At present, door lock cylinders on the market are categorized into A-grade, B-grade, and even super B-grade. "Consumers can assess the quality of a lock cylinder by the number of pins it has," experts explain. "Generally, multi-pin locks are more secure than single-pin ones, and multi-pin stealth locks are even better than standard multi-pin models." According to professionals, B-grade lock cores cost significantly more than A-grade ones. As a result, most products available in the market come with A-grade locks. "If your security door uses a lock with just one row of pins, it's likely an A-grade cylinder. If you feel it's not safe enough, consider upgrading to a B-grade or super B-grade lock cylinder to enhance the overall security of your door."
**Material quality is also crucial**
"In addition to the lock core, the material used in the hardware plays a vital role in the lock’s performance," experts say. The materials commonly used for locks include aluminum alloy, stainless steel, and copper. Among these, aluminum alloy is the weakest in terms of strength and durability, while copper offers the best performance but comes at a higher price. "Even among copper locks, there are significant differences in craftsmanship and quality between brands. It can be challenging for average consumers to tell the difference." A salesperson adds that the best way for customers to choose a reliable lock is through comparison. High-end brands usually have finer details, with smoother seams, while cheaper locks may look rough. Additionally, when inserting the key, a high-quality lock should make a crisp sound, whereas a low-end one might feel loose and produce a dull noise when turned.
**Door locks should be replaced every five years**
"Most locks have a long service life, but over time, the internal cylinder can wear out, making it easier for keys with similar teeth to open them," says a local locksmith. "It’s recommended to replace the lock cylinder every five to six years to maintain optimal security."
The editor reminds homeowners that many community security doors and locks are installed by real estate developers, who often use lower-quality locks. "In the same community, the same type of lock is often used across multiple units. This increases the risk of 'key duplication,' where someone might accidentally open the wrong door. Many new residents report finding themselves in the wrong homes due to this issue." The editor advises that if a lock hasn't been replaced in a long time, it could lead to serious safety risks. In some cases, a single key might be able to open several doors, which is why it's essential to ensure the quality of lock components and avoid unnecessary security threats.
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