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Who knows the real ANSWER to this question????????

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BIG JOHN

01-01-2005 12:31:15




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I've always wondered about this. When working on these wonderful old tractors I keep running across bolts that will have one size bolt head and a larger size nut head. Such as a bolt with a 9/16" head with a nut with a 5/8" head.

When I have ask WHY THIS IS, locally I have gotten lots of different answers.

DOES ANYONE KNOW THE REAL ANSWER TO THIS QUESTION????? ?????




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Novel Idea Guy

01-02-2005 00:14:15




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 Re: Who knows the real ANSWER to this question???? in reply to BIG JOHN, 01-01-2005 12:31:15  
It's so you can loosen or tighten the bolt using one set of wrenches. Back in the days when tools were expensive and hard to get, a farmer only had one set of combination wrenches.If he had a bolt that needed two 9/16" wrenches, he would be absolutely screwed.



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lee

01-02-2005 06:16:37




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 Re: Who knows the real ANSWER to this question???? in reply to Novel Idea Guy, 01-02-2005 00:14:15  
they should have just used one size bolt across the board so the farmer only needed two of the same size wrench. Guy could buy 3 of the same size wrench and still be good to go if he lost one.



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mattd

01-01-2005 19:23:56




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 Re: Who knows the real ANSWER to this question???? in reply to BIG JOHN, 01-01-2005 12:31:15  
on irrigation wells the spicer shaft that goes from motor to well. the 4 bolts that connect the shaft on each end the bolt head are 5/8" and the nut is 11/16". they are a special hardened bolt that are pretty expensive. sorry this doesnt really answer your question



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lee

01-01-2005 18:38:41




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 Re: Who knows the real ANSWER to this question???? in reply to BIG JOHN, 01-01-2005 12:31:15  
these are typically called "heavy hex nuts" or "heavy duty hex nuts" as opposed to the more often seen "finished hex nuts" and the same applies to bolts. There are so many many different types and grades of bolts and nuts
made to different ASTM or other standards.
This site below seems to have a pretty good selection of all sorts of fasteners.

http://www.smithfast.com/inuts.htm



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RustyFarmall

01-01-2005 14:26:12




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 Re: Who knows the real ANSWER to this question???? in reply to BIG JOHN, 01-01-2005 12:31:15  
It's called a heavy duty nut, spreads the load out over a larger area for more secure fastening. You will find the same thing in several modern industrial applications.



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Farmer Bob

01-01-2005 12:53:35




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 Re: Who knows the real ANSWER to this question???? in reply to BIG JOHN, 01-01-2005 12:31:15  
Best info I've ever found is at the link below.



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CNKS

01-01-2005 13:19:58




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 Re: Who knows the real ANSWER to this question???? in reply to Farmer Bob, 01-01-2005 12:53:35  
That's a good site--Thanks, I bookmarked it. Don't know if it answers Big John's question or not, haven't read the whole site. As to the one wrench size, I have noticed the same difference in nut and bolt sizes on modern vehicles.



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Geoff NY

01-01-2005 12:43:00




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 Re: Who knows the real ANSWER to this question???? in reply to BIG JOHN, 01-01-2005 12:31:15  
A friend of mine who has been in the trade for years and was taught by an "old timer" says it was because the mechanics only had one wrench of each size. I am only 58 yrs. old and too young to know.



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