![]() ![]() There is more to the question of strength and durability than a material’s ability to resist rust, however. With stainless steel, however, especially of 316 grade, this vulnerability is almost completely eliminated. Over time, however, this coating can be worn away, even if only in one small spot, leaving the rough steel underneath open to the elements. ![]() Now, that’s fine provided the zinc coating is never worn away somehow. Under that thin layer of hard-wearing zinc is plain black steel that is very susceptible to rust and corrosion. The problem is that this strength might only be skin deep, so to speak. This difference is the main factor in your choice between the two – but it isn’t the only one.Ī galvanized screw seems very strong to begin with – every bit as strong as stainless steel, surely. Galvanized fasteners, on the other hand, rely on their zinc coating for their rust resistance. A fastener that is made of the material is stainless from its thread to its core, from its head to its point and everywhere in between. ![]() The most important point is that stainless steel has its name because it is just that – entirely stainless, by its chemical composition, throughout. The presence of this tough metallic element improves the durability of the steel and adds rust-resistant qualities as well. It is an alloy that includes a significant quantity of chromium. In contrast, stainless steel does not need to rely on a coating to toughen and protect it. Black steel can start to rust quickly once exposed. Zinc is an extremely tough protector, but it is possible to wear it down, creating a weak spot through which the original steel is exposed to the elements. Let’s look at it from a few other angles before you make the choice.įirst of all, what is the difference between these two different types of fasteners? Galvanized screws are basically just black steel with a coating of zinc. Galvanized screws are often an attractive choice because they’re cheaper – nearly half the price of stainless steel. However, this is actually a very important point to consider before you buy your materials and get started on the job. When you’re planning some kind of outdoor structure, such as a deck, you might not usually stop and wonder whether you should use screws that are stainless steel or ones that are made of galvanized zinc. ![]()
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