At present, door lock cylinders on the market are categorized into A-grade, B-grade, and super B-grade models. According to experts, consumers can assess the quality of a lock cylinder by the number of pins inside. Generally, multi-row pin locks offer better security than single-row ones, while multi-row stealth pin locks provide even higher protection. Experts explain that B-grade lock cores are significantly more expensive than A-grade ones, which is why most products available in the market come with A-grade locks. "If your security door has a single-row pin lock, it's likely an A-grade cylinder. If you feel it’s not secure enough, consider upgrading to a B or super B-grade cylinder to enhance the overall anti-theft performance of your door," they advised.
Material quality also plays a crucial role in determining the reliability of a door lock. Experts told us that common materials 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, though at a higher cost. “Even among copper locks, there are significant differences in craftsmanship and quality between brands,†said a salesperson. “It’s difficult for average consumers to tell the difference.†The only way for buyers to ensure they're getting a reliable product is through comparison. High-end brands usually have finer details, with smoother seams, while cheaper models may look rougher. Additionally, when turning the key, a high-quality lock should produce a crisp sound, whereas a low-quality one might feel loose and make a dull noise when operated.
Experts also emphasize that door locks should be replaced every five years. "Over time, the lock cylinder naturally wears down, making it easier for keys with similar teeth to open the door," explained a local locksmith. "Most standard door locks should be replaced after five to six years of use." This advice is especially important for homeowners living in communities where doors were installed by real estate developers. These locks are often of lower quality, and since the same type is used across the entire community, the risk of unauthorized access increases. Many new residents report incidents where they accidentally enter the wrong apartment due to similar lock systems.
To avoid such issues, it's essential to replace lock cylinders regularly. Failing to do so can lead to serious safety risks, as a worn-out lock may potentially open multiple doors. Therefore, ensuring the quality of hardware components and maintaining your locks properly is key to preventing unnecessary problems and keeping your home secure.
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