On Tue, 20 Aug 2019 19:05:20 -0700 (PDT), Chalo
wrote:

Tom Kunich wrote:

By the way - It is NOT a "cap screw". It is as I said, and Internal
Wrenching Bolt. Now they are often mislabeled and you'd find a Cap
Screw in the wrong bin.

I had to look up your laughable term to see if anybody else
had heard of it. It turns out that an "internal wrenching bolt" is a
Jim Crow-era NAS (US aviation industry) designation for a certain kind
of cadmium-plated fastener which is by definition not metric. While
the decorative head on a craptastic linear-pull brake cable fixing
screw is superficially kind of similar, it's not an inch-sized,
cadmium-plated, ludicrously expensive airplane part. So it's not what
you say it is.

But feel free to keep doubling down.


Nope. The "NAS" number has changed but the same old bolt is still
available. A NAS 147-53 is now called a MS25007-40

The AN- Army Navy specification series started in the early 1940s
NAS- National Aerospace Standards, started in 1941
MS- Military standard started around the 1950s

--

Cheers,

John B.