The material of the lock and how to choose the lock from the new standard
October 07 08:59:56, 2025
When purchasing a lock, one of the primary concerns is its durability and resistance to rust or oxidation. This issue is closely related to the materials used and the surface treatment applied. Choosing the right material can significantly affect the performance and lifespan of a lock.
From a durability standpoint, stainless steel is considered the best option, especially for surface applications. The brighter the finish, the better. It offers high strength, excellent corrosion resistance, and maintains its color over time. However, not all stainless steel is the same. There are two main types: ferritic and austenitic. Ferritic stainless steel is magnetic and may rust if exposed to harsh environments, while austenitic stainless steel is non-magnetic and highly resistant to corrosion. A simple way to identify it is by using a magnet—only austenitic stainless steel will not be attracted.
Copper is another widely used material in locks. It has good mechanical properties, excellent corrosion resistance, and is easy to process. Copper locks, especially those with forged handles, have a smooth surface, high density, and no air holes or sand eyes. They are both strong and rust-resistant, making them ideal for plating with finishes like 24K gold or other luxurious coatings, which add elegance and style to any home.
Zinc alloy is often used for locks with complex designs because it's easier to cast into intricate shapes. However, it lacks the strength and rust resistance of other materials. Consumers should be cautious when selecting zinc alloy locks, as they may not last as long as those made from more durable materials.
Steel is known for its high strength and low cost, but it is prone to rust. Therefore, it is typically used for internal structural parts of a lock rather than external decorative components. Aluminum or aluminum alloys are lightweight and easy to form, but their strength is lower compared to other metals, making them less suitable for heavy-duty applications.
Surface treatment plays a crucial role in enhancing the appearance and longevity of a lock. Common methods include electroplating, painting, and chemical oxidation. These treatments create a protective layer that prevents corrosion and improves aesthetics. To evaluate the quality of surface treatment, tests such as thickness measurement, adhesion testing, salt spray testing, and visual inspection are commonly used.
In China, new standards for door locks were introduced in 2000 to improve product quality and align with international practices. These revised standards (QB/T 2473-2000, QB/T 2475-2000, etc.) set higher requirements than the previous ones. For example, A-grade external door locks now meet or exceed British BS5872 standards, while B-grade products are also improved compared to older Chinese standards. These changes help ensure that Chinese locks are more competitive globally and meet the needs of modern consumers.
When choosing a lock, consider several factors before making a purchase. First, think about where the lock will be installed—whether it’s on a front door, hallway, bedroom, bathroom, or passage—and select a product that matches the function. Second, take into account the environment, such as humidity levels, door structure, and whether it's an inner or outer door. Third, ensure the lock complements your home decor. Fourth, consider the needs of family members, especially if there are elderly people or children. Fifth, decide based on your budget, but always prioritize quality and reliability. Finally, choose a reputable dealer to avoid counterfeit or substandard products.
When purchasing, check the packaging and labels for complete information, including the standard, grade, manufacturer details, and production date. Inspect the product's appearance for any signs of damage or poor finish. Test the functionality, ensuring it operates smoothly and reliably. Compare multiple options, especially for two-way locks, and verify the key's design to ensure ease of use and security.
By taking these steps, you can make an informed decision and choose a lock that is both functional and reliable for your home.