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    I have some old taps that are marked 3/16-24 and 3/16-32. Are thest equivalent to some number sizes? They look close to the numbers 10 and 12

  • #2
    conlo,
    No, they are for UNF & UNEF threads, and should be marked UF & UEF. 3/8 - 16 is Coarse (UNC) 3/8 - 24 fine, and 3/8 - 32 extra fine. See the link below.
    Ed


    http://www.simpsonenterprises.biz/te...fied_ring.html
    Ed Pacenka

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    • #3
      3/16 24 and 3/16 32 are NS taps but very close to 10/24 and 10/32
      3/16 O.D. is .187"
      #10 O.D. is .190"

      ------------------
      Doug
      Doug

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      • #4
        Conlo,
        Both of these taps are British. The 3/16 - 32 is a BSF and the 3/16 - 24 is a BSW.

        The finer thread (3/16 - 32) can also be found as a BSCy [British Standard Cycle] but I do not see the coarser size listed in BSCy.

        The 3/16 - 32 BSF has an OD of .188 and uses a 5/32 drill size - low engagement drill size #20 and a clearance drill size of #10.

        The 3/16 - 24 BSW has an OD of .188 and uses #27, #24, & #11 drills respectively.

        The 3/16 - 32 BSCy has an OD of .188 and the only 2 drill sizes I can locate are tap drill #20 and clearance drill #9.

        Given this information, you can compare with the 10-32 and 10-24 UF & UNC but for exact fits use the British values.

        Comparison values are also given in metric and may get you closer.
        Jim

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