描述

Professional EN4 Hydraulic Door Closer for Doors up to 85kg

The ZT-A003 Series Door Closer is a professional-grade EN4 hydraulic surface-mounted door closer engineered for medium to heavy-duty applications. Designed with precision hydraulic technology, a high-strength aluminum alloy body, and an adjustable dual-speed control system, the ZT-A003 delivers reliable, quiet, and safe door operation for commercial, institutional, and residential environments.

Designed for doors weighing up to 85kg and with a maximum width of 1200mm, the ZT-A003 provides excellent closing performance, enhanced durability, and long service life. Its robust construction and advanced hydraulic mechanism make it an ideal solution for projects requiring dependable automatic door control under frequent daily use.

Manufactured under strict quality control standards, the ZT-A003 is suitable for OEM and ODM production and is widely exported to Europe, North America, the Middle East, Southeast Asia, Africa, and South America.

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Product Features

High-Strength Aluminum Alloy Body

The ZT-A003 door closer is manufactured using premium die-cast aluminum alloy, providing exceptional strength while maintaining a lightweight structure.

Compared with ordinary materials, aluminum alloy offers:

• Excellent corrosion resistance
• Superior impact resistance
• Stable mechanical performance
• Long service life
• Attractive modern appearance

The housing is finished with a high-quality spray-painted coating, which protects the product against scratches, oxidation, moisture, and daily wear.

Standard finish:

• Silver

OEM customization includes:

• Black
• White
• Gold
• Champagne
• Bronze
• Custom RAL colors

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Precision Hydraulic Control System

The ZT-A003 utilizes an advanced hydraulic oil damping mechanism to provide smooth, controlled, and quiet door closing.

The hydraulic system effectively absorbs closing force, preventing doors from slamming while ensuring user safety.

Advantages include:

• Stable hydraulic pressure
• Leak-resistant oil chamber
• Quiet operation
• Consistent performance
• Long maintenance interval

Each hydraulic chamber is precision-machined to ensure accurate sealing and long-lasting operation.

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Dual-Speed Adjustable Closing

The door closer features independent adjustment valves that allow installers to fine-tune door movement according to project requirements.

Two independent adjustment stages include:

Main Closing Speed

Adjustable from 180° to 15°

This stage controls the majority of the door movement.

Latching Speed

Adjustable from 15° to 0°

The final closing speed ensures the latch engages securely without excessive impact.

This dual-speed system provides:

• Smooth door movement
• Reduced noise
• Increased user comfort
• Improved safety
• Better protection for locks and hinges

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Heavy-Duty Spring System

The internal spring is manufactured using premium alloy spring steel with advanced heat treatment technology.

Features include:

• High elastic recovery
• Stable closing force
• Excellent fatigue resistance
• Long operating life
• Reliable performance under continuous use

The spring structure is specially designed to withstand thousands of opening and closing cycles while maintaining consistent closing performance.

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Excellent Sealing Technology

High-quality sealing components effectively prevent hydraulic oil leakage.

Benefits include:

• Longer product lifespan
• Reduced maintenance costs
• Stable hydraulic pressure
• Reliable operation in various climates

The oil chamber maintains consistent damping characteristics even after extended operation.

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Wide Temperature Performance

The specially formulated hydraulic oil maintains stable viscosity across different environmental temperatures.

Suitable for:

• Cold climates
• Tropical regions
• Coastal environments
• Humid conditions
• Dry climates

Stable hydraulic performance minimizes seasonal fluctuations in closing speed.

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Technical Specifications

Item	Specification
Model	ZT-A003
Product Type	Hydraulic Door Closer
Power Size	EN4
Material	Die-cast Aluminum Alloy
Surface Finish	Spray Painting
Standard Color	Silver
Maximum Door Weight	≤85kg
Maximum Door Width	≤1200mm
Adjustable Closing Speed	Yes
Adjustable Latching Speed	Yes
Maximum Opening Angle	180°
Hold Open Function	90° Hold Open / 180° Non Hold Open
Hole Center Spacing	188 × 19 mm

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Product Advantages

Smooth Automatic Closing

The precision hydraulic system ensures controlled door movement from full opening to complete closing.

Benefits include:

• Prevents door slamming
• Protects door frames
• Reduces operating noise
• Improves building safety

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Easy Installation

The ZT-A003 is designed using standardized mounting dimensions.

Professional installers can complete installation quickly with common tools.

Suitable for:

• Left-hand doors
• Right-hand doors
• Push side installation
• Pull side installation

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Attractive Appearance

The streamlined housing design complements modern architectural styles.

The smooth spray-painted finish enhances both durability and aesthetics.

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Reliable Long-Term Performance

Each product undergoes multiple performance tests before packaging.

The door closer maintains reliable operation under continuous daily use.

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Compatible Door Types

The ZT-A003 is suitable for various door materials, including:

• Aluminum doors
• Wooden doors
• Steel doors
• Hollow metal doors
• Fire-rated doors (where compatible with local regulations)
• PVC doors
• Plastic doors
• Glass-framed doors with appropriate hardware systems

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Application Industries

The ZT-A003 is widely used in commercial, institutional, industrial, and residential buildings.

Typical applications include:

Office Buildings

Automatic door closing improves workplace safety while reducing energy loss.

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Hotels

Suitable for:

• Guest room entrances
• Conference rooms
• Service corridors
• Staff entrances

Quiet closing enhances guest comfort.

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Hospitals

Provides smooth and safe door movement in:

• Patient rooms
• Medical offices
• Treatment areas
• Administrative departments

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Schools and Universities

Ideal for:

• Classrooms
• Libraries
• Laboratories
• Administrative offices

High durability supports heavy daily traffic.

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Shopping Malls

Perfect for:

• Retail stores
• Shopping centers
• Department stores
• Commercial entrances

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Apartment Buildings

Widely installed in:

• Apartment entrances
• Public corridors
• Fire doors
• Utility rooms

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Government Buildings

Suitable for:

• Municipal offices
• Public service centers
• Administrative buildings

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Industrial Facilities

Applicable for:

• Factory offices
• Warehouses
• Workshops
• Logistics centers

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Manufacturing Process

Every ZT-A003 door closer is manufactured through a complete production process including:

• Aluminum alloy die casting
• CNC machining
• Surface polishing
• Spray painting
• Spring assembly
• Hydraulic oil filling
• Seal installation
• Functional testing
• Speed adjustment
• Final inspection
• Secure packaging

Every production stage follows strict quality standards to ensure consistent product performance.

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Quality Control

Quality assurance is an important part of our manufacturing process.

Inspection procedures include:

• Raw material inspection
• Aluminum alloy hardness testing
• CNC dimensional inspection
• Surface finish inspection
• Hydraulic leak testing
• Spring torque testing
• Closing speed calibration
• Opening angle testing
• Continuous cycle life testing
• Final visual inspection
• Packaging verification

Only products that pass all inspections are released for shipment.

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OEM & ODM Services

As a professional door closer manufacturer in China, we provide comprehensive OEM and ODM manufacturing services for international customers.

Customization options include:

• Customer logo engraving
• Private label branding
• Customized body colors
• Custom packaging
• User manual printing
• Barcode labels
• Carton artwork
• Accessory kits
• Mounting templates
• Product specification sheets

We also support new product development based on customer drawings or samples.

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Export Markets

The ZT-A003 Series Door Closer is exported to customers in more than 70 countries and regions, serving distributors, wholesalers, and project contractors worldwide.

Europe

Strong demand comes from:

• Germany
• France
• Italy
• Spain
• Poland
• Netherlands
• Belgium
• Czech Republic
• Romania
• Portugal

European customers focus on product reliability, corrosion resistance, and compliance with commercial building requirements.

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North America

Main export destinations include:

• United States
• Canada
• Mexico

Customers typically purchase for commercial buildings, schools, hospitals, office projects, and residential developments.

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South America

Growing markets include:

• Brazil
• Chile
• Argentina
• Peru
• Colombia
• Ecuador

Demand is increasing due to expanding construction and infrastructure projects.

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Middle East

Popular markets include:

• United Arab Emirates
• Saudi Arabia
• Qatar
• Kuwait
• Oman
• Bahrain

Door closers are widely used in hotels, shopping malls, airports, hospitals, and luxury residential developments where durability and reliable operation are essential.

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Southeast Asia

Regular exports are shipped to:

• Vietnam
• Thailand
• Indonesia
• Malaysia
• Singapore
• Philippines
• Cambodia

These countries continue to experience rapid urbanization and demand for modern architectural hardware.

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Africa

Major export destinations include:

• South Africa
• Egypt
• Kenya
• Nigeria
• Tanzania
• Morocco

Applications include government buildings, schools, hospitals, office buildings, and commercial complexes.

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Oceania

Regular customers come from:

• Australia
• New Zealand

These markets value corrosion-resistant finishes, stable hydraulic performance, and long-term durability.

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Target Customer Groups

The ZT-A003 is designed to meet the needs of a broad range of international buyers and business partners, including:

• Building hardware importers
• Architectural hardware wholesalers
• Door hardware distributors
• Glass hardware suppliers
• Aluminum door and window manufacturers
• Steel door manufacturers
• Fire door producers
• Construction material distributors
• General contractors
• Engineering procurement companies (EPC)
• Real estate developers
• Hotel project suppliers
• Government procurement agencies
• Facility management companies
• Home improvement retail chains
• Online B2B and e-commerce sellers
• OEM brands and private-label companies

These customer groups benefit from the product’s competitive pricing, dependable performance, customization options, and consistent manufacturing quality.

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Why Choose the ZT-A003 Series Door Closer?

The ZT-A003 Series Door Closer is engineered to deliver a balance of strength, reliability, and smooth hydraulic performance for medium to heavy-duty door applications. With its durable die-cast aluminum alloy construction, adjustable dual-speed closing system, leak-resistant hydraulic mechanism, and high-performance spring design, it ensures safe and quiet operation in demanding commercial and residential environments.

Supported by strict quality control, advanced manufacturing processes, flexible OEM/ODM services, and extensive export experience, the ZT-A003 is an excellent choice for importers, distributors, contractors, and project developers seeking a dependable hydraulic door closer with international market appeal. Its robust performance, long service life, and broad application range make it a trusted solution for modern building hardware projects worldwide.