I'm looking at getting a set of small Phillips head screw drivers for disassembling electronics, and I was wondering how the size of screwdrivers are measured? I know screws come in standard sizes (M1, M2, M3 ...) Is the screw head part of that standard size, or does it have another sizing scheme?

  • have you visited a hardware store to see what they sell?
    – jsotola
    Commented Mar 2, 2019 at 4:40
  • @jsotola I was checking ebay and a lot of them were unlabeled
    – Qwertie
    Commented Mar 2, 2019 at 6:16
  • 1
    real hardware store, where you can touch the screwdrivers ..... lol
    – jsotola
    Commented Mar 2, 2019 at 6:21

1 Answer 1


The heads of screws typically do come in standardised sizes. However the sizing scheme differs from the the standard screw sizes.

For example Philips head screwdrivers typically come in PH0, PH1, PH2, and PH3 sizes. Though smaller (e.g. PH000) and larger sizes exist.

Similarly other heads such as Torx, PoziDriv and flat head screws have standardised sizes using similar naming schemes (e.g. PZ1, PZ2 for PoziDriv).

  • I ended up finding a ph000 head which fit the screw perfect!
    – Qwertie
    Commented Mar 1, 2019 at 23:04

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