[Healeys] What Thread?

[Harold Manifold]

Michael,
 
After learning from several of my mistakes when I mismatched fasteners on my
1960 BT7 I always measure twice and assemble once. I have an original of the
part in the picture. The big end is 20 TPI with a major diameter that
matches a 7/16 UNF. A 7/16 - 20 UNF nut fits. The small end is 24 TPI and
the closest major diameter would be a 3/8 UNF but the diameter is undersized
however a 3/8 - 24 UNF nut does fit.
 
To help identify the tread type I measure the TPI and the major diameter and
the go to this website to see what fits. Knowing the tread pitch helps to
narrow down the possibilities.
 
https://www.ring-plug-thread-gages.com/ti-thread-data-charts.html
 
I trust this helps.... Harold
 
 

  _____  

From: Healeys [mailto:healeys-bounces at autox.team.net] On Behalf Of Kees
Oudesluijs
Sent: Sunday, December 20, 2020 2:50 AM
To: healeys at autox.team.net
Subject: Re: [Healeys] What Thread?



If UNF7/16 is just to large it may be metric, probably M10. In that case the
stud's outside diameter should be just shy of 10,0mm or at most 10,0mm when
it is shoddily cut.

Kees Oudesluijs




Op 20-12-2020 om 11:12 schreef john harper:


Mike 

Both treads should be BSF. The problem is that not enough attention is given
to detail. Suppliers cannot bother to get things correct but they know they
have used an incorrect thread or otherwise, they would not have supplied the
nuts. The treads are most likely metric.

Rgds

On Sun, 20 Dec 2020 at 09:19, Michael MacLean <rrengineer.mike at att.net>
wrote:


The threaded pillar in the picture was purchased from Ahead4Healeys.  This
is the pillar for the generator adjusting bracket.  It came without the nuts
needed for the ends.  I can't figure out what type of threads these are.  I
bought a 1/2" BSF nut and a 7/16 BSF nut for it.  Problem is both of those
nuts are too loose.  When I try to tighten the large thread on the front
engine plate it will not tighten up.  It gets almost tight then pops loose
and spins.  The threads on the pillar are not damaged, so it must be the
wrong nut.  Same for the other end.  A UNF nut will not go more than a
couple of turns then stops.  I even tried running a metric die over the
threads and no dice.  I am confused. 
Mike MacLean 





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