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  1. minimill

    minimill Barbados Swarf Registered Member

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    Hi there, new to the forum and to machining. can anyone tell me what is meant by (tap 0-80 .13 deep) i understand .13 means the depth of the hole , but 0-80 or 4-40 ?????
    i need help
     
  2. CluelessNewB

    CluelessNewB Active Resistor H-M Supporter-Premium

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    0 = screw size 80 = threads per inch. So yes it's calling for a 0-80 thread tap. Tiny! 0.06" diameter
     
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  3. Old junk

    Old junk United States Active Member Active Member

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    0-80 is thread diameter and pitch
     
  4. minimill

    minimill Barbados Swarf Registered Member

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  5. minimill

    minimill Barbados Swarf Registered Member

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    Thanks guys but thats so small by eyes cant see that nor my fingers holding it (wink)
     
  6. RJSakowski

    RJSakowski H-M Supporter - Premium Content H-M Supporter-Premium

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    I would add that the .13 means the depth of the fully cut threads.
     
  7. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    I can break a 0-80 tap taking it out of the drawer... :blowup:
     
  8. T Bredehoft

    T Bredehoft Active User H-M Supporter-Premium

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    I tapped 20 4-40 holes today, .200 deep, 7 turns on the crank in the lathe spindle, tap held in the tailstock. I was thrilled that I didn't leave the tap (or part of it) in any of the holes. I think I hit bottom twice, Saw the tap start to twist. Love those spiral flute taps.
     
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  9. dulltool17

    dulltool17 United States Active User Active Member

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    You actually have to touch it to break it?
     
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  10. darkzero

    darkzero Global Moderator Staff Member H-M Supporter-Premium

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    I used to tap 0-80 holes quite often. Everytime I did I was scared. Luckily I never did break my one & only 0-80 tap which is unbelieveable to me but just thinking about it now I have that scared feeling again.
     
  11. Bill Gruby

    Bill Gruby United States Global Moderator Staff Member H-M Supporter-Premium

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    Wait until you guys see some of the old horology threads, they can go to 0-160 or smaller. I have a few of these in sets with the dies to match.


    Billy G"
     
    Last edited: Apr 30, 2017
  12. Rockytime

    Rockytime United States Active User H-M Supporter-Premium

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    00-90 were pretty common for me when I was repairing model railroad engines.
     
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  13. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    Full disclosure: The smallest tap I have ever made a new hole with is 4-40, in aluminum. The smallest I have on hand is a 2-56.
     

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