1. How to choose a lock
1. Products with high reputation, stable quality and good after-sales service should be selected.
2. First check whether the packaging and logo of the purchased product are complete (including the product's implementation standards, grades, manufacturing company name, address, production date). The packaging is firm, the contents of the manual are consistent with the product, and the caution is exaggerated and does not match the facts. phenomenon.
3. The appearance of the lock should be clear, the surface is not rough, and it feels comfortable. The lock is opened and rotated flexibly, the locking device should be functional, and the feeling of failure cannot be felt when the hand is felt, and the security performance is good.
4. Observe the quality of each component of the product, including the lock head, lock body, lock tongue, handle and cover plate parts and related accessories. Is the surface color of the plated parts and painted parts bright and uniform, with or without rust and oxidation signs? damaged.
5. The material should be moderate, and the hand should be firm and reliable. Do not use all kinds of locks made of inferior materials with low quality.
6. Check whether the function of the product is reliable and flexible. Two or more products should be selected for comparison check. Especially when purchasing the two-way lock product, all the keys must be used to test the inner and outer locks separately. You should also check the insurance organization of the product. It is recommended to try each lock at least three times.
7. Then check the tooth condition of the key, such as five spoon teeth, each key should have not less than three different key teeth, while the first tooth and the fifth tooth should try not to choose the deepest key tooth, which is good for key insertion. Pulling is not easy to break.

II. Factors to be considered when purchasing
• Consumers should consider the following aspects before purchasing a lock.
1. The location used and its importance.
That is, consider using it on a street front door, hall door, room, bathroom or passageway to select a product that suits the desired function.
2. The environment, conditions and requirements for use.
You should consider the advantages and disadvantages of the use of the environment, such as dry humidity, door structure, thickness, left or right door, inner door or outer door to prevent the wrong product.
3. Consider coordination with the decorative environment.
According to your own preferences, the product should be considered for coordination and matching with its living room.
4. Consider the situation of family members
Consider whether there are elderly people, children or people with disabilities in your home and choose products that are convenient for him or her.
5. Consider economic affordability
In combination with the family's economic situation, the economy can afford to buy high-end products, and the economy is less than ideal, and the products with lower grades can be selected. However, regardless of whether high-grade or low-grade products are selected, it is necessary to consider whether the strength of the production enterprises is strong and whether the quality is stable. It is recommended to choose products with quite well-known companies to avoid causing financial losses and unnecessary troubles and troubles for daily life.
6. Consider the reputation and service level of the dealer
Prevent some dealers from recommending some counterfeit and shoddy goods to consumers in their own interests.

How to identify the lock
1. First look at the lock cylinder: the lock core is the heart of the lock, its quality directly affects the security performance of the lock.
A. Groove type:
Plane marbles in beads, crescent-shaped, YALE S-shaped with closed center slots, cross recesses, flat marbles, common C4
B. Number of marbles: The same groove type of tooth flower, the more the number of marbles, the better the security performance. The different tooth types of the key should be at least three.
C. Material: The best material for the lock core and key material is copper. Some use zinc alloy, aluminum alloy, or even plastic to make the lock core, and use aluminum plate and iron plate as the key to reduce the cost.
D. Accuracy. When the lock cylinder rotates, the clearance is small, the axial movement is small, the key is inserted smoothly, and the rotation is flexible.

2. Look at the lock body. The lock body is the actuator of the lock. Its quality directly affects the service life and strength of the lock.
A. Material, the quality of the tongue material is arranged according to stainless steel, copper, zinc alloy and aluminum alloy. The shell material is generally ordinary steel plate, but also has poor materials such as galvanized plate and oil cylinder plate. The material thickness is very important, good. The lock can reach 2MM, the difference is only 0.8MM.
B. Locking tongue: the material should be good, the size should be large, the extension length should be long enough (to meet the relevant standard requirements), and the panel should be higher or lower than 0.5MM after returning.
C. Overall: There is weight; shaking the lock body, no loose sound; no obvious gap between the cover and the lock case; the lock tongue is smooth and the gear position is clear

3. Look at the superb handle: the quality of the superb handle directly affects the service life of the lock, feel, and beautiful.

A material:
The best material should be stainless steel, especially as a surface material, the more bright it is. It has good strength, strong corrosion resistance and constant color. However, there are many kinds of stainless steel, which can be mainly divided into ferrite and austenite. Ferritic stainless steel has magnetic properties, commonly known as stainless steel. It takes a long time, and the environment is not good. It will also rust. Only austenitic stainless steel will not rust. The identification method is very simple. You can use copper to identify copper. One of the most widely used lock materials, its mechanical properties, corrosion resistance and processing properties are good, and the color is gorgeous, especially the copper forged handles and other lock decorative parts, the surface is flat, the density is good, no pores, sand holes. It is both strong and rust-proof. It can be used for plating various surface treatments such as 24K gold or gold. It is magnificent, noble and generous, adding a lot of color to people's home.
• Zinc alloy materials have much lower strength and rust resistance, but have the advantage of being easy to make parts with complex patterns, especially for pressure casting. The locks of the more complicated patterns seen in the market are likely to be made of zinc alloy, and consumers should carefully identify them.

• Aluminum or aluminum alloy, ordinary aluminum alloy (except aerospace) is soft and light, with low material strength, but easy to form.

• Steel, which has good strength and low cost, but is prone to rust. It is generally used as a structural material for locks and should not be used as an exterior trim.

B. Surface treatment: Surface treatment refers to covering or forming a protective film on the surface of a part by metal electrodeposition (commonly known as electroplating), painting (called spraying), chemical oxidation (coloring) or other processing methods. The film mainly acts as a preservative, and at the same time increases the aesthetics and durability of the product, which is an important factor for directly measuring the quality of the product. Common methods for measuring surface treatment include: thickness measurement of the cover layer, joint force inspection, salt spray and moisture test, and visual inspection. The coating is applied by methods such as film adhesion, hardness, moisture test, and visual inspection. Generally electroplating is: PVD, nickel plating, chrome plating, gold imitation plating, bronze plating, zinc plating, etc. Coating: electrostatic painting, dusting, chemical oxidation: anodizing,

C. Feel. Feel full, open soft, reset powerful. The virtual position should be small.

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