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Need 6-32 x 4" brass screws for UR64/40/20-3F3 core set

Discussion in 'Electronic Design' started by Yzordderrex, Jun 18, 2013.

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  1. Yzordderrex

    Yzordderrex Guest

    I need to find a source for 4" brass screws to bolt my cores
    together. Seems I go through this exercise every few years, so I know
    they exist. My purchasing agent tells me he can get stainless but
    I've only used brass.

  2. Neon John

    Neon John Guest

    We get ours from McMaster-Carr

    John DeArmond
    Tellico Plains, Occupied TN
    See website for email address
  3. whit3rd

    whit3rd Guest

    If there's any flux leakage, brass (diamagnetic) doesn't become
    an important part of the magnetic circuit, while stainless (ferromagnetic) does.
    Another good diamagnetic material is nickel silver (stronger than brass) which
    one sees in lots of old meter movements.
  4. Tim Williams

    Tim Williams Guest

    AISI 304 is very nearly nonmagnetic (depending on hardness; permeability
    is single digits, near 1 in any case), and also has higher resistance than
    other metals (if any flux wants to go through it, it's welcome to; there's
    little eddy current stopping it).

    Surrounded by a massive block of ferrite, the thread material doesn't

    Now... you didn't mention if this is gapped. If it is, even brass and
    copper will heat up, because the fringing in the gap is quite intense.
    Gapped cores need external clips (away from the gaps, or on the opposite
    side of a singly-gapped core).

    As for all-thread, seconded.

  5. I've got a bag full of magnetic 1/4-20 brass screws.
    I can pick up a few of them with a strong magnet.
    George H.
  6. josephkk

    josephkk Guest

    No, JL. It depends on the particular SS involved, some are highly
    ferromagnetic, some are almost diamagnetic, most are in between.

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