How to identify the material of the hardware lock
If the door lock is made of zinc alloy, it typically has poor hardness and rust resistance. Even with thick plating, it can easily fade, darken, or even blister and corrode over time. However, one advantage of zinc alloy is its ability to create complex shapes, especially through pressure casting. Many locks on the market with intricate designs are likely made from this material, so consumers should be cautious when choosing them.
Steel offers good strength and is cost-effective, but it's prone to rusting. It's often used for internal structural components of a lock rather than external decorative parts. Aluminum or aluminum alloys are lightweight and easy to shape, though they are generally softer compared to other metals. They are not as strong as steel, making them less suitable for high-stress areas. Copper, on the other hand, is one of the most commonly used materials in locks. It provides excellent mechanical properties, corrosion resistance, and ease of processing. Its natural color is appealing, and copper locks—especially those with forged handles—often have a smooth surface, high density, and no bubbles or sand holes. This makes them both durable and resistant to rust. Copper also allows for various surface treatments like gold plating, giving locks an elegant and luxurious appearance that enhances the look of any home.
When considering durability, stainless steel is often the best choice, especially for surface materials. The brighter the finish, the better the quality. Stainless steel offers high strength, excellent corrosion resistance, and maintains its color over time. However, there are different types of stainless steel, mainly classified into ferritic and austenitic. Ferritic stainless steel is magnetic and may rust if exposed to unfavorable conditions. Among all grades, 304 stainless steel is considered the highest quality and most reliable option for long-term use in locks.
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