1. The choice of a well-off family, the needs of a happy family
1. Placement of important documents and valuables. Such as deeds, contracts, birth certificates, academic certificates, real estate certificates, notarial certificates, etc., to avoid being found when needed due to random placement.
2. Place a small amount of emergency or spare cash, commemorative coins, valuable collections or very personal items, stamps, coins, antiques, jewelry, jewelry, gold watches, etc.
3. Place personal items, personal special items, and others should not see items.
4. Place items, medicines, dangerous goods (such as guns) and adult articles that are not suitable for children.
5. The lock-free trend of modern home decoration, social life is becoming more and more frequent, and it is even more necessary in the case of often hired workers from home.
6. It is widely used in business offices, banks, government, public security, hotels, gas stations, jewelry shops, business halls, ATM machines, cash desks, shopping malls, supermarkets ...
2. What is an anti-theft safe?
Anti-theft safes are also one of the products listed in the national mandatory product certification catalog. The state has set strict standards for safes: first, they must pass the 3C certification. At present, only a few companies in China have passed the 3C certification. It is 8-10 mm, and the circumference is not less than 4 mm. Thirdly, the safe must use electric tools to not open a 38 mm opening on the product. Only when these three conditions are met can a real safe be called. It is characterized by small size and convenient transportation. It is usually fixed on the ground or wall. It has good concealment, it is not easy to find, and it is difficult to move. It is very suitable for use in hotels or homes.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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