinge utilizes a self-locking mechanism involving pins and corresponding pinholes on its two leaves. This mechanism prevents the door sash from being lifted off, thereby providing an anti-theft function. It is suitable for use on residential entrance doors.
Double-Axis Hinge: Available in left-handed and right-handed configurations, this hinge allows the door sash to be freely opened, closed, and removed. It is suitable for use on standard door and window sashes.

 

The Differences Between Hinge Types (Deep Crank, Medium Crank, and Straight)
Full Overlay (Straight Crank): The door panel completely covers the cabinet side panel, leaving a small gap between the two to ensure the door opens smoothly. Half Overlay (Medium Crank): In this scenario, two adjacent doors share a single cabinet side panel. A minimum clearance is required between them. Consequently, the overlay distance of each door is reduced, necessitating the use of a hinge with a bent arm. Inset (Deep Crank): In this case, the door sits *inside* the cabinet frame, positioned alongside the cabinet side panel. A clearance gap is still required to allow the door to open smoothly. This configuration requires a hinge with a significantly bent arm. Simply put: "Full Overlay" (also known as "Straight Arm") means the cabinet side panel is invisible when the door is closed; "Half Overlay" (also known as "Medium Crank") is typically used for double-door cabinets where the doors open outward from the center, leaving half of the side panel visible when closed; and "Inset" (also known as "Deep Crank" or "Non-Overlay") means the cabinet side panel remains fully visible when the door is closed.