Zinc vs galvanised screws: which one is best?

When it comes to choosing the right screw for the job, the type of plating it has makes all the difference. These special coatings determine the type of environments in which the screws work best and how long they will last. 

If you’re not too familiar with what different types of screw materials and platings mean, you might just ignore them altogether. However, we’re here to make sure you go into each project fully prepared.

So, what is the difference between zinc-plated and galvanised screws? And which one is best for your project? Stick with Efixings to find out. 

What does 'galvanised' mean?

When we say a screw is ‘galvanised’, we really mean that the steel screw has been coated with a protective layer of zinc to slow down rusting. 

Yes, you heard it right; galvanising also includes using zinc to increase the longevity and durability of the screw. Most people will think of hot-dip galvanising when they think of a galvanised screw, which involves submerging the fixing in molten zinc. 

After this process, the zinc cools down and bonds to the steel, resulting in a dull grey finish that appears rougher than shiny zinc plating. This zinc layer acts as a sacrificial barrier, protecting the surface underneath from rusting. 

However, there are a few methods of galvanising, such as electro-galvanising, a lighter form of the process. This is where zinc-plated screws come into play.

What does 'zinc-plated' mean?

As we’ve just mentioned, zinc-plated screws are actually produced by a type of galvanising process. 

During this process, the screw undergoes electroplating, which uses electricity to add a protective layer of zinc on the surface of the screw. To do so, it’s coated in a solution which contains zinc salts, and an electrical current deposits a shiny layer of zinc on the surface.

This layer of zinc gives the screw a shiny, silver appearance, which is why many people choose it for installations where appearance is important, such as home furniture. However, these screws still hold up in dry, indoor environments. 

Since zinc-plated screws also come under the category of galvanised screws, you should always check whether the screw has undergone hot-dip galvanising or electro-galvanising. 

Do zinc-plated screws rust?

Yes, zinc-plated screws will eventually rust over time, as the zinc-plated coating doesn’t provide long-term resistance, especially when used outside. 

When used indoors, the screw will appear shiny and function well for years, but as soon as it is exposed to a high-moisture environment, it’ll start to degrade quickly. For this reason, it’s best to avoid using them in bathrooms or kitchens. 

Galvanised or zinc plated: which one?

Find the right screw for the job with Efixings 

At Efixings, we’re experts in all things fixings. 

Our extensive range offers something for every job, from concrete screws to bolts and a variety of tools. Designed to last, we offer a range of fixings treated with special coatings, including zinc platings. 

Whether you’re a DIY enthusiast or a professional builder looking to stock up on screws, our range is affordable, reliable, and perfect for projects of all sizes.