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Thread: Thread sizes ...

  1. #1

    Thread sizes ...

    I'm looking in the PET manual and there is a pan head screw size listed as "A M 5 x 12"

    Does anyone know what the "A" denotes?

    Ben.

  2. #2
    Senior Member dirk07's Avatar
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  3. #3
    Senior Member uai's Avatar
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    This is quite common to german DIN designations. E.g. Washers DIN 125 A witout chamfer vs DIN 125 B which has a small chamfer.
    What Dirk referred to are counterbores according to DIN74 where the first character differntiates the shape (and therewith the type of screw) and the second the tolerance.

  4. #4
    Member #226 R Gruppe Life Member #147
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    Does the screw have a part number? I have a Porsche DIN booklet that converts part numbers. Gordon

  5. #5
    The part number is 900 014 058 02

    It's one of 5 pan head screws for the fuel sender collar - AM 5 X 12

    I actually need to tap one of the threads and was assuming 5mm thread width and 12mm length.

    Hoping there maybe additional info on the actual thread count or size ....

  6. #6
    Senior Member 9er's Avatar
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    Fuel sender collar 5x 0.8, length not so much of an issue.

  7. #7
    Thanks Chris - so 0.8 is what exactly?

  8. #8
    Quote Originally Posted by ELSPORTO View Post
    so 0.8 is what exactly?
    According to Chris, the thread pitch (P) is 0.8 mm.



    Jon B.
    Vista, CA

  9. #9
    Gotcha - thanks Jon B and all.

    Chris - where did you find the pitch info specific to that part? Just want to be 100% sure before I tap .... !

    Ben.

  10. #10
    Senior Member uai's Avatar
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    If there is no additional Info on pitch it's a standard metric.
    Fine threads have the added pitch info but pay attention as they are rarely use the abreviation MF (=Metric Fine) mostly it's just M<nominal-diameter>x<pitch> e.g. M12x1,5
    For more infos
    http://gewinde-normen.de/iso-regelgewinde.html

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