Mystery hardware

[RedShirtGuy]

I don't suppose anyone can tell me what either of these thingies are for?

Both are roughly 1/4" in shaft size. The one on the left, with the thread, has three protruding "nipples" on the underside of the head, while the one on the right has no thread and its surfaces are completely smooth. There are no "holes" for a screw driver and both are smooth circles at the "head" so no spanner either.

They came out of a big mixed box of bolts and screws that a mate gave to me so I've got not context at all as to where they would have been used. I may have said that they were feet for something, but they're both pretty small, so I doubt it.

[PLD]

The first one, to me, looks like a drain plug for some machinery. I don't know but that would be my guess.

[stevogq]

Second looks very similar to a aircraft rivit

[artme]

Is the first one a mower blade bolt??

[RedShirtGuy]

Second looks very similar to a aircraft rivit

Bingo. It's called a stepped rivet.

Gold star for you . Thank you

Is the first one a mower blade bolt??

And another bingo. - Update: Filthy lies


I'll give PLD a silver star for effort and because that's what I was thinking too

[beer4all]

IMO, the one on the left is not a mower blade bolt. I believe "1/4 would be too small diameter wise. Most mower bolts are "7/16 or "3/8. It seems to me that the "nipples" would be for biting into a softer material to stop it turning when a nut is secured onto the thread. Possibly for wood and on an exterior surface ??

The one on the right does appear to be a rivet though.......

[RedShirtGuy]

Good catch beer. The mystery remains...

[beer4all]

Good catch beer. The mystery remains...

Further update...........appears to be a "Projection Weld Screw". Clamped to metal sheet, project etc. then current passed through to fuse or weld in place permanently........

[RedShirtGuy]

A-HA!!!

The first one is an elevator bolt. (Update: but also likely to be a projection weld screw - see post directly above and below)

A common application for elevator bolts is industrial or agricultural belting systems or conveyor systems, where head clearances must be minimal and where a wide thin bearing surface is desired.

The "nipples" (which are really called "fangs") are, as beer4all suggested, for biting into the soft surface of the belt to stop the bolt spinning. Other bolts might have a square neck instead of fangs for the same purpose.

Nice work Scooby gang




I'll have artme's gold star now.


....EWWW!!! It's wet!!!!

[RedShirtGuy]

Further update...........appears to be a "Projection Weld Screw".

Oooohhh...Yes, it does look like it could be called that too. I might even go so far as to say that given the small size of the fangs on it, you might be right.

I'll go you halves on the star

[stevogq]

Winner winner chicken dinner lol

[beer4all]

Oooohhh...Yes, it does look like it could be called that too. I might even go so far as to say that given the small size of the fangs on it, you might be right.

I'll go you halves on the star

Will I be the st...........or the ar..............?

[artme]

Dang!! Missed again!!

...and you can have your star!!!