The Complete Guide to Screwdrivers - RS Components

Aug. 18, 2025

The Complete Guide to Screwdrivers - RS Components

Screwdrivers are a type of hand tool used for the insertion and removal of screws. They are available in a multitude of variations to correspond to the correct screw drive.

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The drive or head of a screw has a shaped cavity and protrusion that fits the screwdriver tip. A turning force known as torque can be applied in either a clockwise or counter-clockwise direction.

The screwdriver is one of the most essential hand tools in any tool kit. There are many situations and professions where a screwdriver is integral to carrying out a specific task revolving around loosening or tightening fasteners.

Some of the most common uses of screwdrivers include:

Electronics and electrical equipment
Opening mobile phones
Opening computers
Mechanical and industrial production
Woodworking and carpentry
Metalwork and fastening wood to metal
Flammable environments

It should also be noted that some specific types of screwdriver are best suited to certain applications. For instance, the best electrician's screwdrivers will be insulated to protect the user. Conversely, Phillips screwdriver uses are more varied as these tools are suitable for a range of general-purpose applications.

Triangle Screwdriver

Tools featuring a triangle screwdriver head are less common, but they are ideal for certain applications. The triangular screwdriver head is beneficial as its design makes it more secure and tamper-proof than alternatives. These tools are often used with appliances, toys, and electronics.

Magnetic Screwdrivers

Screwdrivers with magnetic tips allow screws to be attracted by magnetic force. This reduces the risk of accidentally dropping them. Magnetised tools are useful for working on electronics where screws are small and can be easily dropped into hard-to-reach places.

Ratchet Screwdrivers

Ratcheting screwdrivers have a built-in mechanism that allows the application of force only in one direction while allowing free movement in the other direction. These hand tools function similarly to ratchet spanners.

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Screwdrivers come in many different sizes. As well as the standard large, medium and small, there are also stubby screwdrivers that are ideal for use in tight or confined spaces. The tip width and the length of both the blade and the overall tool are usually measured in millimetres (mm).

You should note that some sorts and brands may offer different sizing options to others. For instance, there are four standard Phillips screwdriver sizes. These range from #0 to #4, where #0 is the smallest screwdriver.

Some tools can also be classified by torx size. This is shown by the letter T followed by a number - for example, T10 screwdrivers. It ranges from miniature screwdrivers right up to T45 and beyond. This system can also be applied to screws, helping you choose the corresponding screwdriver for a particular sized screw.

Can You Use a Magnetic Screwdriver on a Computer?

Yes - the magnet is generally not strong enough to cause damage to electrical components. However, you should be careful not to touch exposed circuitry near screw holes on a motherboard or hard drive.

What are the Best Screwdrivers?

High-quality, good screwdrivers are available from a range of leading brands and manufacturers. However, the best screwdrivers will largely depend on your specific needs. For example, an electrician will have different requirements from a hobbyist.