[Healeys] Fastener Curiosity

[Kees Oudesluijs]

Watch out. There are thread type's with the same TPI and but different 
top angle's of the thread, e.g. UNF/UNC 60º and Witworth 56º. They may 
seemingly fit but when you torque them down according spec you may strip 
the thread. The nuts may have different AF sizes.

Kees Oudesluijs



Op 5-6-2020 om 10:41 schreef Michael MacLean:
> Here is one for you Healey fastener buffs.  I installed the rocker 
> assembly to the BN2 engine tonight.  Before I started, I found that I 
> had two complete sets of studs, nuts and washers to install on the 
> head.  Finally getting to torque the pedestal nuts down I was 
> surprised to find two of the nuts were a different size than the other 
> six.  Let me back up a bit.  I was surprised to find BSF threaded nuts 
> with flats that fit a 9/16ths socket.  The two different nuts would 
> only fit a BSF/Whitworth socket.  So, I took out the other set of nuts 
> and washers and found they all fit the BSF/Whitworth socket.  In the 
> name of uniformity I used the BSF sized nuts on all the pedestal 
> studs.  Just seems kind of crazy a nut that only fit a 9/16ths socket 
> would have BSF threads.  What's up with that?
> Mike MacLean
>
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