Steel Security Doors

The Ultimate Security Door for Maximum Protection

The Ultimate Security Door for Maximum Protection
The Ultimate Security Door for Maximum Protection

Product Description

Product Parameters

Product Parameters

Standard Size:

2050*960 (Accept Customization)

Door Leaf Thickness:

68mm (can be customized)

Door Leaf:

Standard 0.8/1.0mm (Accept Customization)

Inner Filling:

Fire door core panel/honeycomb paper(Accept Customization)

Lock Set:

High Quality Main Lock+Side Lock+Up-Down Lock

Surface Treatment:

Heat Transfer(Accept Customization)

Open Direction:



Handle;Lock;Hinge;Peephole;Door Bell;Bolts


Fireproof; Burglarproof

Transaction information

Unit of measurement:



payment method:


Trade terms:




General logistics information

type of shipping:


Port of shipment:


Supply capacity:


Packaging method:

1PVC Film+4Conner Protect+White Bubble Bag+Foam Board+Export Carton

Additional information


700,000 pcs/year

HS code:


Level Classification of Door Lock Cylinders


In the market, door lock cylinders are categorized into three levels: A-level, B-level, and Super B-level (also known as C-level). According to the "National Mechanical Lock Standard," door lock cylinders are classified into A and B levels, with the Super B-level being an enhanced version developed by manufacturers.


1. A-level Lock Cylinder

Currently, A-level anti-theft locks mainly come in two key types: single-sided key and cross-shaped key. The internal structure of A-level lock cylinders is simple, with limited variations in the pins and shallow pin slots. The technical opening time for A-level locks is within 1 minute, and the likelihood of key duplication is high. The pin structures can be either single-row pins or cross-shaped pins.


2. B-level Lock Cylinder

B-level lock cylinders use flat keys with dual-row pin slots. The key surface has an additional row of irregular, curving lines compared to A-level keys. There are three main types of B-level lock cylinders: computer double-row cylinders, double-row moon-shaped cylinders, and double-sided blade cylinders. The technical opening time for B-level locks is within 5 minutes, and the likelihood of key duplication is high. With the use of torsion tools, the lock cylinder can be opened within 1 minute.


3. Super B-level Lock Cylinder (C-level)

The key for Super B-level lock cylinders has either internal milling grooves or external milling grooves in a single-sided blade shape. The lock cylinder type is the edge bar cylinder. According to tests conducted by the Ministry of Public Security, it is unable to be technically opened for 270 minutes, with an extremely low likelihood of regional key duplication (one in 16 million). The pin structure consists of dual-row blades and V-shaped edge bar locking. If a torsion tool is used to open the lock cylinder, the internal mechanism is damaged, leading to self-locking and rendering it impossible to open.


4. Security Comparison of the Lock Cylinder Types

In terms of security, the order of the lock cylinder types is as follows: Super B-level > B-level > A-level. A-level lock cylinders have a simple single-sided single-row pin slot design, with lower security and production costs. It is advisable for consumers not to choose this type of lock cylinder. B-level lock cylinders use double-sided dual-row pin slots, offering higher security. They are commonly used in residential anti-theft doors. Super B-level lock cylinders provide the highest level of security, making it difficult even for professional locksmiths to open them. They offer the maximum level of protection for household security. Therefore, it is recommended to use Super B-level lock cylinders for anti-theft doors. For more information please contact USELUCK DOOR.

  • FAQ

    Q1: Are you manufacturer? Where is your factory located?
         A: Yes, we are. We are a professional and one of the largest door manufacturer and supplier in China. we can provide nice goods at competitive price.Our factory is located in Yongkang City, Zhejiang Province , the city of the China Science and Technology Hardware Center.
    Q2: what is the minimum order quantity?
        A: Our min order qty is 100pcs.
    Q3: How long is the delivery time?
        A: It depends, normally, 15-20 working days after received the deposit and all details confirmed.
    Q4: Can we mix the 20ft container?
         A: Yes, if the items are meet our min order qty.
    Q5: How can you guarantee your products' quality?
       A: To control quality, we have four testing procedures: initial inspection, re-inspection, final inspection and sampling inspection.
    Q6: What are the terms of payment in your formal trade?
         A: Usually, T/T 30% deposit to start production, the balance paid before shipping.
    Q7: What preferential terms you could give me if I increase the order’s quantity?
         A: The price will have discount. More QTY, more discount.

  • Useluck Door Accessories

    The Ultimate Security Door for Maximum Protection
    The Ultimate Security Door for Maximum Protection

    Our accessories include: handles, lock cylinders, fillers, hinges, side locks, rubber strips,and door skins.Due to our high daily demand for parts, we invite you to contact us directly for purchasing with highly competitive prices!


The Ultimate Security Door for Maximum Protection





country of origin:

Zhejiang China

Type of supply:

Original Manufacturer,Odm

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Useluck Security Door
Factory: Baiyang Industry Area, Wuyi City, Zhejiang Province,China.
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