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<p>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.</p>
<p>Kees Oudesluijs</p>
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<div class="moz-cite-prefix">Op 5-6-2020 om 10:41 schreef Michael
MacLean:<br>
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<div dir="ltr" data-setdir="false">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?</div>
<div dir="ltr" data-setdir="false">Mike MacLean<br>
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