MTX Fill Plug Size and Thread Pitch

Discussion in 'Gen 1 & 2 - Engine, Exhaust, Drive Line & AC syste' started by myotis1134, Jan 11, 2019.

  1. myotis1134

    myotis1134 Member

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    1992 MTX.

    I'm looking for a replacement transmission fill plug. Apparently it has yet another funky size and pitch, which means I have to order it from someplace.

    My measurements lead me to believe the plug is 21mm dia, with a 1.50 pitch. Can anyone confirm that please?


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  2. blk\blk90

    blk\blk90 SHO Member Supporting Member

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    I didn't even see one on rockauto, mtx or atx. But calipers dont lie, it's probably an M21-1.5. If you have a dedicated nut/bolt store in your town I'd go there. We have a place in amarillo called amarillo bolt that has damn near anything you need fastener wise. You might check out something like that.
     
  3. myotis1134

    myotis1134 Member

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    Yeah I did an extensive online search and came up with nada. I also took it to the local fastener shop - AK bolt and chain, and they said I'd need to have one made.

    I'm thinking about finding a large socket-head bolt that I can have machined down to a M21. Naturally there are taps and dies in that size available - just not bolts or nuts - go figure.
     
  4. luigisho

    luigisho SHO Member

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  5. One_Shot

    One_Shot SHO Member

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    Most fill plugs like these are pipe thread which is tapered so that as you tighten it it gets tighter in the hole causing a compression seal.

    Not positive but based on your dimensions it looks to be a 1/2 in pipe plug to me. :shrug:
    Any regular ol hardware store should have one in stock to compare yours to.
     
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  6. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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    Go to any autoparts store. Dorman offers an assortment pack of plugs 1/8th up to 3/4". All parts stores have bins in the back with brass fittings. Tell them you are looking for Pipe Thread Plug and they should know what you mean.
     
  7. Irish Pride

    Irish Pride Irish Inside Staff Member Super Moderators

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  8. SHO1

    SHO1 Coke Is It!

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    Or get a slightly larger common thread plug and re-tap it
     

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