[Healeys] What Thread?

john harper ah100tech at gmail.com
Sun Dec 20 15:19:22 MST 2020


Harold

I believe that you will find that both should be BSF

On Sun, 20 Dec 2020 at 17:48, Harold Manifold <manifold at telus.net> wrote:

> 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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