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Socket Screws

Socket screws are also known as Allen head screws.

At Bolt World, we offer a variety of socket screws for your needs. Socket screws can be used to create a strong connection between two materials, such as metal and wood, or metal and plastic. The socket head allows for a larger bearing surface than other types of fasteners, allowing more torque to be applied when tightening the screw. The sizes we offer start from M2 and go up to M30. View our product range below!


Socket screws or socket bolts are fastened using a hexagonal or shaped wrench, requiring a key to tighten and remove. Socket screws are also known as Allen head screws or Allen head bolts, they come in various head shapes like button head, cap head, grub head, and countersunk heads.

Socket screws are machine screws with an internal hex socket (Allen) drive. A set screw or grub screw, is a type of screw generally used to secure an object within or against another object, normally without using a nut.

The main way to check if any machine screw is a socket screw is to check the head; if the head requires an Allen key, then it is regarded as a type of socket screw.

We have a wide variety of quality socket screws in a range of finishes.

  • Metric socket cap
  • Stainless steel socket screws
  • Metric socket, countersunk screws
  • Metric socket button
  • UNC socket cap and socket button
  • UNF socket cap and socket button
  • Flanged socket button
  • Low-head
  • Fine pitch socket cap screws
  • Metric threads cup point grub
  • Metric cone point grub screws

Our extensive range of Allen head screws covers 8.8,10.9, & 12.9 grades of high tensile steel, as well as A2 stainless steel bolts and A4 Marine Grade stainless steel bolts.


All our screws come with no minimum order; you can order as little as one screw! 

For customers in the UK, our courier will normally dispatch your order to you within 1-2 business days. For international orders, please contact us for delivery times and rates.

We have hundreds of products so if you still can’t find what you’re looking for, please contact us at 01375767780.


What is the difference between Allen key screws and Allen head screws?

Allen key screws and Allen head screws are both types of socket screws, but they differ in their respective head shapes. Allen key screws—or cap screws, as they are sometimes known—have a hexagonal or six-sided head that allows for a wrench to fit into it. On the other hand, Allen head bolts have an internal recess that requires an Allen key or wrench to turn them.

What size are socket screws?

Socket screws come in a variety of sizes, ranging from M2 up to M30. The size chosen depends on the material being fastened and the amount of torque required for a secure connection. Due to their strength and stability, socket screws are often used in applications that require precision alignment or have high load requirements. They are also common in applications where vibration is present.

What size are electrical socket screws?

Electric screws are typically M2.5, M3, or M4 in size and usually have an Allen head. The screws may also be available in a variety of lengths.

Why do I need electrical screws?

Electrical screws are designed to provide a secure connection between two or more electrical components, such as wires and switches. They come in different sizes and styles, depending on the type of application they are used for. Electrical screws are essential for ensuring a safe and reliable electrical system, as they ensure that all connections stay tightly connected.

Do you sell long socket screws?

Yes, we do sell long socket screws. We sell these screws in a variety of different lengths to suit your application.