Thread Galling: Why Stainless Steel Fasteners Seize and How to Prevent It
November 5, 2026
Thread galling can cause stainless steel nuts and bolts to seize during installation. Learn what causes it, which factors increase
Thread galling can cause stainless steel nuts and bolts to seize during installation. Learn what causes it, which factors increase
Discover how flange nuts distribute clamping force, simplify assembly and protect mating surfaces, plus when to choose them over a
Nyloc nuts provide a simple and compact method of resisting unwanted loosening, making them widely used across automotive, machinery, equipment
When a bolted connection is exposed to constant movement, vibration or heavy loads, preventing the nut from loosening becomes critical.
When selecting a fastening system, the nut itself can have a significant impact on how effectively a joint performs. Flange nuts offer a simple way to distribute clamping force across a wider area while reducing the need for additional components.
But what exactly makes a flange nut different, and when should you use one?
A flange nut is a hexagonal nut with a wide, integrated flange at its base. This flange acts similarly to a washer, increasing the bearing area where the nut contacts the mating surface.
Rather than concentrating the clamping force directly beneath the nut, the flange helps distribute that force across a larger area.
This can make flange nuts particularly useful where joint stability, assembly efficiency and protection of the mating surface are important.
One of the primary advantages of a flange nut is its increased bearing surface.
The wider base helps spread the clamping load over a larger area, rather than concentrating it around the relatively small footprint of a conventional hex nut.
This can help reduce localised stress on the mating material and provide a more stable interface within the assembly.
In many applications, a conventional nut is paired with a separate flat washer to increase its bearing area.
A flange nut effectively combines these two components into one.
This can mean fewer individual components to specify, handle and install, which can simplify assembly and reduce the chance of a washer being omitted during installation.
For repetitive assembly operations, eliminating an additional component can also make the fastening process more efficient.
Flange nuts are commonly used in machinery, vehicles and equipment where vibration and movement are present.
However, an important distinction needs to be made here: a standard smooth flange does not automatically make a nut vibration-proof.
Where resistance to loosening is particularly important, a serrated flange nut may be specified. The serrations beneath the flange can bite into the mating surface and increase resistance to rotation.
The appropriate solution ultimately depends on the joint design, materials, loading conditions and whether the assembly needs to be removed later.
Because the flange distributes load over a wider area, it can also help reduce concentrated pressure and indentation on the material underneath the nut.
This can be valuable when fastening sheet metal or other materials where excessive localised pressure could damage or deform the surface.
The flange should still be correctly matched to the application, as material properties and required preload remain important considerations.
Their combination of a compact design and increased bearing area makes flange nuts suitable for a broad range of engineering and manufacturing applications.
They are commonly found in automotive assemblies, construction and fabrication, agricultural machinery, industrial equipment and sheet-metal applications.
Different flange-nut designs are available for different requirements, so factors such as material, finish, strength class, thread specification, flange type and operating environment should all be considered when selecting a fastener.
There isn’t one solution that is automatically better for every application.
A flange nut can be useful when you want to simplify an assembly, reduce component count and provide a larger bearing surface in a single fastener.
A separate nut and washer, however, may provide greater flexibility where a particular washer material, diameter, geometry or function is required.
The correct choice should therefore be based on the requirements of the joint rather than convenience alone.
A nut may be a relatively small part of an assembly, but its design influences how load is transferred and how the joint performs.
Understanding the differences between fastening options such as flange nuts, Nyloc nuts, castle nuts and conventional hex nuts makes it easier to select a solution suited to the actual application.
Not sure which fastener is right for the job? Speak to the Bolt & Nut team for help selecting a solution for your application.
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