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Restoration & Repair Tips Board

Wrench sizes

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Steve Gerot

11-29-2006 21:42:35




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Ive been tearing down my ole Oliver Hart-Parr and some of the bolt & nut heads seem to be in between regular sizes. I know they were not metric so what is the deal? Did they use sizes into 32nd's ? At 1st I thought they were just eroded but thats not the case , they are in fairly good shape.




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1936

12-09-2006 16:51:02




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 Re: Wrench sizes in reply to Steve Gerot, 11-29-2006 21:42:35  
Just looked in the 2006-07 craftsman tool catalog and they have the off sizes you maybe looking for. Sears.com/tools 800 377 7414.



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Steve Gerot

11-30-2006 12:44:45




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 Re: Wrench sizes in reply to Steve Gerot, 11-29-2006 21:42:35  
I have found several wrenches in 32nd incrments but havnt found any 13/32, 15/32 or 17/32.



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Rustyfarmall

11-30-2006 12:54:29




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 Re: Wrench sizes in reply to Steve Gerot, 11-30-2006 12:44:45  
For what it's worth, sometimes a metric wrench will fit those odd-ball sizes. It's worth a try. Another idea is to go out and buy a cheap wrench that is a little small and grind it out to fit.



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noncompos

11-30-2006 11:09:30




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 Re: Wrench sizes in reply to Steve Gerot, 11-29-2006 21:42:35  
I don"t know much (or anything) about O H-P history, but unless some were sold in England would tend to doubt the nuts were Whitworth, which was the name of the Brit system if memory serves. My own guess would be US 32nd"s or 64th"s.
And, if memory serves again, a sure test: screw on a modern size nut: if Brit Whitworth won"t go on because threads also different than US types.
All done, of course, to make sure all replacement parts had to come from original makers country, at least as much as possible.

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glennster

11-30-2006 07:25:51




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 Re: Wrench sizes in reply to Steve Gerot, 11-29-2006 21:42:35  
your probably running in to a 19/32 and a 25/32 head bolt. they were pretty common on the old machinery.



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Rustyfarmall

11-30-2006 06:16:54




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 Re: Wrench sizes in reply to Steve Gerot, 11-29-2006 21:42:35  
Let me see if I can explain what I was told once. We all know about the U.S. SAE standard sizes, and we know about the metric sizes, but at one time there was also the British standard, which was different. Some of the older equipment was made with fastener sizes that tried to be compatible with the british sizes, so we ended up with bolts and nuts that needed wrenches in 32nds and 64ths. Confusing and frustrating, but I think that is what you are dealing with.

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