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
--------------------------------
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,
.
.
.
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@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
--------------------------------
Bob Spidell - San Jose, CA
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