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bolt grade difference?

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Mike CA

03-17-2008 18:05:51




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I went to buy bolts for my wheels. I figured I'd get Grade 8, knowing they are stronger, but they didn't have my size. They did in Grade 5. Will that be ok for wheels? If that's ok, what about standard steel bolts, which are cheaper?




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rustyfarmall

03-18-2008 08:13:10




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
Mike, the grade 5 will be just fine on an H, especially when you consider how you will be using the tractor. Use the grade 5s and don't worry about it.

For what it's worth, the correct size and length of bolt, with the correct length to the threads, will be found only at a machinery dealer. Not likely you will ever find them at a common hardware store.



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Mike CA

03-18-2008 07:50:17




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  

F-Dean said: What do you mean they did not have grade 8 bolts? I bought grade 8 bolts and cut the threads further to make them the right size on my M.


They had 2 inch and 3 inch. I need 2 1/2 inch. I have no way of cutting them at home, and am not keen on trying to cut bolts right now.
If Grade 5 will work fine, then Grade 5 it is.

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F-Dean

03-18-2008 03:15:58




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
What do you mean they did not have grade 8 bolts? I bought grade 8 bolts and cut the threads further to make them the right size on my M.



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Mike CA

03-17-2008 22:55:15




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  

SuperA-Tx said: You might also consider a heavy duty nut on those bolts. Fastenal carries them.
The grade 8 nut and the grade 5 nut are the same price, so I was going to get the 8, with a grade 5 bolt and lock washer.



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SuperA-Tx

03-18-2008 05:55:46




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 22:55:15  
Heavy duty nuts are differant from the grade of metal. The wall of the nut is thicker than a standard nut. Takes the next larger socket size than what a standard nut would take.

I know on Super A's the rear wheels had them. I ran into this when I did my restoration and the right wheel nuts took a bigger socket than the left but they were the same size bolts. I suspect someone had replaced the nuts on the left with standard nuts because you could tell they were newer.

Fastenal got them for me.

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mkirsch

03-18-2008 05:51:20




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 22:55:15  
Mike, there's no point in using Grade 8 nuts if you're only using Grade 5 bolts. It's the thread that fails, not the nut, and the thread's only as strong as the weakest metal in the thread. You're spending an extra dollar per pound for no benefit.



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SuperA-Tx

03-17-2008 19:27:10




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
You might also consider a heavy duty nut on those bolts. Fastenal carries them.



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Haas

03-17-2008 19:12:32




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
The Grade 5 bolts should be fine. Make sure they are good and tight, as many bolt failures are due to loose bolts. Don't use what you call "standard steel bolts" which would usually be grade 2 or even grade 0. These cheaper bolts are much weaker and not suitable for use as wheel bolts or most anywhere else in machinery applications.



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Glenn F.

03-17-2008 18:26:48




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
If you snug those 5's up good 'n tight you will have no problems.

Glenn F.



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CNKS

03-17-2008 18:14:48




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
I have grade 5 rim bolts on my C and SH rear rims, should probably have 8's on the SH, but don't anticipate a problem. The 5's are cadmium plated, I prefer not to paint the bolts, although IH did. The 8's are a gold color. I would use 8's on the axle clamps, although it is usually the clamp that breaks, not the bolt. I don't know what you mean by "standard" steel bolts -- 5's have 3 hash marks on the head, 8's have 5, if the ones you call standard have no markings don't use them anywhere where there is a lot of stress, they will break easily. They are fine for non-structural components.

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GeneMO

03-17-2008 18:12:51




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 Re: bolt grade difference? in reply to Mike CA, 03-17-2008 18:05:51  
Dont worry about cheaper when it comes to wheel bolts. I would imagine the grade 5 would be OK. If you have a Caterpillar dealer near you, check out their prices. I have found they are not out of reason. I love Cat bolts! Our local dealer has a real good selection. I guess not historically accurate but I am not of that perfectionist mode.

Gene



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