Professional security doors Manufacturer
Best and reliable chinese manufacturer of security doors
At Grandsea Windows & Doors, we manufacture and export high-quality steel doors, high-security doors, fire doors, and personnel doors engineered for the U.S. market and worldwide. Our products are built for importers, wholesalers, contractors, and developers seeking durable, reliable, and compliant solutions for residential and commercial projects.
Each door is ready to install, complete with a steel frame, hinges, handles, and advanced locking systems. With 9- or 12-point locking mechanisms, reinforced anti-jimmy bolts, and solid core construction using fiberglass or mineral wool insulation, our heavy-duty steel security doors deliver maximum protection without compromising style. Customizable sizes, finishes, and double-locking options ensure that U.S. buyers receive factory-direct, high-performance doors designed for long-term durability and compliance with international safety standards.
High-strength materials and advanced lock systems are used to effectively prevent illegal intrusion.
Provide a variety of design and color options, which are both safe and can enhance the appearance of the house.
Multi-layer structure design effectively blocks external noise and temperature changes.
Passing strict fire and impact tests to ensure safety in extreme situations.
Advanced intelligent security systems can be integrated to provide all-round protection.
Anti-corrosion materials and processes are used to ensure stable performance in long-term use.
Steel-aluminum composite anti-theft security door
- 3mm thick A3 steel plate on the outside, aluminum alloy frame on the inside
- standard height 2.2m, width 1.0m (customizable)
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Lock system :
Main lock: C-level smart lock core, anti-drilling and anti-pry
Secondary lock: 4 stainless steel anti-theft bolts - National 3C certification Class A (highest level)
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Load-bearing capacity:
up to 80kg for a single sash -
Scope of application:
high-end residences, hotels, office buildings
This steel-aluminum composite anti-theft door is our star product, integrating safety, beauty and practicality. The 3mm thick A3 steel plate provides extremely high anti-theft performance, while the inner aluminum alloy frame ensures the lightness and stability of the door body. The C-level smart lock core and multiple anti-theft bolt system build a solid line of defense for your home.
High-strength stainless steel security door
- Anti-pry edge design
- high-strength stainless steel, filled with high-density polyurethane foam
- height 2.0m-2.4m, width 0.8m-1.2m (customizable)
- Multi-point locking system, up to 5 locking points
- U value as low as 0.8 W/(m²·K)
- can withstand 900J impact force
This high-strength stainless steel security door is a perfect combination of lightweight and high security. It not only provides excellent anti-theft performance, but also has excellent weather resistance and thermal insulation. The multi-point locking system and anti-pry edge design further enhance the security of the door.
Customizable Security Doors Engineered for U.S. Projects
At Grandsea Windows & Doors, we manufacture custom-built steel security doors, high-resistance doors, fire doors, and personnel doors designed for U.S. importers, wholesalers, contractors, and developers. With over 25 years of manufacturing experience, 800+ completed projects, and 2,500+ satisfied clients worldwide, our doors combine advanced engineering, durability, and modern design to meet the demands of large-scale residential and commercial projects.
Tailored Materials and Designs
No two projects are alike, and neither are our doors. Choose from:
- Solid Steel – Maximum durability and protection.
- Rustic Wood with Steel Core – Combines traditional aesthetics with reinforced security.
- Aluminum Alloy Security Doors – Lightweight, modern, and highly durable.
Fully customizable in size, finish, glazing, and hardware, our doors can be tailored for residential complexes, commercial facilities, or large-scale development projects, ensuring both performance and architectural appeal.
Advanced Locking Systems for Maximum Security
A door is only as secure as its lock. Grandsea security doors feature premium multi-point locking systems designed to resist forced entry:
- Hook & Tri-Fold Locks – Excellent sealing and theft protection.
- Roller Latches – Smooth operation with strong door closure.
- Deadbolt & 5-Point Systems – Maximum resistance against burglary attempts.
Each locking system is tested independently for durability and long-term reliability, giving U.S. buyers peace of mind.
Certified Resistance and Performance
Every Grandsea door undergoes strict performance and resistance testing before shipment. Options include:
- Standard Steel Security Doors – Basic protection against forced entry.
- High-Resistance Doors – Engineered to withstand hammers, chisels, and cordless drills.
- Fire-Resistant Doors – Combine burglary protection with fire safety, suitable for commercial and industrial use.
With these options, importers, contractors, and developers can select doors perfectly suited to their project requirements, from basic residential security to advanced commercial protection.
Why U.S. Buyers Trust Grandsea
- 25+ Years of Experience in global door and window manufacturing
- 800+ Projects Completed across residential, commercial, and industrial sectors
- 2,500+ Satisfied Customers worldwide
- Advanced production technology with strict quality control at every stage
- Custom design support for U.S. architectural and project specifications
- Expert consultation on measurements, finishes, locks, and installation
- 10-Year Warranty for lasting performance and reliability
Grandsea delivers factory-direct, high-performance security doors that balance safety, style, and cost-efficiency for large-scale U.S. projects.
Upgrade Your Project Security Today
Investing in Grandsea steel security doors means delivering exceptional protection, aesthetic appeal, and long-term reliability to your clients. Partner with us to provide high-quality doors that exceed U.S. standards and project expectations.
Get Every Answers About security doors
What is a security door?
A security door is a door specially designed to enhance entrance security. It is usually made of steel or other strong materials and equipped with advanced locking systems and anti-pry designs to effectively prevent illegal intrusion.
What types of security doors do we provide?
The types of security doors provided by Grandsea include: steel doors, stainless steel mesh doors, aluminum alloy doors, composite doors, etc. Among them, steel doors are generally considered the safest choice.
How to judge whether a security door is truly safe?
A truly safe security door should comply with relevant safety standards. Our security doors meet many international standards, such as Australia’s AS5039-2023 standard. In addition, the quality of key components such as door materials, locks, hinges, etc. is also higher than that of other peer manufacturers.
What is the price range for security doors?
Security doors vary widely in price, ranging from a few hundred to several thousand dollars. The price depends on factors such as the material, size, and security level of the door. Generally, steel doors and stainless steel mesh doors are more expensive.
What other advantages does security doors have besides security?
Security doors also have the following advantages:
- Improves ventilation and allows fresh air to enter the room
- Saves air conditioning costs
- Prevents insects
- Increases privacy
- Improves the appearance of the house
Do security doors require special maintenance?
Most of Grandsea’s modern security doors are designed to be low-maintenance. We recommend that you still check the locks, hinges and other parts regularly, and clean and oil them in time to maintain the long-term and stable use of the security door.
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