Connect with us

How many different size banana plugs are there?

Discussion in 'Electronic Design' started by Don Lancaster, Sep 17, 2007.

Scroll to continue with content
  1. What are their proper names?

    And where can I find their intended dimensions?

    As near as I can tell, a "regular" banana plug fits a 0.15 inch jack.

    What might be a "miniature" banana plug fits a 0.12 inch jack.

    What might be a "subminiature" banana plug fits an 0.10 inch jack.
    Such as on the Triplett 310 multimeter.

    And there are apparently "oversize" banana plugs that fit an 0.25 inch hole.

    Can anyone verify the proper names and exact sizes?

    Many thanks,

    Don Lancaster voice phone: (928)428-4073
    Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552
    rss: email:

    Please visit my GURU's LAIR web site at
  2. Bananaplus are either 4mm or 2mm as far as I know.

  3. There are four sizes you are likely to meet. Normally called 2mm, 4mm,
    0.1" & 1/8". The 4mm, would be your '0.15"' one, with the hole slightly
    larger than you are measuring. The 1/8", would be your '0.12"' one. The
    0.1" variety, has the socket 2.64mm in diameter (0.104"). This is commonly
    called 'mini banana', and will be what is on the Triplett meter.
    The 2mm variety tends to be used only on stuff from places like Germany,
    while the 1/8" version, was common on British kit, perhaps 40 years ago,
    and I haven't seen this on sale in recent times.
    There are quite a few odd 'custom' varieties around. For instance, here in
    the UK, there are Fluke meters, with non standard ones, that were supplied
    to (back in the old days), BT.

    Best Wishes
  4. colin

    colin Guest

    I wonder why did they call them banana plugs ?
    I mean theyr not banana shaped,
    theyr not yellow, well ok maybe some of them are
  5. Eeyore

    Eeyore Guest

    What reason do you have for thinking they're specified in inches ?

    The only one I know that's called a banana plug (and it's very popular) is 4 mm.

  6. Phil Allison

    Phil Allison Guest

  7. Eeyore

    Eeyore Guest

    The way some are constructed (notably Hirschmann), the contact spring is
    slightly banana shaped.

  8. mpm

    mpm Guest

    I have a few in inventory and would have to resort to measuring them,
    but that probably wouldn't help you very much.(?)

    I can tell you this: For dual plugs, there are definitely different
    hole spacings.
    The "familiar" Pamona-type dual plug has about 1" space post-to-post,
    but there's another size that's about 150% that spacing. I suspect
    this could be for a higher current banana plug (as they so seem to be
    "beefier"), but I can't swear to it.

    ITT-Pamona (or some spelling like that), might be a good place to
    Google for the datasheets, and hence size info. I think Tyco also
    makes them these days.., and probably a hundred Chinese outfits whose
    names I can't pronounce, let alone spell.

    EF Johnson also used to make these back in the 80's.
    Not sure if they still do, but might also be worth Googleing.
  9. mpm

    mpm Guest

    As for exact name: I believe the receptable end is called a "5-way
    binding post".
    (even though, I can come up with a lot more ways than that to connect
    to it! Ha!!)
  10. G

    G Guest

    I call that the other plug. I pull out my old DEC patch cord sets, come in
    different colors, and I use the plugs from these when necessary. Thats all I

  11. JeffM

    JeffM Guest

  12. Robert Baer

    Robert Baer Guest

    You are full of it.
    The (standard) Pomona banana pair spacing is 0.75 inches, *NOT* one
    This 3/4 spacing is seen on many DVMs and curve tracers (includes
    scope plugins).

    Use DigiKey, and get the datasheet for the Pomona 1269; *NO*
    dimensions are one inch!
  13. Phil Hobbs

    Phil Hobbs Guest

    I suspect it's that the longitudinally split spring reminded someone of
    the way a banana peels.


    Phil Hobbs
  14. charrid

    charrid Guest

    Right you are - 3/4 inch has been the banana pair spacing standard
    since I remember, maybe 50 years ago. Living in Europe, I wandered,
    why the pairs of electrical contacts, on all test equipment and even
    the public power network were spaced 19 mm and not the nice round 20
    or so. Then on moving to the US it hit me - 19mm is 3/4 inch! (well,
    ignore the 0.05mm). So who started it - Edison?, Westinghouse?...

  15. colin

    colin Guest

    oo I didnt think of that.

    there seems to be several different types with different spring arangements.
    in the electronics lab at school we used to have ones wich were basically a
    bunch of
    7 or so springy wires wich worked quite well

    Colin =^.^=
  16. JeffM

    JeffM Guest

    VERY well...and after seeing them once, I never saw them again
    --AND I never found a place to BUY any.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day