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Starrett 174 Tap Handle.. Need Internal Threads Please.

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by woochucker, Jul 17, 2016.

  1. woochucker

    woochucker United States Active Member Active Member

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    Just picked up a 174 tap handle for $1. I believe the smallest handle they make. it was missing the threaded side of the handle. Can someone give me the size of the screw, and TPI please. Would like to make a new handle.
    A pic would be great too, if you could.

    Thanks
    Jeff. SDC11748.JPG
     
  2. wawoodman

    wawoodman himself, himself H-M Supporter-Premium

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  3. Charles Spencer

    Charles Spencer Active User H-M Supporter-Premium

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    You could take it down to the hardware store and see what size screw fits it.
     
  4. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    I'm sure it's a non-standard thread. Pull out your taps and start trying one's until you get one that starts in the thread. Don't force it! If it will not go all the way in. The trick to it is to get one to start that has the thread pitch that matches the closest. Since your going to make the missing handle, tap out the hole with the tap that fits the hole the best.
    BTW- Push all your Metric taps the the side. Starrett does not use Metric threads in things like this. They will be Imperial thread pitches. Ken
     
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  5. Billh50

    Billh50 Active User H-M Supporter-Premium

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    Drew this from my tap handle. Starret had it's own threads back in the day. So mine looks be an odd ball thread.
     

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  6. Billh50

    Billh50 Active User H-M Supporter-Premium

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    After posting I was putting the screw back in and noticed it had a bit of a wiggle going in. I would try a 1/4 - 28 allen screw and if it fits just turn the end down so that any mushrooming on end will still allow removing.
     
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  7. Billh50

    Billh50 Active User H-M Supporter-Premium

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    Just tried a 1/4 - 28 screw as well as metrics. It is definitely one of the odd starret threads. I don't have wires to check the pitch diameter or I would do that for you also.
     
  8. 4gsr

    4gsr Global Moderator Staff Member H-M Supporter-Premium

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    It won't be metric!!! But at .222" OD could have been 12-28 NF thread?
     
  9. Billh50

    Billh50 Active User H-M Supporter-Premium

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    A 12-28 has a max major of .215
    So I really believe it to be one of Starret's own threads. Back in the day many of the machine manufacturers had their own threads. I remember re-tapping many holes for standard threads as I could not see paying $5 for one screw when I could buy a standard for $0.10
     
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  10. george wilson

    george wilson United States Global Moderator Staff Member H-M Supporter-Premium

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    Whittle a pencil down. Stick it in the hole and rub it on the threads. Then,check the pencil with a thread gage. Not hard to do.

    If it's an odd thread,turn out the missing handle on your lathe. I have never NOT been able to make threaded parts to fit 18th. C. parts that were missing threaded pieces,even left handed.

    Don't take the threaded part out of the chuck. repeatedly try screwing it into the hole and sneak up on it till it screws in. That is the simplest way to do the job rather than trying to figure out the actual diameter of the needed thread.
     
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  11. Billh50

    Billh50 Active User H-M Supporter-Premium

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    The Starret 174 tap handle I have is definitely a .222 - 28 thread.
     
  12. woochucker

    woochucker United States Active Member Active Member

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    Yep, I concurr it's .222 -28 was about right, did a quick test out of alum before I use a piece of SS. I already knew it was an Odd ball size as nothing I had fit.
    after reading about the wiggle I cut to .223 and then tested repeatedly instead of cutting deep. Then filed the tops of the threads down, fits nicely not too tight but no discernable wobble. I'll make one out of a piece of stainless I have.
    Thanks for the drawing and details much better than a picture. :)
    Thanks again.
     
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  13. Billh50

    Billh50 Active User H-M Supporter-Premium

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    always try to help
     
  14. EmilioG

    EmilioG United States Active User H-M Supporter-Premium

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    Starrett website has it as .231-28
    Check out the Starrett parts diagram download.
     
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  15. woochucker

    woochucker United States Active Member Active Member

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    Already made a replacement, thanks though
     
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  16. scwhite

    scwhite United States Active Member Active Member

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    That is a 12-28 thread
    Number 12 bigger than a 10 smaller than a 1/4
    My Cleveland twist Drill chart shows that tap
    As a 12-28
     
  17. scwhite

    scwhite United States Active Member Active Member

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    Here is the chart
     

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  18. EmilioG

    EmilioG United States Active User H-M Supporter-Premium

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    Are 12-28 taps still made?
     
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  19. scwhite

    scwhite United States Active Member Active Member

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    I would say yes but you are not going to find
    One at Lowes or Home Depot - or Harbor freight
    You will have to go to a machine tool supply
    And order one
    I would get all three if I was going to order them
    Plug - through- and bottom
     

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