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  1. #1
    Join Date
    Apr 2006
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    Brookfield, Brisbane
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    Default how to tell the thread of a bolt.

    i have a planining head i need to find out the thread of the spindle on it.

    can i measure it and work it out?

    i dont even know wheather it is imperail or metric.

    here are the measurements.

    11mm diamiter, 6 threads on the 8mm of thread thats there.

    can i work it out form that or is it a mater of going down to the hardware and finding a bolt that fits?

    www.carlweiss.com.au
    Mobile Sawmilling & Logging Service
    8" & 10" Lucas Mills, bobcat, 4wd tractor, 12 ton dozer, stihl saws.

  2. #2
    Join Date
    Jun 2007
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    North Of The Boarder
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    Default

    Buy a thread gauge Carl

  3. #3
    Join Date
    Apr 2006
    Location
    Brookfield, Brisbane
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    Default

    where would i buy one of them and what is it?

    www.carlweiss.com.au
    Mobile Sawmilling & Logging Service
    8" & 10" Lucas Mills, bobcat, 4wd tractor, 12 ton dozer, stihl saws.

  4. #4
    Join Date
    Jun 2006
    Location
    East Warburton, Vic
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    54
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    3,538

    Default

    Sounds like it's a 7/16" UNF thread
    Cheers

    DJ


    ADMIN

  5. #5
    Join Date
    Apr 2006
    Location
    Brookfield, Brisbane
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    Default

    id say its

    7/16" - 20 UNF

    diamiter - 11,112 mm
    pitch - 1,270mm

    after some extra carefull measuring wiht my calipers.

    my measurements came out to 11mm diamiter and 6 threads over 7.5mm (1.25mm pitch)

    thanks dj

    www.carlweiss.com.au
    Mobile Sawmilling & Logging Service
    8" & 10" Lucas Mills, bobcat, 4wd tractor, 12 ton dozer, stihl saws.

  6. #6
    Join Date
    Nov 2008
    Location
    Sydney
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    Default

    Quote Originally Posted by weisyboy View Post
    where would i buy one of them and what is it?
    A thread gauge is set of gauges with different thread pitches on them. They look similar to a set of feeler gauges. You would need a set for each type of thread, metric, UNC, UNF, etc. etc. There are combination sets that do some of the most common sizes. They have a variety of thread pitches on them. You open them up, put the gauge against the screw until you find the one that fits neatly in the screws thread. This will tell you what type of thread, and the pitch (Threads Per Inch), then you need to measure the diameter of the screw to determine its size. Simple hey! Certainly easier to show someone than describe the process!
    Here is a link to one
    http://www2.blackwoods.com.au/infoBA...4687&P=2028553

    Might be easier to go to a fastener specialist and get them to check for you, and tell you exactly what it is. There are a few odd screws out there that will fit each other, but not usually very secure.

  7. #7
    rrich Guest

    Default

    Just go to the hardware store and the hardware bins. Find a nut that fits. Not the bin that the nut came from and it should tell you the size and thread pitch.


  8. #8
    Join Date
    Oct 2007
    Location
    Alexandra Vic
    Age
    69
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    Default

    Many of the Oz hardware stores have nuts and bolts in bins etc, but often they get badly mixed by people who look at parts but don't replace in the correct bin.Some store staff couldn't tell A from B either and put bits in the wrong bin when restocking.

    From the info, I run with the UNF suggestion, but make sure that it's not a left hand (reverse rotation) thread.

  9. #9
    Join Date
    Jul 2008
    Location
    Meadow Springs, WA
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    76
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    Default

    Quote Originally Posted by weisyboy View Post
    i have a planining head i need to find out the thread of the spindle on it.

    can i measure it and work it out?

    i dont even know wheather it is imperail or metric.

    here are the measurements.

    11mm diamiter, 6 threads on the 8mm of thread thats there.

    can i work it out form that or is it a mater of going down to the hardware and finding a bolt that fits?
    Take it down to the nuts and bolts dept in your local Bunny, and see what it fits. Here, they have bolts mounted sticking out to test your nuts, and holes to test your bolts.

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