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  1. #1
    Join Date
    May 2011
    Posts
    0

    1/4-20 Tap Tolerance

    Hello,
    I'm making an aluminum leveling fixture plate that will stand on 1/4-20 threads. I was looking into tap tolerances to find a tap that will make nice tight threads but it seems to be a complicated system and I haven't found much info. Can someone give me a brief overview of tap tolerance or recommend a good tolerance for this application?

  2. #2
    Join Date
    May 2004
    Posts
    4519
    From Machinery Handbook:
    Attached Thumbnails Attached Thumbnails THREAD_CHART.JPG  

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