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Thread: M bolt sizes to Allen/hex key.

  1. #11
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Not sure if this helps: https://en.wikipedia.org/wiki/Hex_key, but as far as I'm aware the metric designation for 'Allen' keys, is the distance measured in mm across the flats of the hex key.
    Barry

  2. #12
    Join Date: Oct 2011

    Location: Bacup

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    I'm Andrew.

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    Quote Originally Posted by Barry View Post
    Not sure if this helps: https://en.wikipedia.org/wiki/Hex_key, but as far as I'm aware the metric designation for 'Allen' keys, is the distance measured in mm across the flats of the hex key.
    Yes, that seems to be correct Barry. The difficulty comes when using a key to determine the M size for a bolt/screw. The same key will fit two different M sizes dependant on whether they are countersunk or socket head.

  3. #13
    Join Date: Jan 2009

    Location: Essex

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    Quote Originally Posted by RMutt View Post
    Yes, that seems to be correct Barry. The difficulty comes when using a key to determine the M size for a bolt/screw. The same key will fit two different M sizes dependant on whether they are countersunk or socket head.
    Yes, the 'M-' designation for the hex key has nothing to do with the M size of the bolt/screw, save the designation of the key can never be numerically larger than that of the bolt/screw, as the hole would be larger than the diameter of the shank.

    The knobs on my preamp are secured by grub screws that have a 'Torx' shaped hole. One of them (the imput selector) came loose, so I bought a set of Torx keys to tighten it. I had to buy a set as it was not all obvious what the correct size was. Even though I now know which key to use, the relation between the designation to some measured dimension still escapes me; and the Wikipedia article I cited does not explain it either.
    Barry

  4. #14
    Join Date: Jun 2014

    Location: Chorley Lancs

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    I'm Steve.

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    When I've needed any bolts I go into William Moore of Preston, which sells a lot of tools and every type of fastener. (Every town will have a place like that).

    I go in, and say "have you got bolts that will fit this nut?" They take me round the back, where everything is sorted on shelves, and after a quick search he finds what I'm after. "How many do you need?" he asks. I reply "Two". And he doesn't pull a face. We go back to the till, he presses a few keys, then says to me "36 pence please", and cheerfully prints out a receipt. I feel so guilty I vow that one day I'll buy something really expensive, but so far I haven't.

    Much better than faffing with tinternet imo
    Pining for the fjords? What kind of talk is that? And why did he fall flat on his back the minute I got him home?

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  5. #15
    Join Date: Jan 2009

    Location: Essex

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    You are very lucky to have a traditional 'ironmonger' near you. We have a B&Q where they do sell fixings individually, but the range is limited.

    I can't imagine finding a nut or bolt with, say, a 3/16 inch Whitworth thread.
    Barry

  6. #16
    Join Date: Jun 2014

    Location: Chorley Lancs

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    I'm Steve.

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    Honestly Barry, I'd be very surprised if they didn't have even that, and Whitworth isn't a word I've heard since school. B&Q are ok for a lot of stuff, but their expertise is usually limited to "If it's not over there, we don't have it"
    Pining for the fjords? What kind of talk is that? And why did he fall flat on his back the minute I got him home?

    T/T: Inspire Monarch, X200 tonearm, Ortofon 2M Black. Phono: Yaqin MS-22B CD: Densen Beat B400 Plus; Headphone/pre: Myryad Z40; Amp: Audion Silver Night 300b stereo
    Speakers: Zu Omen Def. Atlas Equator interconnects, Atlas Hyper 3.0 speaker cables

    T'other system:
    Echo Dot, Amptastic Mini-1, Celestion 5's, BK XLS-200 DF

    A/V:
    Panasonic 42" plasma, Panasonic Blu Ray, Sony a/v amp, MA Radius speakers, REL Storm sub

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