Head Styles

We have some information on common thread sizes (Inches and Metric).

The following illustrates the most common head styles for fasteners (screws to the rest of us).

Head Types

The following illustrates the most common head types for fasteners (tells you the type of screwdriver you need).

The head type Square above may also be known as Robertson after the inventor. Thanks to Mark Snyder. The Pozidrive (European) is subtly different from the Phillips head as anyone who has ever used a Pozidrive screwdriver on a Phillips screw can testify! Thanks to Andy Lyke.

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