ThePipingMart Blog Fasteners What is Allen Screw? Uses and Dimensions

What is Allen Screw? Uses and Dimensions

Allen Screw

If you’ve ever worked on a project requiring small screws, then chances are you’ve heard of the Allen screw. Commonly used in woodworking, this type of fastener is also known as a hex head cap screw or hex drive screw. In this blog post, we’ll discuss what exactly an Allen screw is and how it can be used in various applications.

What is Allen Screw?

An Allen screw is a type of fastener with a hexagonal socket in the head. It is often made from hardened steel and has a wide variety of uses due to its strength and durability. The most common sizes for these screws are M3, M4, M5, and M6.

Allen Screw Uses

Allen screws have many practical applications due to their strength and versatility. They are commonly used in woodworking projects such as furniture and cabinetry as they provide superior holding power to other types of screws. This makes them ideal for securing joints or assembling frames. These screws can also be used in metal projects such as bike frames or car parts, where their strength allows them to bear heavier loads than other types of fasteners. Additionally, they are often used in the construction industry for things like electrical boxes or HVAC systems, where their ability to hold up under pressure is key.

 Allen screws are also popular among hobbyists who need small fasteners for projects like model airplanes or RC cars. These tiny screws can be difficult to work with but offer superior holding power compared to other types of fasteners, making them ideal for hobbyists who want maximum control over their creations.

Allen Screw Dimension

Allen Screw Dimension

Diameter Screw Head Body Diameter (D)
Diam, in (A) Height, in (H) Min Max
3/8″ 0.563 0.375 0.3750 0.3690
7/16″ 0.656 0.438 0.4375 0.4305
1/2″ 0.75 0.5 0.5000 0.4930
9/16″ 0.844 0.563 0.5625 0.5545
5/8″ 0.938 0.625 0.6250 0.6170
3/4″ 1.125 0.75 0.7500 0.7410
7/8″ 1.313 0.875 0.8750 0.8660
1″ 1.5 1 1.0000 0.9900
1-1/8″ 1.688 1.125 1.1250 1.1140
1-1/4″ 1.875 1.25 1.2500 1.2390
1-1/2″ 2.25 1.5 1.5000 1.4880
1-3/4″ 2.625 1.75 1.7500 1.7160
2″ 3 2 2.0000 1.9640


In conclusion, Allen screws are versatile fasteners that can be used in a variety of projects ranging from woodworking to metal fabrication to hobbies like model building. Their strength makes them ideal for applications where heavy loads need to be supported, while their small size makes them perfect for intricate projects that require precision workmanship. Whether you’re looking for something extra strong or just need something small enough to fit into tight spaces, an Allen screw may just be the perfect solution!

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