Announcement

Collapse
No announcement yet.

15MM Tap......Drill Size

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • 15MM Tap......Drill Size

    I have 15MM 1.0 tap for a special job. I can't find a chart anywhere that gives the drill size. Every chart I've found goes from 14MM to 16MM. Why do they all skip 15MM ??

    JL.................

  • #2
    It is easy. 15-1=14 mm. This is your hole size for tapping. It goes the same way for all metric threads. OD-pitch=hole size.

    Mike

    Comment


    • #3
      Originally posted by mikey553 View Post
      It goes the same way for all metric threads. OD-pitch=hole size.
      yup, its one redeeming feature
      in Toronto Ontario - where are you?

      Comment


      • #4
        It works the same for all threads with a 60o included angle.
        Location: Saskatoon, Saskatchewan, Canada

        Comment


        • #5
          http://www.guhring.com/documents/Tec...utTapDrill.pdf

          I use the above chart. It gives the estimated thread depth for various tap drills.

          ,,,,,,,,,,,,, inch ....metric %
          M15x1.00 0.5492 13.950 81
          M15x1.00 0.5512 14.000 77
          M15x1.00 0.5531 14.050 73
          M15x1.00 0.5551 14.100 69
          M15x1.00 0.5571 14.150 65
          M15x1.00 0.5591 14.200 62

          lg
          no neat sig line
          Last edited by larry_g; 04-27-2017, 10:52 PM.
          near Salem OR

          Comment


          • #6
            Originally posted by mikey553 View Post
            It is easy. 15-1=14 mm. This is your hole size for tapping. It goes the same way for all metric threads. OD-pitch=hole size.

            Mike


            It works for inch threads too.

            --Doozer
            DZER

            Comment


            • #7
              The reason it is NOT on most thread charts, is because it's not a normal sized thread, somehow you have got your hands onto an oddball sized tap.

              Comment


              • #8
                Originally posted by mikey553 View Post
                It is easy. 15-1=14 mm. This is your hole size for tapping. It goes the same way for all metric threads. OD-pitch=hole size.

                Mike
                Doesn't the fit % matter?

                Comment


                • #9
                  Originally posted by j.bain87 View Post
                  The reason it is NOT on most thread charts, is because it's not a normal sized thread, somehow you have got your hands onto an oddball sized tap.
                  I have an odd ball job to do.

                  JL................

                  Comment


                  • #10
                    Originally posted by elf View Post
                    Doesn't the fit % matter?
                    Yes it does. I would like 75% thread engagement. The charts I have all show 65% and 75%.

                    larry_g posted this:

                    ,,,,,,,,,,,,, inch ....metric %
                    M15x1.00 0.5492 13.950 81
                    M15x1.00 0.5512 14.000 77
                    M15x1.00 0.5531 14.050 73
                    M15x1.00 0.5551 14.100 69
                    M15x1.00 0.5571 14.150 65
                    M15x1.00 0.5591 14.200 62

                    I'm guessing the last numbers are the % of thread engagement with the appropriate drill size listed after the tap size.

                    JL...................

                    Comment


                    • #11
                      15mm is a common spindle size for metric motorcycles. Wheel spindles, swing arm spindles etc. Have seen 1.25 as well as 1.00.

                      Comment


                      • #12
                        Originally posted by JoeLee View Post
                        Why do they all skip 15MM ??

                        JL.................
                        Here's one.

                        Comment


                        • #13
                          Originally posted by JoeLee View Post
                          I have 15MM 1.0 tap for a special job. I can't find a chart anywhere that gives the drill size. Every chart I've found goes from 14MM to 16MM. Why do they all skip 15MM ??

                          JL.................
                          The ISO standard apparently includes the concept of "preferred" sizes and pitches. Sometimes the pitch will be such that it makes for a weaker fastener (or so I was told) and so those are normally skipped. Those sizes are still in the ISO standard, they are just part of a "less desirable" class.

                          Some of the metric minded folks are convinced that you should never, ever use the size/pitch combinations that are not in the preferred group. Others point out that you can make a valid metric thread using any diameter and any pitch as long as it is measured in mm and meets the standard for the thread form.

                          Dan
                          At the end of the project, there is a profound difference between spare parts and left over parts.

                          Location: SF East Bay.

                          Comment


                          • #14
                            Originally posted by Mcgyver View Post
                            yup, its one redeeming feature
                            Dont worry.Eventually you guys will see the light

                            Comment


                            • #15
                              Originally posted by plunger View Post
                              Dont worry.Eventually you guys will see the light
                              Light bulbs use a completely different thread all together.

                              Comment

                              Working...
                              X