The following is a picture of a locking pin for a tubular hinge which specifies Maritime use. I assume it has something to do with railings but I'm thinking of fabricating my own similar hinges. "Locking pin" seems awfully vague. I know I've seen this before; the little nub at the end is spring loaded and presses into the pin

enter image description here

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    $\begingroup$ Go to an agricultural machinery supplier - they have many... $\endgroup$ – Solar Mike Mar 25 at 14:09
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    $\begingroup$ a retaining pin, generally. "ring pin", or "ring pin with detent" should get good search results $\endgroup$ – Pete W Mar 25 at 14:26
  • $\begingroup$ This is also sometimes colloquially called a cotter pin, hitch pin, clevis pin or even pivot pin. But I kind of doubt you'll find it on a parts list under those names. $\endgroup$ – computercarguy Mar 25 at 23:13
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    $\begingroup$ A cotter pin is made from bent wire, that's pretty distinct IMO $\endgroup$ – Pete W Mar 26 at 3:54
  • $\begingroup$ The answer by @jko got it specifically -- one other name commonly used for this and similar shapes is a "pip pin" $\endgroup$ – Tristan Mar 26 at 16:27

That is a ring-grip quick-release pin, sometimes referred to as clevis pins. McMaster link

  • $\begingroup$ Yes! That's what I was looking for. Even a Google reverse photo search didn't find an answer. $\endgroup$ – Walter Mar 25 at 22:50
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    $\begingroup$ McMaster >>> Google $\endgroup$ – jko Mar 26 at 11:39

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