How to open the u lock without a key?

When you can't find the key, you can use a hammer and a hammer to open the lock head of the U-lock, which is the most direct way to unlock. If you think this method is violent, you can use an unlocking tool with the same size as the keyhole, insert the tool into the keyhole and put on a socket wrench, so that you can open the U-lock.

1, copper: this is one of the most widely used materials for door locks, which is characterized by good mechanical properties, convenient processing and bright color. Moreover, the handles and locks made of copper are decorative, and the appearance of the material is flat without air holes and sand holes. Copper also has the function of sterilization, which is not easy to breed bacteria, but it is more expensive.

2, stainless steel: stainless steel door locks are very common, characterized by durability, no discoloration, and strong corrosion resistance. There are two common stainless steel door locks: 200 and 304. 200 stainless steel door lock has low chromium content and is easy to rust, while 304 stainless steel door lock has good stability, is not easy to rust and has high cost performance.

3. space aluminium: Another kind of door lock is made of space aluminium, which is soft and prone to oxidation and blackening. Aerospace aluminum materials are mainly divided into sprayed aluminum and alumina. The former has better wear resistance and corrosion resistance than the latter.

4, zinc alloy: zinc alloy door locks mainly appear in the low-end market, its hardness and rust resistance are relatively poor, easy to break. The advantage is that it is easy to make locks with complex patterns and the price is very cheap, so most of the complex locks on the market are zinc alloys.