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countersunk screw angle

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  • Peter S
    replied
    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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  • Your Old Dog
    replied
    Just got an 82 degree from enco in cobalt for $19.00

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  • oldtiffie
    replied
    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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  • EddyCurr
    replied
    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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  • pigpen60
    replied
    thank you for quick and informative replies! pigpen

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  • Lew Hartswick
    replied
    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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  • lane
    replied
    American S A E is 82؛

    Metric is 90؛

    Some air craft stuff is 100؛

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

    -Pete

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  • EddyCurr
    replied
    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


    .

    Leave a comment:


  • pigpen60
    started a topic countersunk screw angle

    countersunk screw angle

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