How to choose the best anti theft door lock

Class A: It is the original unsafe lock cylinder, the key is flat, only a single-sided single-row bullet slot, including some cross keys, such a lock can be opened in about two or three minutes, and the familiar hand will be faster.

Class B: It is a safer level, it is a double-sided double-row bullet slot from the key, and if there are tools, it will take about 10 minutes for a skilled worker to open the door.

Super B level: is the current level of security, from the key is a double-sided double-row bullet slot, and there is a blade or curve next to it, such a lock cylinder to open it takes more than 280 minutes, the general skilled locksmith also has to spend an hour.

Security door level differentiation:

1. Specific thickness: The thickness of the steel plate determines the strength of the impact resistance.

1) The thickness of the cold-rolled steel plate of the door frame: 2 mm for grade A, mm for grade B, mm for grade C, mm for grade D.

2) Thickness of the outer plate of the door leaf: 1 mm for grade A, 1 mm for grade B, mm for grade C, mm for grade D.

3) Thickness of the inner plate of the door leaf: 1 mm for grade A, mm for grade B, mm for grade C, mm for grade D.

2. Than fillers.

1) Grade A doors are filled differently according to different brands, aluminum silicate rock wool (fireproof cotton), aviation honeycomb aluminum, aluminum foil.

Features: Aluminum silicate rock wool has good thermal insulation, fire and sound insulation properties, aluminum foil is light in weight, corrosion resistance, tasteless, and has good thermal conductivity, heat resistance and low temperature resistance.

2) Class B anti-theft door is made of rock wool and polyurethane foam.

Features: Rock wool has a good flame retardant function and is a poor conductor of heat; The polyurethane foam is filled without gaps, and the bond is strong after curing. Shockproof and compressive, no cracking, no corrosion, no falling off after curing, with ultra-low temperature thermal conductivity, heat preservation resistance.

Efficient insulation, sound insulation, waterproof and moisture-proof after curing.

3) Grade C and Grade D filling, the general market is honeycomb paper.

Features: Basically no thermal insulation, fire protection and sound insulation performance.

3. Locks: anti-theft locks are important components for the door, and the performance of anti-theft locks is directly related to the safety of the door. The anti-theft door produced by the regular manufacturer will have a "security level mark" with a Song body gravure in the upper left corner of the door.

1) The anti-theft level of Class A anti-theft door locks is Class B, that is, the advanced protection level.

2) Class B, C and D anti-theft doors, the anti-theft level of the locks is Class A, that is, the ordinary protection level.

1. Look at the lock material.

The lock materials on the market are basically divided into stainless steel, copper, zinc alloy, iron steel and aluminum. Stainless steel has good strength, strong corrosion resistance and unchanged color, which is the best lock-making material; Copper is more versatile, with superior mechanical properties, and the price is more expensive; High-quality zinc alloy is strong and wear-resistant, has very strong corrosion resistance, is easy to form, and is generally used to make mid-range locks. When purchasing, look at the lock material clearly.

2. Look at the surface treatment of the lock.

The surface treatment of the lock is generally electroplating, spraying and coloring, through which the product can form a protective film to prevent corrosion and rust, and at the same time make the product more beautiful and durable, and can directly measure the quality of the product. To see whether the surface of the lock is flat, smooth and of good quality locks, it is generally treated with electroplating, the coating is moderate, very uniform, bright color, and there are no bubbles, rust and oxidation signs.

3. Look at the functional design and key parts of the lock.

There are many types of locks, and what kind of lock to choose depends on where it is used. Big brands with high quality requirements have very detailed product classifications for different functional requirements, such as access locks, bathroom locks, storage room locks, door locks, etc.

4. Look at the implementation standards of locks.

Foreign countries have very strict standards for hardware locks, so the quality of imported products is relatively superior. At present, the Ministry of Light Industry has learned from some foreign standards to revise the original implementation of GB into the current QB with higher requirements. Small manufacturers do not follow the standards in order to save costs, while large brands will implement the standards when producing products.

5. Look at the lock manual and quality inspection report.

It depends on whether there are instructions and installation guidelines, and the effort lies in the details. To see whether the product has passed the test of the relevant national quality inspection department, usually the technical indicators of inferior door locks can not meet the national standards. Then, double-check that the accessories inside the door lock package are complete.