What's one of these called?

[Bendy]

What do you call the little sprung clippy things that look like

O-

- a pin to go through a hole and a circle that is hinged and folds over to keep the pin in place.

Had them on the trailer to hold the ramp in for transit and I don't know the name so can't find them online.

[stinkwheel]

I usually call them something like "Ayafuckermybloodyfinger". Farmers call them "Whoselostthefuckingpinouttahere"

I think the proper name for them is a "lynch pin".
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[map]

Lynch pin
https://images.google.co.uk/images?q=tbn:cdMV8SLZyIQJ:4x4icon.com/offroad/disconnects/pin_right.jpg

Cotter pin
https://images.google.co.uk/images?q=tbn:4lO1KcRsty4J:www.yourdictionary.com/images/ahd/jpg/A4cotpin.jpg

Lock pin
https://images.google.co.uk/images?q=tbn:fYbAW9kKVCEJ:www.gwta-wa.org/Curve%2520Trailer/Trlr%2520lock%2520pin.JPG

HTH
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...and the whirlwind is in the thorn trees, it's hard for thee to kick against the pricks...
Gibbs, what did Duckie look like when he was younger?

[Ninja]

'R' clip
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James
4 wheels transport the Body ... 2 wheels transport the SOUL

[Bendy]

Lynch pin's the thing.

Thank you gentlemen.

[catgate]

Should you be successful in finding a lynch pin can I suggest you seriously consider Toady B liar, Blunket, Prescott, that weird Clarke man, Brown, Bush, and the whole of the current politically correct do-good brigade. They are all overdue for lynching!!!
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"Always remember you're unique, just like everyone else."