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I would like to open up this power extension but these strange screws are in the way. I need some way to unscrew this without damaging it. Anyone know what kind of screw this is? What keyword would you search for?

screw

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  • 1
    Go to a decent shop and purchase the bit for it.
    – Solar Mike
    Jul 22, 2023 at 9:58
  • 1
    Could also be a rivet
    – Martin
    Jul 22, 2023 at 10:05
  • Maybe mention why you want to open it. CE mark is not recognized in US/Canada as a legal electrical mark, so if there is a problem with the unit, replacement might a better idea.
    – crip659
    Jul 22, 2023 at 13:31
  • Nothing wrong with it. I need to send the cable through a small hole in the wall. So I thought I could disassemble it, feed the cable through and put it back together. Jul 22, 2023 at 14:24
  • 1
    @mindlessgreen Running an appliance cord like that through a wall is distinctly not allowed by the electrical code.
    – Sneftel
    Apr 26 at 11:45

3 Answers 3

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Googled "Screw with three slits" and found the name "Tri-Groove Socket", that looks almost like the screws in you picture.

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They are classed ss security screws and they come in many shapes. The idea is to keep the consumer out of the boxes/ appliances.

However, any hardware store should have a selection of these bits for a screwdriver. You can find them on sites such as ebay and aliexpress.

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    And Amazon (as kits of assorted "security" bits), and...
    – keshlam
    Jul 22, 2023 at 15:23
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The appropriate screwdriver bit is contained in this set:

https://www.aliexpress.com/item/1005005412911655.html?spm=a2g0o.order_list.order_list_main.16.2a5d18027tLei8

The one on the right is what you need. If the three protruding parts are too wide, you should grind away a little bit from them with a small, oval-shaped grinding stone.

The set is also available from sites such as Amazon by searching for "three point screwdriver bit".

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  • Link only answers are frowned upon because if the link fails, the answer is useless.
    – JACK
    Apr 25 at 20:22
  • Are you sure that bit will fit the screws in the question? It looks like a lot of grinding away might be needed. Apr 25 at 20:28
  • For me, the diameter of the bits fit perfectly to the holes, but the wings were too wide, so I had to grind them a little. Apr 26 at 9:16

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