On Wed, 21 Aug 2019 13:04:46 -0400, Frank Krygowski
wrote:

On 8/21/2019 11:39 AM, Tom Kunich wrote:
On Tuesday, August 20, 2019 at 7:05:22 PM UTC-7, 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.

You are perfectly welcome to invent any name you like for a common head shape. You can even tell everyone that because some have metric hex interiors instead of English size hex that it is a completely different head shape. Is there something wrong in your head for which you simply cannot agree on a commonly available part?

Tom, the point is: many of us are very familiar with bike hardware. Only
one of us seems to think we should call that thing an "internally
wrenching bolt." That's true whether or not you can find it on a page
devoted to aircraft hardware. Using that moniker is a failure to
communicate.

This reminds me of another tempest-in-a-teapot in the bicycling world.
Back in the 1980s, perhaps, some manufacturers organization tried to
change the words used for different types of bike tires. IIRC, they were
happy enough with "tubulars" but they said almost all "clinchers" didn't
really meet _their_ official definition of what a "clincher" tire was.

So they said the name "tubular" could remain, but the proper name for
what we call "clincher" was ... wait for it! ... "TIRE"!

We all know how well that effort worked out.

Many years ago I was working in the USAF Machine shop on a Sunday -
doing a "home project" - and a guy from the fire department came in
with an old rusty, maybe 3/8"-16 bolt, and says, "Can I give him one
like this except but with "skinny" threads?"

We spent some time with one idiot trying to explain to the other idiot
what a skinny thread was and the "penny finally dropped". I found him
a 3/8"-24 thread bolt in the junk box an he went away happy and I was
left to ponder on whether the whole "outside world" measured threads
as fat and skinny :-)
--

Cheers,

John B.