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15MM Tap......Drill Size

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  • boslab
    replied
    Originally posted by Puckdropper View Post
    Light bulbs use a completely different thread all together.
    I did think the ES screw was metric, like E12 is 12mm, E26 was 26 MM etc, have I got it wrong?
    Mark

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  • MattiJ
    replied
    Originally posted by Puckdropper View Post
    Light bulbs use a completely different thread all together.
    Yeah, how on earth americanos use E27 bulb socket?
    Shouldnt it be something like 1" 7/128" edison socket?

    Leave a comment:


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

    Leave a comment:


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

    Leave a comment:


  • danlb
    replied
    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

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  • Highpower
    replied
    Originally posted by JoeLee View Post
    Why do they all skip 15MM ??

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

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

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  • JoeLee
    replied
    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...................

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  • JoeLee
    replied
    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................

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  • elf
    replied
    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?

    Leave a comment:


  • j.bain87
    replied
    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.

    Leave a comment:


  • Doozer
    replied
    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

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  • larry_g
    replied
    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, 09:52 PM.

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  • Arcane
    replied
    It works the same for all threads with a 60o included angle.

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  • Mcgyver
    replied
    Originally posted by mikey553 View Post
    It goes the same way for all metric threads. OD-pitch=hole size.
    yup, its one redeeming feature

    Leave a comment:

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