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Thread sizes, nut sizes, spanner sizes and UNC/UNF TPI

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  • Thread sizes, nut sizes, spanner sizes and UNC/UNF TPI

    Not an exhaustive list and not Imp Specific but a quick reference
    BOLT / NUT SHANK / HOLE AF SPANNER SIZE METRIC SPANNER UNC (TPI) UNF (TPI)
    1/4 inch 7/16 inch 11.11 mm 20 28
    5/16 inch 1/2 inch 12.7 mm 18 24
    3/8 inch 9/16 inch 14.29 mm 16 24
    7/16 inch 5/8 inch 15.88 mm 14 20
    1/2 inch 3/4 inch 19.05* mm 13 20
    9/16 inch 7/8 inch 22.22 mm 12 18
    5/8 inch 15/16 inch 23.81 mm 11 18
    3/4 inch 1.1/8 inches 28.57 mm 10 16
    / John

    If it can be fixed with a hammer, I am your man

  • #2
    Thanks John, have printed this and put it up in the garage. Years of architectural design my brain only works in mm so need all the help I can with imperial!

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    • #3
      Thanks Dan

      You know how I feel then, my life revolves around microns and thou just too crude at those sizes and too many fractal places to slow things down, especially in 3D renders,, has done for as long as I have had imps !

      I was in airport thinking what can be useful that i can do in 10 minutes so I did the spanner / thread sizes one as the parts list refers to thread sizes, not spanner.

      Always use 6 point sockets rather than 12 is another good one as a lot of spanners sold as AF now are actually crap metric ones with new stamps !

      The engine bay qiring colour quick reference was another, i found some questions while looking to see what folks ask about the most, based on if it is asked often the answer is not clear !

      A few of those questions were from you on BRU, when you were demysifying BRUs wiring

      / John

      If it can be fixed with a hammer, I am your man

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      • #4
        Originally posted by John A. Ross View Post
        Thanks Dan

        A few of those questions were from you on BRU, when you were demysifying BRUs wiring
        Yep, pulled out two buckets of non originally wiring! Even a household light switch. Completely re-wired now, thank god.

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