ThePipingMart Blog Fasteners What is Allen Nut?

What is Allen Nut?

Allen Nut

Allen nuts, also known as hex socket head cap screws, are a fastener used in many applications across industries. These popular fasteners are characterized by their hexagonal-shaped sockets and have been used in the manufacturing and construction industries for decades. In this blog post, we’ll take a look at what Allen nuts are and how they are used.

What is Allen Nut?

Allen nuts are a type of fastener that consists of an externally threaded screw with an internal hex socket drive. They are made from steel or stainless steel and come in various sizes ranging from 4mm to 20mm. The most common size for Allen nuts is M3 (3 millimeters), but they can range from M2 to M20, depending on the application. The thread pitch of the nut will determine its size, with most being either metric or imperial threads.

Allen Nut Uses

These versatile fasteners have countless uses across multiple industries. They can be found in automotive applications such as engine mounts, suspension parts, brake calipers, and exhaust systems. They’re also commonly used in furniture assembly due to their strength and durability; they are capable of withstanding high levels of stress without loosening or breaking down over time. Additionally, they’re often found in electrical panels due to their ability to remain secure even when exposed to vibration or movement. Finally, they can be used on bicycles—they provide a secure connection between the frame and handlebars or other components that require a strong grip.


Allen nuts offer many advantages for use across multiple industries—they’re strong yet lightweight, easy to install, highly durable, and resistant to corrosion and rust due to their hardened steel construction. While there may be other fasteners available that can do similar jobs as Allen nuts do, few can match their versatility when it comes to providing secure connections in diverse settings. So if you’re looking for a reliable solution for your next project or application, consider Allen nuts for their quality build and dependability!

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