Its a what ???????

Bought a mixed bag of old and dusty BA screws etc. at a country fair today. Amongst them was a small box of these unusual looking things. I’m curious as to what they are for as I’ve never seen anything like them before.

Overall length is 7/8”, thread size is 6BA, and both plain ends are .077” diameter. The hexagonal part is part of the body – not a nut. It is not attracted by a magnet. It looks as though it is plated and has a pale gold appearance. It does not feel heavy enough to be brass or stainless but has the weight of maybe aluminium or titanium, perhaps even magnesium? I might get the brazing torch out tonight and see if I can get one to light up the garden.

If I were a gambling man I’d put my money on aircraft related – what do you reckon?

Rik

I'd go with aircraft related, probably titanium.

George.

It's a left handed gruntle screw.

I sold a big bag of them today at a country fair and Ill bet the guy who bought them, because he was facing me though they were RH gruntle screws ?

I also would go with aviation, no idea of function though.

That's a clever bit of moderating

mike

Did I mention that the bloke I bought them from looked like a right dodgy geezer!

Rik

Edited By Rik Shaw on 27/08/2016 20:08:49

Ah, the 6 Ba Rockel Pin. Much sought after, but of little use ??

Seriously it's some form of pivot pin, I see a lot of these but not the same as the one in the picture on electric motors to hold the brush springs.

Chances are it could be anything but not much chance any anyone saying for certain that it came off a 1937 phumph.

Thanks for taking in the method it was intended.

The finish is probably aluchrom.

I've made similar (small) threaded pins for removing knock in rivets, used to fix identity and information plates to machine tools. In many cases the hole is drilled right through but there is insufficient space to get a punch and hammer behind the rivet. The threaded pin and a suitable size long nut does the job nicely. Not saying that is what they are but the resemblance to the items I made is remarkable.

Dave

self sealing stem bolt ?

Imagine it is fitted to a bar, you get a pair of well-aligned pins sticking out both sides to mount something on.

Try and think of a simpler way to fit a replaceable pivot to a relatively thin structure without having to make a precision hole.

"self sealing stem bolt"

I'm sure Quark had a job lot to get rid of.

It is looks like a locating pin. There are pins used in jigs by tool makers very similar to it.

Does the 6BA thread give any clue? Doesn't strike me as cars or aeroplanes.

Steve

Earthing "solder tag?"

Frank

I've come accros similar, in junk boxes of items at sales, so prolly quite common. I have no idea of actual use, but agricultural sales were the ones I usually frequented.

Maybe they plant them and sell the surplus!