If your work requires the use of fasteners, nuts, and bolts, you want to make sure that you’re using the right product to fit the job. But, given all the options and variations of these products available, it can be challenging to know which option you should select.
Between selecting the right head type and screw drive type, you may also realize that you need to select the right materials too. At IMS Bolt, we offer a wide variety of fasteners in various finishes, so you can find one that fits your budget and the project at hand. Below, review some of the most common fastener finishes.
Galvanized Finish
One common option that you’ll find for fasteners is galvanized steel. This refers to a coating that gets applied to the surface of the steel to help it resist corrosion.
Steel is already naturally corrosion resistant, but the galvanized finish adds an extra layer of protection–especially when used in harsh environments. As a result, galvanized steel tends to be even stronger than stainless steel.
Because of this, galvanized steel fasteners are commonly utilized on outdoor projects or heavy-duty construction. Any structures like fences or railings that are exposed to water frequently can benefit from galvanized fasteners because corrosion is more common in these conditions.
Plus, the Department of Transportation tends to use a lot of galvanized steel fasteners on signposts and road signs given their long-term exposure to the elements.
Black Oxide Finish
Another common finish you’ll find for fasteners is a black oxide finish. Black oxide is a conversion coating that gets applied to the surface of both alloy steel and stainless steel. Through the oxidation process, the outer layer of the stainless steel is chemically converted to black magnetite.
While galvanized steel tends to be utilized solely for practical and functional purposes, a black oxide finish on fasteners also adds aesthetic benefits. Not to mention, a black oxide finish makes the fasteners stain resistant and less susceptible to corrosion and abrasion.
So although the black oxide finish offers an appealing appearance, these fasteners still carry all the incredible functional benefits you need from steel nuts and bolts.
You will commonly find this finish available on fasteners utilized on machines, automobiles, and more. This is because the black oxide finish that’s added is so thin that it doesn’t alter the dimensions of the fastener. So, these can be utilized in machinery where precision is required for proper performance, but you still want a certain aesthetic.
Plain Finish
As the name might suggest, a plain finish on fasteners means that there has been no extra finish added to the item. The metal surface is bare, meaning it has the corrosion resistance that the metal has naturally and no added protection.
The plain finish on fasteners like nuts and bolts is commonly used for bulk purchases and used in production. Plain finish fasteners can be used indoors or outdoors. However, they are typically utilized in structures or areas where corrosion is not a concern since they do not carry an extra layer of protection like other types of finishes.
Zinc
Zinc plating is very popular in hardware fasteners. There are various types of zinc finishes such as Yellow Zinc (most resistant to corrosion), Black Zinc (slightly less resistant than Yellow), and Clear or Blue Zinc (least resistant). Like some of the other coatings and finishes we’ve discussed here, zinc plating offers a wide range of options depending on your project needs.
The zinc plating process is achieved through a thin layer of electroplated zinc being applied to the fastener, which is then covered in chromate to create the finished product.
The zinc and chromate work together to protect the steel fastener underneath, offering great corrosion and degradation resistance. Because of these properties and the pleasing appearance of zinc-plated fasteners, these fasteners are quite versatile and can be used indoors or outdoors.
Black chromate is known for its ability to provide additional corrosion protection, preserving the zinc plating and offering a dark to deep black appearance, depending on the surface condition of the part. Meanwhile, black zinc is commonly specified for its protective properties and distinctive dark aesthetic.
Yellow zinc coatings are named for their electro-plating process, resulting in a beautiful golden color. These fasteners with yellow zinc coating are particularly well-suited for situations where the product may encounter water or other liquids.
Stainless Steel
Lastly, stainless steel is a highly popular and versatile finish for fasteners. This is largely due to its durability, corrosion resistance, and attractive appearance.
Whether they are used in construction, automotive, marine, or household applications, stainless steel fasteners offer long-lasting performance and maintain their visual appeal over time.
Stainless Steel Types
There are numerous stainless steel varieties that are compatible with a wide variety of applications.
18-8: The most common grade. Durable, corrosion-resistant, and largely used for marine applications.
316: Recommended for more severe or harsh environments, with even greater corrosion resistance than 18-8.
410: General purpose. Commonly found in roofing, siding, and self-tapping screws.
A2: Metric equivalent to 304 or 18-8 stainless steel.
With its strength and resistance to rust, stainless steel ensures secure connections while adding a sleek and modern touch to your projects. When seeking reliable and stylish fastener finishes, stainless steel is a timeless option that combines functionality with a polished aesthetic.
No matter what you’re using the fastener for, make sure you select the right material and finish. Your selection can impact the overall appearance, longevity, and durability of the fastener, so keep in mind what each of these finishes offers to choose what’s best for your needs.