M5x1.0 screws?
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M5x1.0 screws?

This is a discussion on M5x1.0 screws? within the General forums, part of the Caferacer.net Forums category; Well, the two screws that mount the lighting coil apparatus (around which the flywheel spins) to the engine case on my 1964 YG-1 are funky. ...

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Thread: M5x1.0 screws?

  1. #1
    Senior Member spacmanspif300's Avatar
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    M5x1.0 screws?

    Well, the two screws that mount the lighting coil apparatus (around which the flywheel spins) to the engine case on my 1964 YG-1 are funky.

    They're not M5x0.8, 10-24, or 10-32. Leaves me thinking they must be M5x1.0, which I can't find, even on special order from Fastenal. Anyone have a couple at least 25mm long? Otherwise I guess I'll drill and re-tap them slightly larger.

    Thanks. Also posted in Technical under 'YG-1 not starting', but I'm not seeing a lot of folks over there, lately.

  2. #2
    Senior Member freedomgli's Avatar
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    Funny you mention that. Just today I was looking for a M5x1.0 acorn nut as M5x0.8 wouldn't thread onto the stud but alas it seems to be a wildcard.

  3. #3
    Senior Member crazypj's Avatar
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    Never heard of 5x1 but I have used 5x0.75 and 5x0.50mm
    Try Victor Machinery exchange in NY, they have odd stuff I haven't been able to find anywhere else in US
    I dabble in rocket science, when I\'m not picking my nose
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    Senior Member HackAsaw's Avatar
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    I am pretty sure I have some.....


    That's quite coarse

    First step.... see if msc or mcmaster has the taps/dies


    Fa$tenal sucks with their outrageous prices and very limited selection


    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

  6. #5
    Senior Member HackAsaw's Avatar
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    I am pretty sure I have some.....


    That's quite coarse

    First step.... see if msc or mcmaster has the taps/dies


    Fa$tenal sucks with their outrageous prices and very limited selection


    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

  7. #6
    Senior Member spacmanspif300's Avatar
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    quote:Originally posted by HackAsaw

    I am pretty sure I have some.....

    That's quite coarse

    First step.... see if msc or mcmaster has the taps/dies

    Fa$tenal sucks with their outrageous prices and very limited selection

    It's impossible to know for sure what I need since all I have are negative comparisons. No positive. I THINK it's a M5x1.0, and I have read somewhere that Japanese manufacturers used this size briefly early on.

    The closest one by comparison (of the three listed above) is the 10-24, but that's slightly too coarse.

    Assuming that retapping is the way forward, and that what I have are M5x1.0 holes, what would the next safest size up be? Aluminum cases. I'd like to stick with metric, so as not to cause unnecessary confusion for the next owner.

    As a note, I plan to upgrade from philips flat head to flat head socket head cap screws. The whole reason I got screwed is that the head was mangled beyond usability.

  8. #7
    Senior Member spacmanspif300's Avatar
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    quote:Originally posted by HackAsaw

    I am pretty sure I have some.....

    That's quite coarse

    First step.... see if msc or mcmaster has the taps/dies

    Fa$tenal sucks with their outrageous prices and very limited selection

    It's impossible to know for sure what I need since all I have are negative comparisons. No positive. I THINK it's a M5x1.0, and I have read somewhere that Japanese manufacturers used this size briefly early on.

    The closest one by comparison (of the three listed above) is the 10-24, but that's slightly too coarse.

    Assuming that retapping is the way forward, and that what I have are M5x1.0 holes, what would the next safest size up be? Aluminum cases. I'd like to stick with metric, so as not to cause unnecessary confusion for the next owner.

    As a note, I plan to upgrade from philips flat head to flat head socket head cap screws. The whole reason I got screwed is that the head was mangled beyond usability.

  9. #8
    Senior Member craig641's Avatar
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    Are you sure this thread is metric? It's not one of the earlier JIS thread is it? Do they have small dimples in the head of the screw?

    Craig

  10. #9
    Senior Member craig641's Avatar
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    Are you sure this thread is metric? It's not one of the earlier JIS thread is it? Do they have small dimples in the head of the screw?

    Craig

  11. #10
    Senior Member JackC's Avatar
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    Some of my early 60's Hondas have the JIS threads on SOME screws, like the points cover. I just ran a standard metric thread tap in the hole, don't recall the size, but will check tonight, and used the proper metric allen head screw. Didn't even have to drill it out, of course it was soft aluminum.

    Good luck finding JIS threaded nuts, bolts or screws.

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