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I've picking these things up of beach for years.
I have often wondered what they are used for are.
Thoughts, so far.
Plastic bung. Even though I have never see one in use anywhere.
Alien invasion.
Butt plugs for action man or barbie.
Contents of a container lost at sea in the 70's
Offcut by product manufactuer.
Captain Flotsam for scale.
I bet an STW expert will know for sure.
I’ve been cleaning beaches in Pembrokeshire for 20 years and I’ve never seen one of those, so I can’t help, sorry!
Which coastline are you finding them on?
I don't know how tall that plastic soldier is but those look like the bungs from BiC pens.
Severnside.Avonmouth to Aust is my patch.
Plastic soldier 1/32. 54mm. Also, found on the strandline.
They look like something to do with them blue plastic barrels you get like the ones they tied to Jaws, except, blue.

Or a hose bung maybe.
http://www.beachstuff.uk/plastics.html
More examples half way down the page.
Sometimes when you buy a part of a hydraulic system the inlet/outlet port has a little disposable plastic bung in it to keep it sealed until it is connected. They look like those, but the ones I remember were red..................
My first thought was hydraulics/fuel system/coolant for automotive, but as above, they're always red IME
They're two different things aren't they? One looks male to the other's female?
One looks male to the other’s female?
We don’t use gender labels anymore.
They’re pan-fitting
they aren't feet that go on something like one of those old cloth drying racks are they?
Perchy,at least we can still get Sex Bolts 😉

OP I think they look like pipe bungs to keep the inside clean during storage/transit
Those are Consensual Non-sexual Cuddle in the context of a non-specific relationship Bolts
submarined
Member
My first thought was hydraulics/fuel system/coolant for automotive, but as above, they’re always red IME
Red for liquid, blue for pneumatic? Pretty sure all the Festo caps are blue, but look a lot flimsier than that shown in the pic.
Annoyingly I'm pretty sure I've had [s]those same[/s] similar things before but can't think where from.
I want to say lids for glue etc in sqeezy bottles.
Nurdles? Raw materials for making plastic things.
I'm fairly sure they're blue plastic things.
Pen end bungs, like you see on Bic's?
Ultra-rare Searobin eggs. You monster.
Thrunge plugs.
Male/Female/pan
How about paracord buckles?

I'll sort out some better photos tomorrow.
Timeframe for finding these on patch. 1977 to present. I remember seeing shorter and differing colours. Nearly always blue and some reds.
Sex bolts ?!
I’ve been using those things for years to fit door handles, I thought they were called “F*** FIDDLY WEE B**** !!!”
F*** FIDDLY WEE B****
Sums up sex for some folk...
Nearly always blue and some reds
Metric/Imperial. Obviously.
Those are Consensual Non-sexual Cuddle in the context of a non-specific relationship Bolts
Congratulations to the man always ready with the quick quip!
More examples half way down the page.
The bungs on here get my vote. Also, very interesting site.
My guess is that they're bungs to go on the end of sticks, not into holes, probably during transit. When the sticks arrive at their destination, the bungs are discarded. But what kind of sticks??
Turtle poop 😣
BIC biro end plugs.
15mm height
13mm dia base, the 11.5mm and 11mm at top dia.
One is solid and other is bored out.
I reckon some sort of marine hydraulic/pipework bung and flung overboard.
It's the raw unrefined blue passport, they collect nearly 100 of them to forge a brave new passport to nowhere.
My entire battalion of Action Jacks went out with the tide, Skegness 1982. Gutted. They'll still be out there somewhere.

The blue things, pipe/valve plugs used offshore, fishing, or farming my guess, for the quantity they wash up in - either that or a container of them sank!
@bob_summers
I'll keep my eyes peeled for your "Action Jack" platoon.