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Zone 3 taps??

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  • Zone 3 taps??

    I've just been sorting through a box of ex-Ministry taps that I bought, noticed that a number of them are marked
    "**Whit Zone 3 HSS" (All are Goliath brand I think)

    What is Zone 3? Any clues? a grade of HSS, or a specific thread size tolerance? They look to be perfectly ordinary Whitworth taps, though I haven't tried measuring any. There was a bunch of Whit and UNC wire insert taps among them, but these are not insert taps.

    Thanks
    Tim

  • #2
    Its the uk version of 48 short of a secret area

    IGMC

    Dave
    Just south of Sudspumpwater UK

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    • #3
      zoning

      Zoning B.S 949/1951

      specified dims for taps there were 5 zones

      Zone 1 ground taps for precision class 3b

      Zone 2 ditto

      Zone 3 ground taps for commercial work medium fit class 2b

      Zone 4 ground taps used for machine nut taps

      Zone 5 cut thread taps

      from a CEJ booklet screwing taps and their uses


      Lee
      I no longer own tools I had.

      Comment


      • #4
        Originally posted by shadoof
        Zoning B.S 949/1951

        specified dims for taps there were 5 zones

        Zone 1 ground taps for precision class 3b

        Zone 2 ditto

        Zone 3 ground taps for commercial work medium fit class 2b

        Zone 4 ground taps used for machine nut taps

        Zone 5 cut thread taps

        from a CEJ booklet screwing taps and their uses


        Lee
        Thankyou.

        Bog standard taps, then

        Tim

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        • #5
          yep, bog standard.

          lee
          I no longer own tools I had.

          Comment


          • #6
            Here I thought it meant Chinese standard for the west, so that nothing would work right or could be disassembled so the great unlearned would run out and buy another, thereby guaranteeing Far East retirements.
            mark costello-Low speed steel

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            • #7
              Over here zones tell you when you can safely plant different things in the spring. We're in zone 7 so the zone 3 tap would have to go in much later than usual. I think for us it would mean count to four before you insert your tap. Dunno if I can wait that long.
              .
              "People will occasionally stumble over the truth, but most of the time they will pick themselves up and carry on" : Winston Churchill

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              • #8
                Originally posted by Timleech
                There was a bunch of Whit and UNC wire insert taps among them, but these are not insert taps.
                OK, ol' clueless here wants to know what the heck a wire insert tap is.
                Milton

                "Accuracy is the sum total of your compensating mistakes."

                "The thing I hate about an argument is that it always interrupts a discussion." G. K. Chesterton

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                • #9
                  Originally posted by DICKEYBIRD
                  OK, ol' clueless here wants to know what the heck a wire insert tap is.
                  Helicoils

                  see http://www.emhart.com/brands/heli-coil

                  Steve Larner

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