[Healeys] Reamers

[Bob Spidell]

Curt, 

I defer to your experience and knowledge; however, that's what happened to us. The U-bolts were previously untouched as far as we could tell, but when we tried to thread an SAE fine nut the nut jammed between about 3/4" down the thread--yes, we cleaned the threads first, and used new nuts--and when we thread-chased the U-bolt the die jammed in the same locations (both nuts and die ran up fine until then). 

I have no explanation, that's just what happened to us (can only surmise the TPI were slightly different). My dad wants to just double-nut the U-bolts--when he's not looking I'll replace them. 

bs 

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Bob Spidell - San Jose, CA 




Bob, 

Absolutely, positively, no doubt in my mind! UNF = SAE Fine and UNC = SAE Coarse. It was set up this way when the British transitioned away from the Whitworth Standard. Now, 
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And there's more, but I won't go into them since they'll really obscure the issue, but just remember, to be Whitworth they MUST have a 55 degree thread angle. 

Cheers, 

Curt 


On Mon, Nov 30, 2009 at 9:01 AM, Bob Spidell < bspidell at comcast.net > wrote: 




re: "*Unified Fine (UNF)* - Identical to American SAE Fine and *Interchangeable*. The angle of the threads is 60 degrees." 

Are you sure about this one? For instance, the threads on the large U-bolt that fastens the axle to rear springs is noted as 'UNF' in, for instance, the Moss catalog. I believe they are either 5/16" or 3/8." Anyway, we tried to run SAE fine nuts on them--they'll go about 3/4" inch just fine, then jam. A thread chaser will go 3/4", then cut, then go 3/4", then cut, etc. 

Same story with some of the nuts and bolts on the shock hardware. 

bs 

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Bob Spidell - San Jose, CA