Coatings for Flange Bolts: Zinc Plating, Black Oxide, Hot-Dip Galvanizing
Flange bolts are widely used in machinery, construction, automotive, and industrial assemblies. Since flange bolts are often exposed to different environments, the choice of surface coating plays an important role in corrosion resistance, service life, and overall performance. Understanding the differences between common coating options helps ensure that flange bolts are selected correctly for their intended applications.
As a professional fastener manufacturer, Xinchi is pleased to introduce the coatings for flange bolts.
Zinc Plated Flange Bolts for General Applications
Zinc plating is one of the most common surface treatments for flange bolts. Through an electroplating process, a thin zinc layer is applied to the surface of the flange bolt, providing basic corrosion protection while maintaining a clean and uniform appearance.
Zinc-plated flange bolts are commonly used in indoor or mildly corrosive environments, such as furniture structures, general machinery, and non-exposed industrial components. This type of flange bolt offers a good balance between cost and protection. However, due to the relatively thin coating, zinc plated flange bolts are not recommended for long-term outdoor use or highly humid conditions.
Black Oxide Flange Bolts for Precision and Appearance
Black oxide coating is often selected for flange bolts where dimensional accuracy and appearance are important. This process creates a very thin oxide layer on the flange bolt surface, resulting in a consistent black finish without significantly affecting thread dimensions.
Black oxide flange bolts are widely used in machinery, tools, and precision assemblies. When combined with oil or wax, black oxide flange bolts can provide short-term corrosion resistance. However, black oxide is not designed for harsh environments, and these flange bolts are best suited for indoor or dry applications.
Hot-Dip Galvanized Flange Bolts for Heavy-Duty Environments
For applications requiring high corrosion resistance, hot-dip galvanized flange bolts offer a more durable solution. During this process, flange bolts are immersed in molten zinc, forming a thick protective layer that bonds strongly to the steel substrate.
Hot-dip galvanized flange bolts are commonly used in construction projects, outdoor structures, power facilities, and infrastructure exposed to moisture and corrosive conditions. While the coating provides excellent protection, its thickness may affect thread fit and surface appearance. As a result, hot-dip galvanized flange bolts are typically chosen for heavy-duty applications where durability is prioritized over aesthetics.
How to Choose the Right Coating for Flange Bolts
When selecting a surface coating for flange bolts, factors such as application environment, corrosion exposure, and cost requirements should be considered. Zinc-plated flange bolts are suitable for general-purpose use, black oxide flange bolts are ideal for precision assemblies, and hot-dip galvanized flange bolts are recommended for long-term outdoor or high-corrosion environments. Choosing the right coating helps extend the service life of flange bolts and improves overall performance.
Manufacturing Advantages of Xinchi Flange Bolts
Xinchi Fastener Co., Ltd. is a professional fastener manufacturer specializing in the production of flange bolts and other industrial fasteners. We have a factory that was founded in 2007. The factory is equipped with 102 cold heading machines, with a daily output exceeding 10 million pieces. A modern manufacturing facility covering 30,000 square meters, consisting of two six-story buildings, ensures stable capacity and consistent quality.
Xinchi provides flange bolts with various surface treatments, including zinc plating, black oxide, and hot-dip galvanizing, to meet different application requirements.
We are the designated fastener supplier to“STAPLE”. As a trusted fastener supplier, Xinchi offers a wide range of high-quality fasteners, including nuts, screws, bolts, rivets, and washers. Our products are widely used in automotive, machinery, construction, electronics, and furniture industries, trusted by global customers for stability, precision, and durability.
With reliable production capability and flexible customization options, Xinchi supports both standard and customized flange bolt projects.