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Thread: Hex bits 6mm or 7mm?

  1. #1
    Master Franco's Avatar
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    Hex bits 6mm or 7mm?

    Hi guys, probably a question with obvious answers (not to me):

    Just got a flexible screwdriver, with a hex socket. When I use standard drill/screwdriver bits, they feel very loose in the socket.

    I measured the hex socket, is 7.32 mm. The hex bit (from dewalt) is 6.18.

    I thought hex bits and sockets were always around 6mm. Or they exist also as 7mm ( perhaps for automotive use, or with imperial measurements?).

    Thanks for any good reply

    Franco

  2. #2
    Master
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    Standard hex bits are actually a quarter of an inch, I have a 1/4" ratchet ring spanner for driving them in the tightest of places.

    There are however some larger sizes such as the ones that come with impact drivers so there are a range of fittings. I also have a screwdriver that seems to have a size of bit all it's own. Is the screwdriver a known brand?
    Last edited by Jeremy67; 27th October 2019 at 11:10.

  3. #3
    Master Franco's Avatar
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    No, it’s a generic ebay thing. Was wondering if there is a 1/4 in to 7 mm adapter I could use.

  4. #4
    You will find no such thing - they should all be 1/4" and anything other that won't fit is just poorly made tat.

    The only notable exception is impact drivers but then you only use the bits in the kit together.

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  5. #5
    Grand Master Glamdring's Avatar
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    Didn't I read somewhere than British Imperial is different from American Standard, and obviously different again from metric?

  6. #6
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    I guess I will throw it away and get a 1/4in (6.2mm) hex one

    Last edited by Franco; 27th October 2019 at 15:47.

  7. #7
    Master Franco's Avatar
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    Quick update: it turns out that 7.4 mm hex bits are used for hose clips , which for some reason are not the standard 1/4 in.

  8. #8
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    Wrap the bits in electrician's tape ?

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  9. #9
    Master
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    +1 for that.

    Jim


    Quote Originally Posted by amnesia View Post
    Wrap the bits in electrician's tape ?

    Sent from my OnePlus 6T using Tapatalk

  10. #10
    Quote Originally Posted by Franco View Post
    Quick update: it turns out that 7.4 mm hex bits are used for hose clips , which for some reason are not the standard 1/4 in.
    They're not really 'bits' so no reason they should be the same.

  11. #11
    Grand Master
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    Quote Originally Posted by Franco View Post
    Quick update: it turns out that 7.4 mm hex bits are used for hose clips , which for some reason are not the standard 1/4 in.
    Mystery solved, had me wondering for a while.

    The flexi-driver is designed solely for use on hose clips, I have one myself in the garage.

  12. #12
    Quote Originally Posted by walkerwek1958 View Post
    Mystery solved, had me wondering for a while.

    The flexi-driver is designed solely for use on hose clips, I have one myself in the garage.
    It confused me too as I have some US Snap-on stuff and whilst the sharp end of some of the bits are US sized the driver holds any std 1/4 bit.

  13. #13
    Master Franco's Avatar
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    Flexi drivers are also sold as 1/4 (in fact I bought one from Faithfull), useful for example if you want to screw in a tight space without using an Allen key (and using a bit instead)

    https://imgur.com/N40wKl1
    Last edited by Franco; 5th November 2019 at 15:04.

  14. #14
    Grand Master
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    Quote Originally Posted by Franco View Post
    Flexi drivers are also sold as 1/4 (in fact I bought one from Faithfull), useful for example if you want to screw in a tight space without using an Allen key (and using a bit instead)

    https://imgur.com/N40wKl1
    Franco, it’s a long time since I had the pleasure of screwing in a tight space.........

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