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  • countersunk screw angle

    what countersink (angle) do you use for which screw? tried searching. thank you, tom

  • #2
    Originally posted by pigpen60
    What countersink (angle) do you use for which screw?
    • The 82؛ angle is used for screws with countersunk heads.
    • 60؛ is used for lathe centers
    • 90؛ & 120؛ are used for drill centers


    .

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    • #3
      McMaster-Carr sells both 82 and 100 degree screws. I'm guessing 82 is more common?

      -Pete
      I just like to make stuff.

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      • #4
        American S A E is 82؛

        Metric is 90؛

        Some air craft stuff is 100؛
        Every Mans Work Is A Portrait of Him Self
        http://sites.google.com/site/machinistsite/TWO-BUDDIES
        http://s178.photobucket.com/user/lan...?sort=3&page=1

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        • #5
          Originally posted by EddyCurr
          • The 82؛ angle is used for screws with countersunk heads.
          • 60؛ is used for lathe centers
          • 90؛ & 120؛ are used for drill centers
          .
          • The 82؛ angle is used for screws with countersunk heads.
          The screws have "flat" heads and the 82deg is for US screws
          • 90؛ & 120؛ are used for drill centers
          The Metric Flat Head screws have 90deg angle . Don't know
          what a "drill center" is. 100deg flat head screws are common in
          the US for thinner materials, I've used them in the past.
          ...lew...

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          • #6
            thank you for quick and informative replies! pigpen

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            • #7
              Originally posted by Lew Hartswick
              Don't know what a "drill center" is.
              Spot drill might be the [much] more common term.

              .

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              • #8
                Counter sink

                The fluted countersink cutter is used to provide a heavy chamfer in the entrance to a drilled hole. This may be required to allow the correct seating for a countersunk-head screw or to provide the lead in for a second machining operation such as tapping. Countersink cutters are manufactured with six common angles, which are 60°, 82°, 90°, 100°, 110°, or 120°, with the two most common of those being 82° and 90°. Countersunk-head screws that follow the Unified Thread Standard very often have an 82° angle, and screws that follow the ISO standard very often have a 90° angle. Throughout the aerospace industry, countersunk fasteners typically have an angle of 100°. The ideal countersink angle for holes tapped with 60° threads, when no countersunk fastener head will sit in the countersunk area, is often 60°; but often another angle is used if that is the cutter that is at hand, and the difference usually doesn't matter.
                from:
                http://en.wikipedia.org/wiki/Countersink

                http://www.mechanicsupport.com/screw...ink_angle.html

                http://www.google.com.au/#hl=en&q=co...e49ba9ead933c3

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                • #9
                  Just got an 82 degree from enco in cobalt for $19.00
                  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                  Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

                  It is true, there is nothing free about freedom, don't be so quick to give it away.

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                  • #10
                    Taken from my Unbrako catalogue (high tensile fasteners, the best you can buy in my opinion), they call them "flat head screws":

                    90 degrees: Metric, B.A, BSW, BSF threads.

                    82 degrees: UNC, UNF threads

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