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Old December 17th, 2009, 09:13 PM   #1
rodderdan
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Default Bastard bolt size

The rear bumper is loose on the Thing pass side.Found one bolt loose and the other broke off.The loose one won't tighten.It goes into a captive nut in a boxed in area.Thought the captive nut had broken loose.Turns out the nut was stripped.It's a 10mm X 150.Looked in my taps and the next size is 11mm x 150.Drilled it out and tapped to 11mm.Went to get 11mm bolt,can't find one anywhere including a bolt and nut supplier. 10mm yes 12 mm yes.11mm no way.Motor cycle shops said I'd I'd need to know the year and model of the bike that bolt was for.Found that 7/16 and 11mm are both .375 on the decimal equivilent chart.Re-tapped to 7/16 x 14, threads are close enough to recut.Hope they hold or I'll have to go to 12mm.Why do they include an 11mm tap and die in a set if you can't get the bolt.I would have made it 12mm if I had known.
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Old December 17th, 2009, 10:30 PM   #2
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Default Re: Bastard bolt size

well. if you end up with any more odd ball stuff like that i can get the 11mm bolts youd need no problem. just pm me. i just need the length youd need.
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Old December 17th, 2009, 10:35 PM   #3
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Default Re: Bastard bolt size

looked it up. most places dont have it listed anywhere. its not even in my catalog for work that i have on hand. but i did find a few under the JIS (japanese import standard), so it has a smaller wrench size.
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Old December 18th, 2009, 03:19 AM   #4
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Default Re: Bastard bolt size

I think you should throw in the towel on the thing, you'll never find that bolt. Better give it to me!

If they didn't include an 11mm and went from 10 to 12, 9 out of 10 would probably bitch that ther is no 11!
Crap like that will piss you off though, and it's probably the only bolt on the entire car like that too.


I tackle things like that the same way as wood. Measure 2, cut once. Find the bolt first, then tap
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Last edited by HeidelbergJohn4.0; December 18th, 2009 at 03:22 AM.
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Old December 18th, 2009, 07:31 AM   #5
ClassicGMJunkie
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Default Re: Bastard bolt size

i got the same problem with my impala rear end & panhard rod hardware. fine thread and big like 3/4" ... finger tight didnt last driving the only 5 blocks since i have had it, and lost a few nuts... walked 3 trips to look for them,. didnt find any. total bullshit man!!!
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Old December 18th, 2009, 08:21 AM   #6
rodderdan
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Default Re: Bastard bolt size

Ran a 7/16 x 14 tap thru the 11mm x 150 hole.Seems fine but I haven't put much torque on it and don't plan to.Just snug it up with a lock washer.If you ever have a stripped 10mm take it out to 12mm and save a lot of bullshit work or tap it for a 7/16.
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Old December 18th, 2009, 12:55 PM   #7
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Default Re: Bastard bolt size

Hey Dan, the next time you are in a fix for something like this, try:
Maryland Metrics
6119 Oakleaf Avenue
Baltimore, MD 21215
(410) 358-3130

They are over off Reisterstown Rd just north of Northern parkway. If they can't get it, it probably dosn't exsist.

In that case, you could always have someone with a lathe make you one.
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Old December 18th, 2009, 09:27 PM   #8
rodderdan
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Default Re: Bastard bolt size

Quote:
Originally Posted by drscope View Post
Hey Dan, the next time you are in a fix for something like this, try:
Maryland Metrics
6119 Oakleaf Avenue
Baltimore, MD 21215
(410) 358-3130

They are over off Reisterstown Rd just north of Northern parkway. If they can't get it, it probably dosn't exsist.

In that case, you could always have someone with a lathe make you one.
Thanks for the info.A friend told me there was a place on Reisterstown Rd. but didn't know the name.Re-tapping it is no big deal.I would have made it 12mm if I knew 11mm was so hard to find.I posted this mainly to help others not make the same mistake.
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