I can't for the life of me remember the names of those pins. They are a form of small rivet (brass or steel) used to attach metal plates to metal cases. Typical uses are rating plates on electric motors and frame numbers on motorcycles. They have mushroom heads and the shank is slightly serrated -- not so much a thread as a series of ridges. Once lightly hammered in to the appropriate size hole they stay put.

Page 1188 of my Machinery Handbook (& that's not even the middle.) reveals that the solid rivet is designated by its head. The "Pop Rivet" is also known as a blind rivet & was originally invented for aircraft panels in WWII. I use them up to 3/16"

The ones in radio chasses are normally a hollow type that are either spread by a dolly, or I think(?) a nut riveter.

Marc

The ones I'm after are used from the front only, in situations where there is no access from the rear. They bind within the solid body metal via their lightly serrated shafts. They are a pin rather than a pop rivet. A mate of mine uses them on old motorcycles and he would give me the name immediately, but he's travelling and incommunicado.

Picture a metal rating plate on an electric motor, with small pins in each corner.

Like a pin anchor, but without the centre pin.
A metal pin nail?
Will be interested to know what they are really called.

Got it: Hammer drive screws (which have coarse threads). Damn obvious name when I think about it. A case of "I vaguely recall the face but what's your name?"

GTC I know exactly what you mean. I used to fit nameplates to alternator cases with them.
They had a specific name when we used to buy them by the box from Blackwoods.
The only problem is I cannot remember what they were called!!
The were round head, brass and had a lazy knurl on the shaft.
They fitted I think a 1/8" drilled hole and you hammered them in either straight with a hammer or using a cupped pin punch.
I thought I would have remembered the name by now just talking about them....nope!
Fred.

Found in Wikipedia


Drive rivet
A drive rivet is a form of blind rivet that has a short mandrel protruding from the head that is driven in with a hammer to flare out the end inserted in the hole. This is commonly used to rivet wood panels into place since the hole does not need to be drilled all the way through the panel, producing an aesthetically pleasing appearance. They can also be used with plastic, metal, and other materials and require no special setting tool other than a hammer and possibly a backing block (steel or some other dense material) placed behind the location of the rivet while hammering it into place. Drive rivets have less clamping force than most other rivets. Drive screws, possibly another name for drive rivets, are commonly used to hold nameplates into blind holes. They typically have spiral threads that grip the side of the hole.

So at least this is what they may be called in the US of A.

As per post #5 we call them hammer drive screws:

https://www.bolt.com.au/stainless-steel-fasteners-hammer-drive-screws-c-1010_1588_1643.html