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Is there a 13mm thread ?

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  • Is there a 13mm thread ?

    The issue; a threaded tube, thread unknown. May be 1/2 by 20 NF, or Metric. One clue leading to Metric is "Made in Italy" stamped on part (power washer wand) The threads don't match up perfectly to an SAE thread pitch gage, and I can't get a 1/2 * 20 die to thread on, but it may be because of gunk on the part. The tube itself measures quite a bit over 1/2", (about .514" ) but comes in at almost perfectly 13 mm diameter.

    I can't find any obvious taps or dies in 13 mm size.

    I'm usually an SAE type of guy, so guidance is appreciated,

    Gary
    Gary


    Appearance is Everything...

  • #2
    Google's your best friend:

    http://www.metric-tools.com/catalog/...27/8008998.htm

    Phil

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    • #3
      or:

      http://www.kstbrakehose.com/newEbiz1...6b901751ff29bc

      Comment


      • #4
        $79.44 Yikes !

        I might have to hand file these threads..

        Thanks !

        Gary
        Gary


        Appearance is Everything...

        Comment


        • #5
          The ever versatile fount of odd ball taps/dies www.victornet.com
          has 13Mx1.25 taps and dies for less than $16 (die) and $8 for the tap. They
          respond rapidly to phone orders, but still used hand written
          invoices a few yrs ago They do have a minimum order. These will not be
          junk dies/taps out of Bangladesh, but likely US or similar make quality.
          Last edited by sch; 12-24-2010, 07:40 PM.
          Steve

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          • #6
            Google really is your best friend:

            http://drillsandcutters.com/dwtsmh13...rbonsteel.aspx

            Phil


            Originally posted by goose
            $79.44 Yikes !

            I might have to hand file these threads..

            Thanks !

            Gary

            Comment


            • #7
              YES

              13 x 1, or 13 x 1.5 ,or 13x1.75, or 13x2.5

              taps £8 die £7

              for list goto- http://www.tracytools.com/tapsanddiesmetric.htm

              john
              John

              I used to be indecisive. Now I'm not so sure , but I'm not a complete idiot - some bits are still missing

              Comment


              • #8
                Thanks for the sources everyone. How's 20 tpi (English) versus Metric 1.25 threading? (If this is indeed the case here.) I carefully threaded a 1/2 by 20 tap in the female component, went in about 4 turns very smoothly. I didn't force the issue.

                Lathe cut threads; turn a piece of brass tubing to diameter, thread to 20 pitch ? It's for personal use, so I'm not particular. Or just use 1/2 brass tubing, a little undersized is the worry in that case.


                Thanks,

                Gary
                Gary


                Appearance is Everything...

                Comment


                • #9
                  Pitch

                  1.25mm pitch = 0.0492" pitch = 20.32 tpi ~ 0.05" pitch = 1/0.05 = 20tpi

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                  • #10
                    1/4 x 19 bspp straight thread or bspt tapered?
                    Last edited by robert; 12-24-2010, 10:35 PM.

                    Comment


                    • #11
                      Are you going all cheap on us now. Don't forget that it's a pressure fitting.

                      Either organise your lathe to cut metric threads or buy the correct thread die.

                      Phil

                      Originally posted by goose
                      Thanks for the sources everyone. How's 20 tpi (English) versus Metric 1.25 threading? (If this is indeed the case here.) I carefully threaded a 1/2 by 20 tap in the female component, went in about 4 turns very smoothly. I didn't force the issue.

                      Lathe cut threads; turn a piece of brass tubing to diameter, thread to 20 pitch ? It's for personal use, so I'm not particular. Or just use 1/2 brass tubing, a little undersized is the worry in that case.


                      Thanks,

                      Gary

                      Comment


                      • #12
                        Originally posted by robert
                        1/4 x 19 bspp straight thread or bspt tapered?
                        Ran into this exact samr thing this week at work. 1/4-19 BSPP
                        Forty plus years and I still have ten toes, ten fingers and both eyes. I must be doing something right.

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                        • #13
                          Originally posted by robert
                          1/4 x 19 bspp straight thread or bspt tapered?
                          Yes, the standard pipe thread (apart from the USA) seems the obvious first place to look for me too!

                          BSP basic major diameter is .518" (13.16mm). BSP has carried over into present-day pipe fittings in this part of the world, (and Europe as far as I know), though I don't have the specs in front of me at present to check if it is still 55 degrees etc.

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                          • #14
                            BSP thread

                            1/4" - 19 - BSP thread it seems to be.

                            OD = 0.518" = 13.16mm

                            19 tpi = 0.0526" Pitch = 1.34mm pitch

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                            • #15
                              I was wondering originally if it was a sample of non USA pipe threads.

                              It appears not the case with BSP. I'm getting about .512" to .515" range outside measure. The thread depth is not as deep, hard to measure, maybe .473". The pipe/tube appears to be chrome plated steel with spotty corrosion, so hard to measure precisely. The threading looks like regular 60 degree V shaped. There is no apparent taper to the threaded portion and there is no sealant as far as I can tell, (don't know if sealant would be used in any case.)


                              I've got some brass tube to mess around with and try making a replacement sometime this week. I figure brass would be an improvement, don't know why they'd use steel in the first place, the inside is rusted and the outside plating is about 50% gone. The entire tube slides in a protective plastic housing. The other fittings are brass.


                              Gary
                              Gary


                              Appearance is Everything...

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