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Ford Tractors Discussion Forum
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Help needed identifying thread

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Bob Unitt

05-09-2006 01:06:09




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I have a threaded hole which is 7/8" in diameter and threaded 9 TPI. Looking at various tables leads me to believe it's either Whitworth or UNC. A UNC tap will go in, but I don't have a Whitworth tap to try.

The tractor is a 1966(?) UK-built Ford 3000; the hole is at the side of the front of the bell-housing, and its bolt holds the frame in place for the front-end loader.

My questions are :-

1) Will a 7/8" UNC tap screw easily into a 7/8" Whitworth thread ?

2) If so, how else can I work-out which thread it is ?

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RodInNS

05-09-2006 18:12:14




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 Re: Help needed identifying thread in reply to Bob Unitt, 05-09-2006 01:06:09  
Generally, any fastners you will find on that tractor will be either UNC or UNF thread. There are exceptions, but the rest would be 99% UNC/UNF.

Rod



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Bob Unitt

05-09-2006 15:13:10




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 Re: Help needed identifying thread - now resolved in reply to Bob Unitt, 05-09-2006 01:06:09  
Thank you for your comments and suggestions. I've now made a bolt which works - I first screwcut it with a 55 degree tool and, when that was too tight, went over it again with a 60 degree tool instead - giving a bolt that fits a bit loosely, but well enough for the job it has to do.



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sotxbill

05-09-2006 13:01:42




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 Re: Help needed identifying thread in reply to Bob Unitt, 05-09-2006 01:06:09  
always used the unc and it worked fine...



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Joe(TX)

05-09-2006 05:38:06




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 Re: Help needed identifying thread in reply to Bob Unitt, 05-09-2006 01:06:09  
7/8-9 UNC bolt has a 60 degree thread angle and a whitworth has a 55 deg angle. Take a 49/65 (.7656) drill and see if it slips into the hole easily. A Whitworth takes a .7579 tap drill.
You could run the tap drill for a unc bolt in and retap the hole for the unc threads.



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gerard

05-09-2006 16:59:44




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 Re: Help needed identifying thread in reply to Joe(TX), 05-09-2006 05:38:06  
With only a couple of thou difference between tapping drill sizes, doubt you'll identify the thread that way. However, Whit / BSF was phased out long before mid 60's, so it's highly unlikely your thread is other than UNC.



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