While it is convenient to pick screws with magnetized tips I wonder if the magnetism can cause any damage to electronics?

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    It's going to depend on a) how strong the magnet is and b) the specific electronic component you are talking about.
    – ChrisF
    Commented Aug 14, 2011 at 16:32
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    CRTs, speakers, hard drives all have electronics and magnetic fields... A screwdriver tip can barely pick up larger screws, and I would imagine you'd need a Really Freakin' Big Magnet to damage a microchip. (Disclaimer: I mostly slept through Physics.) Commented Aug 14, 2011 at 16:37
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    If you stab the screen with the magnetic tip, then yes.
    – surfasb
    Commented Aug 14, 2011 at 16:46
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    Been using mag tipped screwdrivers around Electronics for 40+ years, no unintentional damage yet.
    – Moab
    Commented Aug 14, 2011 at 16:51
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    @Moab, “no un -intentional damage”? o.O
    – Synetech
    Commented Aug 14, 2011 at 17:32

10 Answers 10


If you're thinking that magnetic screwdrivers might corrupt data on hard disks, my experience is that it doesn't happen. I've used my magnetic screwdriver to drive screws into the holes on hard drives, and nothing bad has ever happe$#J@R(F$*U%&$#(J

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    Made me laugh. You really get a +1.
    – yakatz
    Commented Aug 14, 2011 at 20:09
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    If you've ever taken a modern hard drive apart, you'll know that they have some pretty string magnets inside them already. Not only are they much stronger than any magnetic screwdriver but they are inside the metal case of the hard drive too!
    – Mark Booth
    Commented Aug 15, 2011 at 14:56
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    I think you'll find that they are carefully designed to keep all the field between the drive coils and a really really small amount leaking out the side that could affect the disk. They are also very close together. A magnetic screwdriver could easily put more field in the disk region than the drive magnets.
    – Martin
    Commented Aug 15, 2011 at 16:19
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    note: hard drive magnets are actually a great way to magnetize a screwdriver in the first place. Commented Aug 16, 2011 at 7:59
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    > I've used my magnetic screwdriver to drive screws into the holes on hard drives, and nothing bad has ever happe$#J@R(F$*U%&$#(J Exactly; and there’s nothing wrong with parsing HTML with regular-expressions either.
    – Synetech
    Commented Mar 1, 2012 at 19:37

You could make an old time crt monitor display funny colors, not sure about 3.5" and 5" floppies.

But unless your screwdriver is with pretty big neodymium magnet head, you are highly unlikely to damage anything. Most electronic components are not ferromagnetic and inducing strong current inside them is hard to do. You will even have hard time damaging the data on a hard drive.

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    No, the screwdriver won't make the floppies display funny colours ;-)
    – Linker3000
    Commented Aug 14, 2011 at 19:06
  • @Linker3000, though some floppies are already funny colors. (I’d take a snap, if I could get my Big Box o’ Floppies out.)
    – Synetech
    Commented Aug 14, 2011 at 20:00
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    Wait, what about my 8" floppies - they always displayed funny colors. Commented Aug 15, 2011 at 12:26

Magnetic tips don't do damage unless there is power, at worst, they can change stored data.

A hard drive is sealed of by a metal case around it, and the distance to the internal components is big. So, it won't be affected. However, watch out with memory cards and ROM memory like the BIOS, although I would believe they are protected against static electricity there might still exist a small risk...

These are simple physics, the magnetic tip has a magnetic field which will induce ferromagnetic wave into the conductive materials around it. This induced power will be rather small, but depending on the amount of magnetic force the magnetic tip has it might be enough to change some bits when you get close enough to the magnetic parts of not properly shielded storage media...

  • The induced voltage from waving a magnetic screwdriver around an electronic component would be vanishingly small -- orders of magnitude less than that necessary to create a "static" hazard. Commented Aug 15, 2011 at 1:41
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    Yes, the physical damage from waving the 12 pound lug attached to my uberstrong screwdriver caused more harm when it cracked the drive case. :)) Commented Aug 15, 2011 at 12:29
  • @DanH: Waving? You must be joking. Commented Aug 15, 2011 at 13:52
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    @Tom Wijsman -- If you aren't waving it then no current/voltage is induced at all. Commented Aug 15, 2011 at 16:01
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    @Tom Wijsman -- What physical mechanism would cause damage to a semiconductor memory module from having a magnet nearby? Commented Aug 15, 2011 at 23:32

It’s unlikely that the magnet in your screwdriver is powerful enough. See this question on specifics about what can be harmed.


Let's put it this way: the risk is vastly less than the risk for causing damage if you lose or scratch a screw across a board.


In the old days, there used to be a lot of risk with computer innards and magnetic devices -- the hard and floppy drives used to be susceptible to magnetic scrambling.

Nowadays, not so much -- to get the density of 500 GB+ drives, the magnetic material on the platters is almost non-magnetic, and it requires intense local fields to change the bits -- such intensity is only acheivable with strong fields from the tip of the head at 0.1um or so from the surface. Nowadays, you could pick up the drive using a electromagnet from a crane and the data would not be damaged.


A magnetic screwdriver can damage certain components that operate from magnetic fields. The classical case was the old-fashioned tape recorder head (data or audio) which needed to be "degaussed" whenever you worked near it with any ferrous tools, even if not magnetized.

Of course, no one uses tape recorders any more, and for the most part things like disk drives are fully enclosed now and relatively insensitive to external magnetic fields. However, I would still advise that one not using a magnetic screwdriver when working on or around a disk drive, since drives are so thin and compact now that a screwdriver tip could get quite close to one of the heads. And, of course, diskettes can be damaged by a magnetic field that is strong enough (possibly a magnetic screwdriver laid on top of a diskette, eg). (Don't keep boot diskettes and the like in a toolbox.)

In terms of other components -- circuit boards, power supplies, CD drives, memory modules, etc -- a magnetic screwdriver (or any sort of permanent magnet less powerful than one used in an MRI machine) will not cause damage. (You can, of course, still cause damage to memory modules and the like due to static discharge, but magnetism had nothing to do with that.)


No, there's nothing to worry about, many modern laptops are full of magnets. The magnet I stick on my screwdriver when removing tricky / sticky screws came from a laptop lid. They are used to keep the lids closed on modern laptops without the need for mechanical latches (and occasionally to trigger the lid closed sensor). They are very strong magnets (much stronger than any screwdriver I've ever used) and quite often they come down very close to the hard drive, something I doubt the manufacturers would do if it caused any serious reliability issues.


We used magnetic screwdrivers in our shop...we fixed everything electronic including computers. I once saw a computer tech struggling to screw down a motherboard...I told him just use a magnetic screwdriver and he said oh no! I've read computer books that warn you never to use magnetic screwdrivers around a computer. I don't see how it could possibly harm the motherboard.


Magnetism in screwdrivers won't do a thing! I have a really strong magnet, so strong I can barely take it off my Hard Drive after I put it on, and there is no damage whatsoever.

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