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A rather strange tap, NOT what I expected

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  • #31
    E Keeler catalog, printed when?
    First electric tool, when?
    https://www.sparkenergy.com/when-wer...ools-invented/

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    • #32
      Originally posted by reggie_obe View Post
      E Keeler catalog, printed when?
      First electric tool, when?
      https://www.sparkenergy.com/when-wer...ools-invented/
      The book doesnt say, which is odd. E. Keeling Co goes back to the 1860s. JR

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      • #33
        Originally posted by 754 View Post
        Did everyone on here MISS it.?.
        I showed 3 current suppliers some WELL KNOWN SUPPLIERS... Today of grease nipples in that size... there is one application..
        none that probably a lot of us have seen..
        but they are 1/4 npt... That's not what Jerry has.

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        • #34
          Originally posted by JRouche View Post

          Lightning made some taps of that size. ........
          Yep, 16 (!😶!) 18,20 thru 26, but no 28..... MUST be an old book.
          4357 2773 5150 9120 9135 8645 1007 1190 2133 9120 5942

          Keep eye on ball.
          Hashim Khan

          Everything not impossible is compulsory

          "There's no pleasing these serpents"......Lewis Carroll

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          • #35
            Originally posted by 754 View Post
            Did everyone on here MISS it.?.
            I showed 3 current suppliers some WELL KNOWN SUPPLIERS... Today of grease nipples in that size... there is one application..
            none that probably a lot of us have seen..
            Those are 1/4" straight PIPE threads, which are about 3/8" to 1/2" diameter. I found one source for 1/4"-18 hex head bolts, from a military fastener supplier.
            http://pauleschoen.com/pix/PM08_P76_P54.png
            Paul , P S Technology, Inc. and MrTibbs
            USA Maryland 21030

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            • #36
              Originally posted by PStechPaul View Post
              I found one source for 1/4"-18 hex head bolts, from a military fastener supplier.
              Meaningless. At one time, any wholesale fastener company would supply you with any diameter, thread, head, finish, etc. with just a little leed time. It's what screw machine shops were all about.

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              • #37
                Top ad is a tapered threads the other 2 state size as 1/4 in.. one specifically says STRAIGHT Thread..... one has a 3letter designation....

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                • #38
                  https://www.engineersedge.com/fluid_...eads_13376.htm

                  1/4-18 is 0.517" to 0.526" major diameter.

                  Click image for larger version

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                  http://pauleschoen.com/pix/PM08_P76_P54.png
                  Paul , P S Technology, Inc. and MrTibbs
                  USA Maryland 21030

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                  • #39
                    Yes a tapered pipe thread. . I gave an example of 1/4 diameter x 18 tpi grease nipples..

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                    • #40
                      That chart is for STRAIGHT pipe threads. Believe what you want. I give up.
                      http://pauleschoen.com/pix/PM08_P76_P54.png
                      Paul , P S Technology, Inc. and MrTibbs
                      USA Maryland 21030

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                      • #41
                        I did not catch that part m I will go back to read description of what I posted.

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                        • #42
                          The ¼"-18 thread that is the subject of this thread has nothing to do with pipe thread... It's a plain Jane machine screw thread with ¼" O.D. and 18 threads per inch. ¼" -18 pipe thread is something else altogether. The reasons for the push for standardization of threads way back then are evident even today!

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                          • #43
                            I believe this is an old obsolete auto thread from about a hundred years ago or perhaps a bit more. Back than as we all know there were a lot of obscure threads sizes before standards were set. I have some old automotive fastener catalogues that list not only the 1/4x18 thread size but also 1/4x10 and 1/4x16, plus others too numerous to mention.
                            Fortunately standards have been in place long enough now that we don't bump into this too often anymore unless doing an old restoration where one needs to keep all aspects 100% original.

                            Oddly enough MSC still stocks this tap.
                            https://www.mscdirect.com/product/de...rItem=04840195
                            Home, down in the valley behind the Red Angus
                            Bad Decisions Make Good Stories​

                            Location: British Columbia

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                            • #44
                              A 10 tpi thread on a 1/4" screw is pretty goofy. I modeled one up in CAD, and I wonder if it might have been a 2 start thread. The model was pretty strange-looking.

                              The reason I ask about the 2 starts, is because a standard 10 tpi thread would leave a pretty small core area on a 1/4" diameter, it seems more like a sheet metal type screw than a machine screw
                              4357 2773 5150 9120 9135 8645 1007 1190 2133 9120 5942

                              Keep eye on ball.
                              Hashim Khan

                              Everything not impossible is compulsory

                              "There's no pleasing these serpents"......Lewis Carroll

                              Comment


                              • #45
                                Originally posted by 754 View Post
                                Top ad is a tapered threads the other 2 state size as 1/4 in.. one specifically says STRAIGHT Thread..... one has a 3letter designation....
                                Ya, but it was still a PIPE thread with parallel threading so the body of the threads was still up around the 3/8'ish size of a 1/4" pipe thread. Compare the threads to body size of Jerry's tap to your pictures. Vast difference easily seen just by looking at the pictures of the grease nipples.

                                As for stove bolts I'm guessing that they were kept fairly coarse because of the heat rusting out the threads faster? So using coarse threads keeps them holding things longer?
                                Chilliwack BC, Canada

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