need m12x320mm hex bolt

Discussion in 'The Garage' started by happyclam, Jun 28, 2013.

  1. happyclam

    happyclam Been here awhile

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    Tried searching on the web, with no luck. It's a long engine bolt I need to extend to accomadate crash bars for a wee strom? Any Help appreciated. Thanks, Jeff.
    #1
  2. CRASHDADDY

    CRASHDADDY Adventurer

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    For something that long i would consider buying a piece of threaded rod, cut it to length and put a nut on each end. McMaster-Carr sells a GRADE B7, by the meter, this is good quality chrome-moly with a high tensile strength. This is NOT the soft crap they sell in the hardware store. The other option is to get a machinist to thread both ends of a piece of 12mm rod cut to your desired length. That is the route i would go and i would use some material with a good tensile strength.
    #2
  3. happyclam

    happyclam Been here awhile

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    thanks crashdaddy, I'll check it out...
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  4. beemerphile

    beemerphile Long timer

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    I wonder if the rear mounting stud for a BMW airhead bike would be the same. I remember them as 12mm x 327 but I am often mistaken. If so, they are usually available cheaply from dismantlers.
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  5. concours

    concours WFO for 41 years

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  6. Yamarocket630

    Yamarocket630 Honey Badger

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    With a fastener that long just make sure it won't experience side or shearing loads. If so i would go with a larger diameter.
    #6
  7. Skippii

    Skippii Milkshakes, my lad.

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    Maybe some motorcycle axles might fit?
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  8. happyclam

    happyclam Been here awhile

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    Checked the web site, nothing that long...But i have 3 companies to call on monday...the search continues. I also need other hardware, i think, might come easier....or maybe i'lll just sell the bars as is and buy some new ones and go ride.. Thanks for the pointers everybody. My mistake the bolt nedds to be 380mm, sorry typo error in the late night...
    #8
  9. GreaseMonkey

    GreaseMonkey Preshrunk & Cottony

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  10. GreaseMonkey

    GreaseMonkey Preshrunk & Cottony

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    If threaded rod would work, a meter of it is $7:

    http://www.zorotools.com/g/00093447/k-G3691992?utm_source=google_shopping&utm_medium=cpc&utm_campaign=Google_Shopping_Feed&kw={keyword}&gclid=CKn7utT2irgCFRSVMgodEg8AYQ

    Edited to add that Crashdaddy already found a higher grade threaded rod.
    #10
  11. JonnyCash

    JonnyCash turd polisher

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    I have a bunch of BMW engine mount bolts. I'll measure one up, and let you know.


    Edit: I found it. It is 327mm long, with about 20mm of threads on each end. If you'll send me $5 for shipping, I'll send it your way.
    #11
  12. rufus

    rufus We're burning daylight...

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    I absolutely would NOT EVER use threaded rod as a motor mount bolt.
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  13. GreaseMonkey

    GreaseMonkey Preshrunk & Cottony

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    "absolutely would NOT EVER" is a pretty broad term.
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  14. Stan_R80/7

    Stan_R80/7 Beastly Gnarly

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  15. happyclam

    happyclam Been here awhile

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    I would but i need 380mm long, i had typed wrong the 1st time at 320mm. Thanks anyway. I think the rod is the way to go. I'll make some calls tomorrow to see whats available..Thanks again everybody.
    #15
  16. lavrider

    lavrider Adventurer

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    http://www.metricmcc.com/

    10 minutes from my work. They often have a little bit of an attitude for 1,2,3 piece orders. If they have something that would work, I could pick it up and drop it in the mail for ya.

    If you can find something in their online catalog and get a part number it may be better that calling out of the blue.
    #16
  17. happyclam

    happyclam Been here awhile

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    Thanks Lavrider, nice offer. I'll do some research. Called 2 bolt companies today with no luck. Threaded rod may be only option unless i go overseas, at which point i may just order the crash bars i really wanted anyway., but I'm not giving up yet.....
    #17
  18. sailah

    sailah Lampin' it

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    why?
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  19. happyclam

    happyclam Been here awhile

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    Finally found a 400mm @ metric tool & supply,(thanks for the lead), however it was the black type with high tensle strength but no anti-corrosive qualities. A few companies have stainless all thread but the tensle strength is questionable,(it seems). The zinc plated alloy all thread nobody carries, but can be ordered,(2-4 weeks). I think that's what most strong bolts are made of, and what I probably need. I can't remember if I can order the bolts directly from over seas, ( it may have been to long of a lead time/ too expensive?) Anyway, question is... Will stainless allthread be strong enough for a main engine bolt? It goes between the 2 cylinders that seem to hang from it as it attaches to the frame.V-twin 650 strom, if it helps to visualize. Did I mention the bolt probably gets pretty hot.......Anybody need any crash bars?:poser
    #19
  20. beemerphile

    beemerphile Long timer

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    It will not be as strong. No-one can tell you if it will be strong enough. You also introduce the potential for thread galling. If it were mine, I'd rather have cad or zinc, but I'd do the black oxide high strength item over the stainless one. A light coating of anti-sieze might be sufficient to assure that corrosion does not get to the threads.
    #20