1/4 40 tip lock but

Discussion in 'General Engine Discussion' started by Johnlukes, Dec 29, 2018.

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  1. Dec 29, 2018 #1

    Johnlukes

    Johnlukes

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    Hi all,
    My plans require a locknut 1/4 x 40 tpi, thought it would be straight forward to get on line and order a few, but although it would be possible to buy a tap and make a nut, nobody seems to sell this size, at least not on-line. In fact when I look through my Zeus book, I can’t find reference to a nut this size. it isn’t UNF, and I don’t know what other thread type it might be.
    I would ring the fastener shops, but being Xmas, they’re all shut!
    Not a massive deal, but thought I ask if anyone knows something I don’t..
    Thanks
    John
    UK
     
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  2. Dec 29, 2018 #2

    TonyM

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    You might find a locknut in steam fittings supplies. That's the sort of fitting size used on model boilers. Worst case you can buy a fitting and turn it to length.. They are most likely in brass though
    Like this https://www.ekpsupplies.com/brass-union-nuts.html
     
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  3. Dec 29, 2018 #3

    Andrew Stroud

    Andrew Stroud

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    1/4" x 40 tpi sounds like a Model Engineer (ME) thread
     
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  4. Dec 29, 2018 #4

    goldstar31

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    It's the classic and very useful 40TPI Model Engineers thread. The other one is 32TPI ME

    As you go through with model engineering you will come across 1/4" 40 TPI which is a means of measuring.
    A dial with 25 divisions equated to one thous per division.

    It doesn't really answer your question but that is what it is really about.

    So if you are still working in 'Imperial', you arm yourself with a die, appropriate taps and drills- for future needs.

    Norm
     
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  5. Dec 29, 2018 #5

    GRAYHIL

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  6. Dec 29, 2018 #6

    GRAYHIL

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    That company also do .25 x 40tpi model engineering taps!
    as do many others in the UK.
    Search EBAY for Model Engineering taps.
    Graham
     
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  7. Dec 29, 2018 #7

    spacy

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    where in the UK are you, happy to knock you one up as they are not a commercial item. Send me a PM for contact details
     
  8. Dec 29, 2018 #8

    GailInNM

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  9. Dec 30, 2018 #9

    TonyM

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    Last edited: Dec 30, 2018
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  10. Dec 30, 2018 #10

    goldstar31

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    From Tracy Tools in the UK a basic tap is only a couple of quid i.e. £2.
    I looked for Model Engineer( ME) in their lists.
    Of course, the difficulty might be how to get them 'across the Pond.'

    Norm
     
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  11. Dec 30, 2018 #11

    Johnlukes

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    Thanks all for the ideas. I am going for the buy a tap and make your own option - have just ordered the tap. I think that I would worry they the switch locknuts wouldn’t be sufficiently wide, this is to hold a gear on a crankshaft after all, and I want to make sure I get a snug fitting thread and a nut of adequate width.
    Thanks again
    John
     
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  12. Dec 30, 2018 #12

    Jennifer Edwards

    Jennifer Edwards

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    Hi John,

    I am building a beam engine that requires a few different imperial threaded fittings including a 1/4 x 40 TPI one. Rather than switch to similar metric sizes I thought I would single point the male bits and use bottoming taps for the internal threading.
    I found sets of three taps available on Amazon.
    I bought the entire set but they are available in sets of three (starting, finishing, and bottoming) in individual sizes too. Here is a link: https://www.amazon.co.uk/gp/product/B01LY0TFQF/?tag=skimlinks_replacement-20

    Here is the 1/4 x 40 set:

    https://www.amazon.co.uk/dp/B01DW1G6SS/?tag=skimlinks_replacement-20


    Good luck with your project in the new year!
    Jenny
     
    Last edited: Dec 30, 2018
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  13. Dec 31, 2018 #13

    comstock-friend

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    This is a useful book for playing this game. Pages 86-87 of this edition has the Model Engineer Standard (M.E.) and Special Fine Threads chart. ME 40 and 32 tpi taps and dies are readily available, ebay and brick and mortar stores (especially in the UK). Screw Threads and Twist Drills.jpg
     
  14. Dec 31, 2018 #14

    Johnlukes

    Johnlukes

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    Thanks Jenny, I ordered a set from RDG before I saw your post.
    happy new year :)
     

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