Door Closer
A door closer must match the door's weight, width and operating requirements while providing controlled closing and reliable latching. Different applications also require different functions, from temporary hold-open positioning to anti-slam control and automatic fire door closing.
At Jiangsu Wenzhong Lock Industry Co., Ltd., we manufacture and supply hydraulic door closers for commercial buildings, steel doors, fire doors and other door applications. Our product range covers commercial hold-open door closers, extra heavy-duty models, internal fire door closers, electric door closers, anti-slam models and concealed or surface-mounted commercial configurations.
With different closing force sizes, functional designs and installation options, we offer door closer products for a range of door structures and operating conditions.
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![Commercial Door Closer with Hold Open]()
Commercial Door Closer with Hold OpenA cleaner pushing a cart, furniture being moved, or hot summer days requiring airflow—these are situations where a self-closing door becomes inconvenient. In such cases, a door closer with a...read more -
![Extra Heavy Duty Door Closer]()
Extra Heavy Duty Door CloserA heavy door is 120-200kg. A steel fire door. A 2 meter wide entrance door. These doors have high inertia. When they close, the impact force on the closer is 3-5 times higher than a normal door. A...read more -
![Internal Fire Door Closers]()
Internal Fire Door ClosersThey cannot have a hold open feature. That is the big difference. A fire door must close automatically in a fire. If a closer has a hold open feature, someone might leave the door open. When a...read more -
![Electric Door Closers Commercial]()
Electric Door Closers CommercialThis is not an automatic door opener. You cannot wave your hand and make the door open. This is a regular hydraulic door closer. The "electric" part is not about the closing. It is about the hold...read more -
![Anti Slam Door Closer]()
Anti Slam Door CloserIn a hospital, the bang wakes patients. In a school, it scares children. In a library, it annoys everyone. And over time, the banging loosens the door frame. It cracks the wall. It can even pinch...read more -
![Automatic Door Closers Commercial]()
Automatic Door Closers CommercialA restaurant kitchen door may open and close up to 200 times per day. A hospital door must close slowly to ensure patient safety. A school door needs to close quickly between class changes. A...read more -
![Heavy Duty Door Closer for Steel Doors]()
Heavy Duty Door Closer for Steel DoorsA steel door is heavy. 80-150kg. A steel door has vibration. When you close it, the whole door shakes. A steel door has torsion. The door twists a little as it moves. These three things kill...read more
A door closer must match the door's weight, width and operating requirements while providing controlled closing and reliable latching. Different applications also require different functions, from temporary hold-open positioning to anti-slam control and automatic fire door closing.
At Jiangsu Wenzhong Lock Industry Co., Ltd., we manufacture and supply hydraulic door closers for commercial buildings, steel doors, fire doors and other door applications. Our product range covers commercial hold-open door closers, extra heavy-duty models, internal fire door closers, electric door closers, anti-slam models and concealed or surface-mounted commercial configurations.
With different closing force sizes, functional designs and installation options, we offer door closer products for a range of door structures and operating conditions.
Door Closer Types and Specifications
Our door closer range includes seven product categories, each designed around different door weights, functions and installation requirements.
- Commercial Door Closers with Hold Open: Provide a designated 90° hold-open position for applications requiring temporary access without repeatedly opening and closing the door.
- Extra Heavy-Duty Door Closers: Designed for heavier doors, including demanding warehouse and airport entrance applications.
- Internal Fire Door Closers: Designed for fire doors requiring automatic closing. These models do not include a hold-open function and cannot be converted into hold-open versions.
- Electric Door Closers: Combine hydraulic closing control with an electromagnetic hold-open mechanism.
- Anti-Slam Door Closers: Incorporate a defined deceleration stage to reduce door-closing impact and noise.
- Automatic Commercial Door Closers: Available in surface-mounted and concealed installation configurations, with adjustable closing and latching speeds.
- Heavy-Duty Door Closers for Steel Doors: Feature reinforced steel arms and specified installation hardware for heavier steel door applications.
Door Closer Technical Specifications
| Product Type | Door Weight / Size | Specifications and Performance |
|---|---|---|
| Commercial Door Closer with Hold Open | Size 3: 65–85 kg; Size 4: 85–120 kg | Hold-open position: 90°; accuracy: ±2°; closing time from 90° to 15°: 3–8 seconds adjustable; final 15° latching time: 0.5–1.5 seconds adjustable; temperature range: -40°C to +120°C; 500,000-cycle test |
| Extra Heavy-Duty Door Closer | Size 5: 120–150 kg; Size 6: 150–200 kg | Maximum door width: 1,400 mm; housing thickness: ≥3.5 mm; deceleration starting angle: 20°; final closing force: ≤200 N; wind test: Level 10, 28 m/s; 800,000-cycle certified life test; after 1,000,000 cycles, closing force reduction is less than 12% |
| Internal Fire Door Closer | Size 3: 65–85 kg; Size 4: 85–120 kg | GB 9398; Fire CCC; stated fire test: over 90 minutes at 1,000°C; temperature range: -20°C to +65°C; at -20°C, oil viscosity variation is less than 15%; 1,000,000-cycle test |
| Electric Door Closer | Size 3 and Size 4 | Electromagnetic holding force: 500 N; release time: less than 0.5 seconds; closing time: 3–8 seconds adjustable; latching time: 0.5–1.5 seconds adjustable; power supply: 24V DC, 0.5A, two-wire connection |
| Anti-Slam Door Closer | Size 2: 40–65 kg; Size 3: 65–85 kg | Deceleration range: 60° (90° to 30°); final deceleration stage begins 25° from the door frame; final closing force: ≤150 N; 4.0 mm steel arm plate; not suitable for doors over 85 kg |
| Automatic Commercial Door Closer | Size 3 and Size 4; 65–120 kg | Closing time from 180° to 15°: 2–10 seconds adjustable; final 15° latching time: 0.3–2 seconds adjustable; maximum opening angle: 180°; noise level: ≤45 dB; nylon gear; gear clearance: ≤0.1 mm |
| Heavy-Duty Door Closer for Steel Doors | Size 4: 85–120 kg; Size 5: 120–150 kg | 5.0 mm steel arm plate; M6 high-strength bolts supplied; arm clearance after installation: ≤0.5 mm; piston-to-cylinder clearance: ≤0.02 mm; clearance after 100,000 vibration cycles: 0.8 mm |
Hydraulic Closing Mechanism and Functional Design
Our hydraulic door closers use a spring-and-hydraulic damping mechanism to control door movement.
The main construction includes a rack-and-pinion piston, return spring, check valve, throttling valve, hydraulic oil chamber and connecting arm. When the door opens, the spring is compressed. During closing, the spring releases its stored force while hydraulic oil flows through controlled passages to regulate the closing movement.
Different product configurations provide specific operating functions:
- Hold-open mechanism: Keeps the door at the designated 90° position when temporary open access is required.
- Electromagnetic hold-open mechanism: Uses a 500 N holding force and releases the door in less than 0.5 seconds when holding power is interrupted. An immediate-release configuration is also available.
- Anti-slam deceleration: Provides a defined 60° deceleration range to reduce the impact associated with door closing.
- Reinforced steel-door arm: Uses a 5.0 mm steel arm plate with supplied M6 high-strength bolts for the specified steel-door installation.
These different constructions allow us to supply door closers with functions suited to their intended door applications.
Door Closer Customization and OEM Supply
We support product customization for customers requiring their own branding and packaging.
Our available customization items include:
- Logo customization: Add your company or brand logo to the product.
- Packaging customization: Customize packaging for your branding and distribution requirements.
- Color customization: Adjust product color according to agreed requirements.
- Specification customization: Discuss specification adjustments based on the selected door closer model and application.
We also provide OEM/ODM services. Specific customization arrangements depend on the selected product and confirmed production requirements.
Door Closer Manufacturing and Supply
Jiangsu Wenzhong Lock Industry Co., Ltd. is a lock and door hardware manufacturer based in Danyang, Jiangsu, China. Our manufacturing business covers research and development, production and sales.
Our production operations include:
- Raw material storage and preparation
- Die casting
- Precision machining
- Surface treatment
- Product assembly
- Quality inspection
Our factory is equipped with more than 100 professional production and processing machines, including die-casting machines, CNC machining centers, precision grinding machines, polishing equipment and automatic assembly lines.
We have 51–100 employees and 16 national patents. Our manufacturing experience also covers related door hardware products, including lock bodies, lock cylinders, door handles and door locks.
This product range provides customers with access to multiple related door hardware categories from one manufacturer. Our customer base includes door manufacturers, fire protection engineering contractors and real estate developers.
For purchasing support, we provide product consultation, model selection assistance, quotations and samples. Warranty terms depend on the selected product: the hold-open model specifies a three-year sealing leak warranty, while the extra heavy-duty and steel-door models specify three-year warranties.
Request a Door Closer Quotation
Looking for a door closer manufacturer for wholesale distribution, import or project supply?
Send us your preferred product type, estimated door weight, required functions and expected order quantity. You can also include your logo, packaging or specification requirements if customization is needed.
We will provide relevant product information, model recommendations, sample arrangements and a quotation based on your requirements.
Contact Jiangsu Wenzhong Lock Industry Co., Ltd. to discuss your door closer requirements and bulk orders.
As one of the most experienced door closer manufacturers and suppliers in China, we also support customized service. We warmly welcome you to wholesale bulk cheap door closer in stock here from our factory. If you have any enquiry about pricelist, please feel free to email us.
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