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  1. #1
    Join Date
    Aug 2006
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    Default Are there stronger bolts?

    Is there a stronger bolt I can use better than a grade 8? What does"AN" desigination mean?
    Nick
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  2. #2
    Join Date
    Jul 2007
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    Default

    Nick, we use a Grade 9 at work. The only trouble is, the grade 9 is more brittle than the grade 8 and it will break quicker, however the grade 9 does have more holding stength.
    Ken

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  3. #3
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    Default

    KBar........thanks for the comeback. How are they stronger? Shear load or enlongation(sp)or both............Nick
    Nick
    Miller 252 Mig
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  4. #4
    Join Date
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    Default

    Quote Originally Posted by monte55 View Post
    KBar........thanks for the comeback. How are they stronger? Shear load or enlongation(sp)or both............Nick
    I actually prefer the grade 8 over the grade 9 because of the shear strength, the grade 9 will snap quick with a sharp impact or sizable load against it. But because of technical & liability issues, we need to use the grade 9.
    Ken

    What else is there besides welding and riding. Besides that

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  5. #5
    Join Date
    Feb 2005
    Location
    N.E. SD
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    1,377

    Default

    FWIW, if you have trouble with bulk bin grade 8 bolts, take a trip to your local CAT dealer. They are known for quality fasteners.
    Jeff

  6. #6
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    948

    Default

    I am curious to know what hte application is. Generally if a grade 8 bolt can't handle the stress you need either more of them or a bigger diameter bolt.

  7. #7
    Join Date
    Nov 2008
    Location
    Atl, Ga
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    371

    Default

    AN is only available in fine thread. Grade 8 comes in coarse and fine.
    -Just something to think about.

  8. #8
    Join Date
    Feb 2008
    Location
    Western NY State
    Posts
    41

    Default Cap Screws

    Hi Guys!
    I think this is my first post but I read most of the comments. The reading is very interesting. Thanks to all you contributors!
    My Premier Fastener Handbook shows the following:
    SAE Grade 5 - three lines - 120,000 psi
    SAE Grade 8 - six lines - 150,000 psi
    Supertanium - special symbol - 160,000 psi
    The psi is tensile strength and shear strength is about 60% of the tensile strength.
    If you have a Machinery Handbook or similar reference it will have a section on fasteners but when you exceed grade 8 the data is usually from the manufacturer.
    Happy Holidays!

  9. #9
    Join Date
    Mar 2006
    Location
    Queens NY
    Posts
    1,547

    Default

    I would reference the AC43.13 manual for what the standards are (an,ms etc). Carol Smith has this book which i found useful ]

    http://www.amazon.com/Fasteners-Plum...9710031&sr=1-1
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  10. #10
    Join Date
    Dec 2008
    Location
    Virginia
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    4

    Default

    I always heard that "AN" meant Army-navy... which is a standardized style of hardware and fittings.

    Also I have seen and have used Grade 9 hardware. Typically its only in a clamping situation as Grade 8 works great in shear and in tension. Keep in mind the strength and hardness of the hardware vs. the hardness of the material you are bonding. What will fail first? Is that catastophic failure? In high fatigue areas you often want your hardware to have similar properties as your clamped materials. Unless the hardware is only acting as a friction causing clamping force.

    Also grade B7 has a fairly high yeild value but with more of an elastic range than that of the typical Grade 8 hardware...

    Its more in the application of the hardware than in the actual strength of the hardware. You'd be amazed at what you can put Grade 5 and 8 through if you spec it properly.

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