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Old 06-28-2013, 06:22 PM   #1
happyclam OP
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need m12x380mm hex bolt

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.

happyclam screwed with this post 07-08-2013 at 05:50 PM Reason: ordered 400mm from metric tool
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Old 06-28-2013, 06:59 PM   #2
CRASHDADDY
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m12x320 bolt

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.
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Old 06-29-2013, 04:57 AM   #3
happyclam OP
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Quote:
Originally Posted by CRASHDADDY View Post
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.
thanks crashdaddy, I'll check it out...
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Old 06-29-2013, 05:45 AM   #4
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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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Old 06-29-2013, 07:14 AM   #5
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http://www.metricscrew-toolco.com/
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Old 06-29-2013, 08:06 AM   #6
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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.
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Old 06-29-2013, 09:20 AM   #7
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Quote:
Originally Posted by happyclam View Post
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.
Maybe some motorcycle axles might fit?
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Old 06-29-2013, 08:19 PM   #8
happyclam OP
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Originally Posted by concours View Post
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...

happyclam screwed with this post 06-29-2013 at 08:31 PM
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Old 06-29-2013, 09:17 PM   #9
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These guys have a 400mm bolt:

http://shop.schaefer-peters.com/DIN-931-A2-M-12X400

Unfortunately they are in Germany but maybe they have an American distributor.
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Old 06-29-2013, 09:21 PM   #10
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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.
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Old 06-30-2013, 04:23 AM   #11
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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.
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Old 06-30-2013, 08:27 AM   #12
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If threaded rod would work, ..........


I absolutely would NOT EVER use threaded rod as a motor mount bolt.
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Old 06-30-2013, 08:57 AM   #13
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"absolutely would NOT EVER" is a pretty broad term.
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Old 06-30-2013, 01:22 PM   #14
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A quick google showed this:

http://www.jackssmallengines.com/Par...366/2918777/pd

Calling Jack's small engine would be prudent before ordering. The other option is getting some M12 rod and making a stud by threading each end. Knowing the thread pitch is needed before making a 320mm long stud. Good luck!
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Old 06-30-2013, 02:57 PM   #15
happyclam OP
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Quote:
Originally Posted by JonnyCash View Post
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.
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.
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