How do you choose good door and window locks?

Look at the material

The lock material on the market is basically divided into stainless steel, copper and zinc alloy. High-strength stainless steel, strong corrosion resistance, no discoloration, is the best lock material; copper is more versatile, mechanical properties are superior, locks are expensive; high-quality zinc alloy is strong and wear-resistant, corrosion-resistant, and easy to form. Mostly used for mid-range locks.

Second, look at the surface treatment

The surface treatment is roughly divided into electroplating, spraying and coloring. A surface treatment forms a dense protective film on the surface of the product to prevent corrosion and rust, and make the product more beautiful and durable. At the same time, it is also a standard for measuring product quality. The quality of the locks is mostly electroplated. The coating is fine and smooth, even and moderate, with bright color, no signs of bubbles, rust and oxidation.

Third, see the implementation standards

Foreign countries have very strict standards for hardware locks, so the quality of imported products is relatively high. At present, the Ministry of Light Industry has used some foreign standards to revise the original GB to the current higher requirements of QB. Branded manufacturers are already implementing the QB standard, and small manufacturers are still implementing the original GB standard. Identify the implementation standards for the product.

You can feel the quality of the lock. Generally speaking, the heavy locks are relatively high in quality; the lock body can not be pointed, and the tip is easy to injure, especially the three positions of the lock handle end, the lock tongue and the lock body; the lock spring is easy to open. High sensitivity and long service life.