Featured Screw size for main adjustment gear of Lonex M4 Hop-Up Chamber?

Discussion in 'Gun Building, Modifications & Repairs' started by Peeque, Apr 3, 2021.

  1. Peeque

    Peeque Well-Known Member Supporting Member

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    What size screw is used to secure the main adjustment gear on the Lonex M4 Hop-Up Chamber?

    M2 is too small, M2.5 is too big.

    Talking about this piece:
    20210403_145812.jpg
     
  2. Guges Mk3

    Guges Mk3 Administrator Staff Member Administrator Supporting Member Lifetime Supporter

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    I have a bin of old electronics coarse thread screws. It's not a fine thread in my experience.
     

  3. Peeque

    Peeque Well-Known Member Supporting Member

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    So it probably is an M2 than since M2.5 is wider than the hole. I will look for M2x0.4mm instead of M2x0.25mm.

    E: Wait, it looks like M2x0.4mm is the normal size for M2. Maybe it's an M2.2? I'll find a screw that works eventually lol.
     
    Last edited: Apr 3, 2021
  4. aotsukisho

    aotsukisho Well-Known Member

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    upload_2021-4-4_14-4-29.png
    M2x3.5x0.4mm wide button head. Your hole doesn't look threaded though.

    upload_2021-4-4_14-5-13.png
    Can count about 9 threads, 3.5/9~0.39
     
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  5. Peeque

    Peeque Well-Known Member Supporting Member

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    Maybe the M2 screws I have are really out of spec. I did buy them off Amazon.

    They measure 1.8x5.8x0.34mm.

    I ordered some proper M2x0.4mm screws from McMaster so if those don't fit than maybe the inside threads yeeted.
     
    Last edited: Apr 4, 2021
  6. Guges Mk3

    Guges Mk3 Administrator Staff Member Administrator Supporting Member Lifetime Supporter

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    it should be very coarse threads of which I don't think you will find them on the US market,.
     
  7. Peeque

    Peeque Well-Known Member Supporting Member

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    If the new screws don't work than I'll see if I can rethread it to M3 or find a other way to keep it on there.

    Are you talking like wood/plastic screw coarse or some custom screw size that I'll never find? aotsukisho's picture and measurements look to be a normal machine screw.
     
  8. Guges Mk3

    Guges Mk3 Administrator Staff Member Administrator Supporting Member Lifetime Supporter

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  9. Peeque

    Peeque Well-Known Member Supporting Member

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    The M2 screws from McMaster came today. They work. I got the pan head type and used a few shims to hold the gear down. I'm sure McMaster has the wide button head screws. I didn't care enough to look for them.

    These are M2x0.4mm, 5mm long. MMC P# - 92000A012.
    20210407_182213.jpg

    The M2 screws I got from Amazon are either trash or got mixed in with the wrong size.
     
    Last edited: Apr 7, 2021
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