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A machine screw is a blunt-ended screw that is used to fasten metal parts together. They can be coarse-threaded or fine-threaded and come in a wide range of head types. Most machine screws are fully threaded, which means the thread runs the full length of the fastener, from just under the head to the very end. You can learn more in our [guide to machine screws](/web/content/discovery/ideas-and-advice/machine-screws-guide).

RS offer an extensive range of high-quality metric and imperial fixings for all your metalworking and panel building needs.

### What are machine screws made of?

The fasteners are manufactured from a range of materials to suit various applications and environments. Materials include:

- Brass
- Steel
- Stainless steel- A4 (316) and A2 (304) grades
- Nylon

Some come with coatings such as nickel-plated zinc-plated, galvanized, or passivated which helps to deter rust.

### Head and drive types

Machine screws are available in a wide choice of driver and head types. Choosing the right fastener must be carefully considered.

### Head shapes

The most popular head types are countersunk or Cheesehead although there are other types around including Truss, Pan, Hex, and round.

### Drive types

A machine screw drive type refers to the type of tool you will use to install or remove the screw. There is a vast array of drive types, the most common being slotted, Phillips, Hex, and Pozi.

### Where would I use a machine screw?

The screws are typically used to securely fasten metal parts together in machinery, tools, and panels. They can also be used in:

- Appliances
- Electronic devices
- Vehicles


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Machine Screws & Bolts, Countersunk Screw | RS

Machine Screws

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<p>All of our machine screws are designed and manufactured for robust, secure fastening of metal parts and components. <strong>M4 countersunk screws</strong> are among the most commonly requested and universally adaptable types of machine screw we sell.</p><p><strong>M4 countersunk screws</strong> are ideal for a very wide range of uses, and available in most popular drive types including both pozi and slotted heads for compatibility with almost any modern <a href="/web/c/tools/screwdrivers-screw-extractors/screwdriver-sets/">screwdriver set</a> or <a href="/web/c/tools/power-tool-accessories-drill-bits/drill-bit-sets/">drill bit set</a>. They come in a range of metals, coatings or finishes, at standard metric lengths ranging from 4mm to 50mm and beyond. M4 is an especially common metric sizing, referring to a 4mm major diameter of the threaded screw or bolt shaft.</p><h2>How is a countersunk screw different from a non-countersunk screw?</h2><ul><li>Countersunk (or countersink) screws are designed to sit flush with the surface they're being driven into after fastening, meaning they don't protrude from the surface you've just screwed them into</li><li>Instead, they sit level with the surface (or slightly recessed, depending on the application and finish required)</li><li>Countersink screws are very often used on surfaces that will need to have objects or items placed on them later, and therefore need to remain stable and flush after finishing</li><li>They're also widely used wherever a neater look and smoother, more professional finished feel is desired, such as in many types of furniture and household fastenings</li><li>This sleeker appearance can be further enhanced by using a screw cap - or some other type of plug or patch - to cover over the area where the screw head remains visible</li><li>In order to achieve this flush finish, countersunk screws are designed with an angled or chamfered underside to their head (commonly 82.5 or 89.9 degrees)</li><li>This helps to guide the screw deeper into the surface material, rather than butting up against the surface as a flat-headed screw tends to</li></ul>

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