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Conduit Screws / Thread size

Discussion in 'Electrics UK' started by pte440, 13 Nov 2019.

  1. pte440

    pte440

    Joined:
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    Hi All,
    Odd one, can any one tell me what size screw is likely to have been used in besa boxes possibly going back to the '60's
    They certainly are not M4, M4 is too small..
    Any ideas? I am guessing an imperial size, but not sure what?

    Thanks as always
    P
    xx
     
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  3. rsgaz

    rsgaz

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    2BA.
     
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  4. OwainDIYer

    OwainDIYer

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    4BA for faceplates, 2BA tapped hole for earth?
     
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