Screwdriver Sizes Chart

A full screwdriver set might seem like it has far more sizes than you will ever need, but then there comes a day where you realize that your screwdriver set is missing a size that you desperately need. It is thus better to buy the sizes that you need most rather than to buy a full set that you later find is incomplete.

Below you will find the 5 most common screw head shapes with the various sizes available.


Flat Head Screwdriver Sizes

A flat head screwdriver is also sometimes referred to as a slotted screwdriver. These screwdrivers are the easiest to recognize because of its wedge-shaped end.

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Hex Key Screwdriver Sizes

These hex keys are sometimes referred to as Allen wrenches and these screwdrivers usually come in an L-shaped key with no handle. Measurements for the sizes of hex keys are done across the flat parts of the hex.

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Robertson Screwdriver Sizes

The Robertson drive is commonly referred to as a square drive and is very popular in both electrical and construction fields. Like the Phillips screwdrivers, Robertson drives also make use of a numbering system. Robertson drives have corresponding color codes to make each size easy to identify.

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Phillips Screwdriver Sizes

The Phillips screwdriver has become the standard in many different countries. Phillips drives have become a very popular drive when it comes to precision work, that’s why it is used in electronics and laptops. Phillips screwdrivers can be used on many different cruciform screws.

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Torx Screwdriver Sizes

Torx drives are designed to function at higher torques than other screwdriver types and also have a longer lifespan. The Torx drive is sometimes referred to as a star drive due to the resemblance it has with its 6-point star shape. Torx drives have different numbers based upon the different distances between two opposing points.

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See more sizes charts here.