The primary purpose of a security door is to provide protection against theft, followed by its role in enhancing the aesthetics of your home. When purchasing a security door, it's essential to focus on its anti-theft performance and overall quality. Today, we’ll share some key knowledge about security doors and offer a helpful shopping guide. Let’s dive in.
First, let’s take a look at the appearance and structure of security doors in Japan:
1. **Size and Opening Direction**
Standard household security doors come in four main sizes, represented by four digits indicating the width and height of the doorway. For example, a door opening that is 1 meter wide and 2.1 meters tall would be labeled as 1021. Common sizes include 0920, 0921, 1020, and 1021. The door can open inward or outward, and each direction can further be categorized as left or right-handed.
2. **Surface Quality and Safety**
Qualified security doors are made according to national standards. The steel frame should be at least 2 mm thick, while the front and back panels of the door leaf are typically between 0.8–1 mm. These doors have a reinforced structure with internal supports, offering resistance against forced entry and meeting required security standards.
3. **Hardware Safety**
**Anti-theft Locks**: The lock is the most critical component of a security door. It must be certified by a national authority and include features like anti-drilling, anti-sawing, anti-picking, and anti-impact. There are two types: single-point locks, which lock via the lock itself, and multi-point locks, which use additional mechanisms to create multiple locking points around the frame, increasing security.
The extension length of the bolt (lock tongue) for class A security doors should be at least 14 mm, while class B should be 20 mm or more. The lock body should be made from at least 2 mm thick steel or equivalent material, with welded edges and protective measures like anti-drill plates.
**Hinges**: Hinges connect the door to the frame and support the door’s weight. They should also have anti-theft features. Built-in hinges are suitable for external doors, while external hinges are used for internal doors. The hinge pin diameter should be over 12 mm, and the steel plate should be fully welded.
**Secondly, here are four important factors to consider when buying a security door:**
1. **Certificate of Qualification**
A genuine security door must be tested by an authorized agency and come with a safety technology prevention product permit issued by the local public security department.
2. **Security Level**
Security doors are classified into A, B, and C levels, with C being the most secure, followed by B, and then A. Most doors available in the market are A-level, suitable for general household use.
What defines an A-level security door? It should be fully steel, flat, and enclosed. It should resist abnormal opening for at least 15 minutes using basic tools or power tools, or prevent a 615 cm² hole from being cut through.
3. **Lock Strength**
Quality security doors often feature three or five-point locks. These locks not only secure the door but also engage the top and bottom bars for added stability. Many also have rubber seals to reduce noise when closing.
4. **Workmanship Quality**
Check for welding defects such as gaps or missing welds. Ensure the door fits tightly with the frame, the gap is even, and the door opens smoothly. Also, check that the paint or plating is even and durable.
**Brand Guarantee**: A reputable brand ensures better quality and after-sales service. Always look for the “FAM†logo, company name, and implementation standards when purchasing.
In conclusion, choosing the right security door involves understanding its design, materials, hardware, and certifications. If you're looking to upgrade your home security, this guide should help you make an informed decision. If you have any questions, feel free to leave a comment below. We’ll respond as soon as possible.
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**Tags**: Security Door
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