What are the Most Common Fastener Coatings?

July 29, 2016

When you need to select the ideal fasteners for your task, you must consider all their characteristics to ensure that you choose the right ones for your intended purpose. For example, if you are constructing the framework of a skyscraper, and you require stainless steel bolts or screws for the task, you must ensure that they are the right thickness, length and style to hold the structure together securely in order for people to use the building safely each day. To make an informed decision on this or any other project as far as fasteners are concerned, you will also need to understand what type of coatings the fasteners need to perform their job in an optimal manner. Coatings are important since they increase the durability and lifespan of the fasteners in the specific task and location that you install them. Carefully research the coating that is the best for the task you require the fasteners to perform for you before you purchase the fasteners. Below, we explain some common fastener coatings to start you on your way with this research.

1. Clear Zinc

Clear zinc is a highly popular coating for fasteners since it is inexpensive, and the fact that it offers adequate protection from oxidative damage, such as rust with certain metals. Experts often recommend clear zinc coating when fasteners will be in high-humidity locations that increase the risk of rusting.

2. Galvanised

Gavanised is another type of zinc coating for fasteners. In this instance, a thick layer of the zinc is applied through the process of hot dipping. After this, the fasteners spin in a centrifuge to remove the excess zinc before they are allowed to dry. The galvanised coating is ideal for outdoor applications.

3. Gray Phosphate

Another type of common fastener coatings is gray phosphate. This coating is provided by a solution with phosphoric acid and only offers minimal corrosion protection, though, so you should not use fasteners with it in areas that are high risk for corrosion, such as damp conditions. However, this coating performs well in dry conditions, such as interiors of buildings or in vehicles.

4. Yellow Zinc

A coating of yellow zinc is applied to fasteners electrically, but it is another coating that offers just minimal protection from corrosion. You should only turn to fasteners with this coating for applications in dry conditions and avoid using them when they will come into contact with water or scenarios in high humidity.

The above are just a sampling of the common fastener coatings available on the market today. To learn additional facts on this topic and the fasteners and accessories that we offer, consult with our company.

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