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According to the different principles of the lock core, anti-theft locks can be divided into pin locks, leaf locks, magnetic locks, smart card door locks, fingerprint locks, etc. Tumbler locks and magnetic locks are more common. Flat locks, cross locks, computer locks, etc. are all tumbler locks; magnetic locks were once more popular, but they are relatively rare after 2010.
1. Material of lock body. This involves a lot of professional knowledge and technology. The mainland products are generally iron, steel, stainless steel, and zinc alloy. Due to the limitation of technology and cost, the lock rod is not hard enough, and it is often easy to be cut by force pliers or hydraulic tongs.
2. The lock cylinder. Most people only look at the shape when buying a lock. But no matter which kind of domestic lock you buy, the lock cylinder is generally made of copper, and the characteristic of copper is soft. You can easily damage the copper lock cylinder with an electric drill or concentrated acid. There are also differences in the types of lock cylinders. The more commonly used lock cylinders are European-style lock cylinders. In addition, there are American threaded lock cylinders and fire-resistant lock cylinders. Both of them are relatively safe. American lock cylinders are used in high-end doors. The lock is of good quality and high security. The fire-resistant lock cylinder is used in fire-resistant door locks, and can withstand a high temperature of 975 degrees for 90 minutes. It is a special door lock cylinder that is enforced by the state.
3. The key. There are many lock keys, cross, round, crescent and so on. Many keys are made of copper or aluminum-iron alloy, which is easy to be copied. The better materials are steel and new electronic keys, which have higher security.
If the key bar is smooth and without teeth, such a lock is a magnetic lock. In fact, the key head is covered with a sleeve. If you remove the sleeve, you can see that there are three to five small dots inlaid on it. The magnetic lock is not reliable. While the cross lock is easy to open. Special tools for opening magnetic locks and cross locks are available on the market. With this tool, a thief can open most of the magnetic locks and cross locks within a minute or two.
Computer compound locks are more reliable. Computer locks are just a professional name, not really using a computer to unlock the lock. There are three to five circular grooves on the computer lock key. These grooves are arranged and combined by the manufacturer using computers, so they are called computer locks.
The computer programs used by different manufacturers are mostly different. The location, size, and depth of the grooves are naturally different, so its mutual opening rate is much lower than that of cross locks and flat locks. Even a master unlocker, it takes about ten minutes to open a computer lock.
There is also a kind of anti-theft door lock that is more reliable, that is, a composite lock. The so-called composite lock refers to the combination of two or more lock cylinders with different principles on the same lock.
The most common composite lock on the market is a combination of a pin lock and a magnetic lock, and professionals call it a magnetic composite lock. To open this kind of lock, you must first destroy the magnetism of the lock before it can be unlocked technically.
But the magnetic composite lock also has a fatal weakness. If the key is improperly stored, hit by gravity or encounter high temperature, it will be demagnetized. Once demagnetized, the lock cannot be opened.