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  1. #1
    imp0ster's Avatar
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    Mechanical properties of Ti-6Al-4V vs class 8.8 grade 8 steel

    This is the hard proof and not guessing I was looking for when deciding to use Ti in place of 8.8 steel fasteners in the valvetrain. The same info can be found in NASAs findings. Shear strength is roughly 60-62% of the ultimate yield of a fastener. For this purpose I'll use 62%. Class 8.8 shear strength = 830Mpa * 62% = 514.6MPa vs Ti-6Al-4V shear strength of 550MPa. Every specification of the common Ti alloy 6Al-4V beats a 8.8 class grade 8 fastener

    Furthermore...

    Hi I have had to call our head office with your request and this is what they said

    "Our titanium bolts would be equivalent to 10.9 grade steel, so there would be no problem in switching to titanium."

    Cheers David


    David Cork
    Pro-Bolt USA
    [email protected]
    www.probolt-usa.com
    772-597-3208
    1-855-272-5682
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    Last edited by imp0ster; 01-10-2013 at 09:23 AM.


  2. #2

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    IF a TI fastener sheered off and is sub flush, how would you remove it?

  3. #3
    imp0ster's Avatar
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    You don't since it's so hard. What are the chances though? After reading this would you want to hang over a cliff with a Ti bolt holding you there, or a 8.8 bolt?

  4. #4

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    Quote Originally Posted by imp0ster View Post
    You don't since it's so hard. What are the chances though? After reading this would you want to hang over a cliff with a Ti bolt holding you there, or a 8.8 bolt?
    Are we comparing an 8.8 OEM Seadoo bolt that was used in 1000's of machines with up to a 5 year warrenty and a made in Tiawan ti fastener w/ no track history? I will take the proven OEM When I work on something, I look for common problems/concerns-- ceramic washers for instance. If there are no problems, I leave it alone and try to put it back together EXACTLY like I found it to have the SAME reliability.
    Last edited by jim; 01-10-2013 at 05:30 PM.

  5. #5
    GasResearch-VT.SE's Avatar
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    Isn't it history that when the SU-47 was built, thats when they used 'star' heads on the Ti bolts to indicate a Ti bolt? But now star is used on other bolt materials...


    Back on topic... Whats harder? Carbide tungsten drill bits or Ti bolts? I don't want to be finding out...

  6. #6
    Moderator beerdart's Avatar
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    I have drill thousands of ti screws out. Yes they are hard but with a cobalt bit its not that bad.

  7. #7
    Sayers's Avatar
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    Quote Originally Posted by imp0ster View Post
    You don't since it's so hard. What are the chances though? After reading this would you want to hang over a cliff with a Ti bolt holding you there, or a 8.8 bolt?
    I'd rather hang from the Ti bolt, but I'm not spinning at 8k plus and going through heat cycles with a dissimilar metal!?

  8. #8
    imp0ster's Avatar
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    Quote Originally Posted by Sayers View Post
    Quote Originally Posted by imp0ster View Post
    You don't since it's so hard. What are the chances though? After reading this would you want to hang over a cliff with a Ti bolt holding you there, or a 8.8 bolt?
    I'd rather hang from the Ti bolt, but I'm not spinning at 8k plus and going through heat cycles with a dissimilar metal!?
    They're in an loctited down. Guess I'll let you all know. Guna use the other to hold the fuel rail in since they also look pretty

  9. #9
    ncdoo's Avatar
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    Well someone has to be the guinea pig.

  10. #10
    imp0ster's Avatar
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    Quote Originally Posted by ncdoo View Post
    Well someone has to be the guinea pig.
    Every pioneer in this industry is my friend. I'd prefer to call myself a robo dwarf hamster though.

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