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Wire gauge, but for what sizes?

Discussion in 'Technical Discussion' started by Lutin, Mar 12, 2018.

  1. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    I picked up this, what I thought to be a drill size gauge, at a car boot sale recently -

    Hole_Gauge_Geo_Plumpton.jpg

    Though, having a google about, it appears to be a wire size gauge as the cut-outs are similar in shape to this one on fleabay -

    [​IMG]

    But I cannot work out what wire size series it is for. The holes do not correspond to SWG.

    Any ideas anyone?
     
  2. hotbulb

    hotbulb Active Member

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    The slots are the measure, not the hole, I reckon.
    Could be imperial Sheet Metal gauge, perhaps. 22 gauge is 25 thou, if you still have feelers in "real" sizes rather than metric! 18 gauge is 40 thou.
    (Imperial Wire gauge... 22 gauge is about 28 thou, 19 gauge is 40 thou ...1 mm near as-)
     
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  3. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Ah okay, that does make more sense.

    I shall get my vernier calipers and feeler gauges out (both metric and imperial) and have a see.

    Thanks.
     
  4. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Yep, measuring the gaps rather than the holes shows this to be a Standard Wire Gauge.
     
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  5. hotbulb

    hotbulb Active Member

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  6. Lutin

    Lutin Administrator Staff Member Forum Supporter

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    Should have been clearer. It's a standard wire gauge for Standard Wire Gauge. British Standard Wire Gauge to give its full title - as defined in BS 3737:1964. Wikipedia has all the details - standard wire gauge
     
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