Stainless Steel Adjustable Self Closing Spring Door Hinge for Passage Door-DDSS033

Simply put, 304 stainless steel spring hinges are high-end door hinges with a "self-rebounding function," especially suitable for scenarios where "automatic door closing" is needed — such as kitchen sliding doors, bathroom partition doors, cabinet doors, and wardrobe doors. They are not ordinary metal hinges; they have a built-in precise spring mechanism that allows the door to close slowly and automatically after being opened, avoiding a loud bang that can be startling and preventing the door from being blown open by the wind or left ajar. For further information, please contact us.

Product Overview
Product Name	Stainless Steel Adjustable Self Closing Spring Door Hinge for Passage Door
Product Model	DDSS033-4x3x3mm
Size	3.0"x3.0"x3.0mm      4.5"x4.0"x3.0mm 3.5"x3.5"x3.0mm      4.5"x4.5"x3.0mm 4.0"x3.0"x3.0mm      4.5"x4.0"x3.4mm 4.0"x4.0"x3.0mm      4.5"x4.5"x3.4mm
Material	Stainless Steel 201, 304 or 316
Fitting	Flat tip, ball bearing, fix pin, screws
Finish	Satin stainless steel, Polished stainless steel, Polished brass, Chrome-plated(polish chrome plate&satin chrome plate), Antique brass, Antique copper, Matt black,   Physical Vapor Deposition
Color	Silver,Black, Golden, Antique Brass, Antique Copper
Suitable for	Wooden door, Metal door, Steel door , Fire rated door

Packaging & Shipping
MOQ	500 Pieces
Package	One pair/white box or color box or   Blister card in Standard export carton
Sample time	5-7 working days
Production lead time	30-35 days
Shipping Port	Jiangmen , China   / Shenzhen ,   China .

Single Action Spring Door Hinge is a special hinge integrated with a spring mechanism, whose core function is to automatically close the door in one direction through the built-in spring. The explanation is provided from four dimensions: design principle, functional features, application scenarios, and advantages:

1. Design Principle

Unidirectional Spring Mechanism: Unlike traditional hinges, the single action spring door hinge embeds a unidirectional spring within the hinge barrel. When the door is pushed open, the spring is compressed and stores energy; after releasing the door, the spring releases the energy, pushing the door back to the closed position automatically.

Simplified Structure: No additional door closer is required; the hinge itself accomplishes the closing function, saving space and cost.

2. Functional Features

Unidirectional Swing: The door can swing only in one direction (e.g., inward or outward), suitable for scenarios where the opening direction needs to be controlled (such as fire doors and emergency exits).

Adjustable Tension: Some models support spring tension adjustment, allowing users to modify the closing speed and force according to door weight and usage frequency, preventing damage to the door frame or noise.

Durability: Made of corrosion-resistant materials such as stainless steel or brass, these hinges can withstand high-frequency use (e.g., 400-500 openings per day), suitable for commercial locations.

3. Application Scenarios

Commercial Buildings: Entrance doors of restaurants and cafés often use double action hinges for bidirectional passage, but single action hinges are suitable for areas needing controlled traffic direction (e.g., kitchen back doors).

Residential: Entrance doors, bathroom doors, and other doors that require automatic closing, enhancing convenience and safety.

Public Facilities: Places like hospitals and schools where doors must remain closed (e.g., fire doors), complying with fire safety regulations.

4. Core Advantages

Cost Efficiency: The integrated spring design eliminates the cost of additional door closers, simplifies installation, and requires low maintenance.

Space Optimization: No exposed door closer, providing a cleaner door appearance, suitable for environments with high aesthetic requirements.

Safety: Automatic closing prevents the door from remaining open for long periods, reducing safety hazards (such as children entering or fire spreading).

Comparison with Double Action Spring Hinges

Feature	Single Action Spring Hinge	Double Action Spring Hinge
Swing Direction	Unidirectional (e.g., inward only)	Bidirectional (inward/outward)
Applicable Scenarios	Areas requiring controlled direction (e.g., fire doors)	Areas requiring bidirectional passage (e.g., restaurant entrances)
Number of Springs	Single spring	Two independent springs