This nut (pictured) fits the binder bolt from a vintage 3ttt stem. I would like to know the name of this nut, or the type of nut this is so that I can try to buy more.

stem binder bolt nut bottom stem binder bolt nut top

So far, I've found similar things when searching the internet with keywords like "knurled", "conical", and "tapered", but haven't managed to find anything that has the flange.

Can anyone help?

Edit: For clarification, here's a pic of the nut in situ

3ttt stem

  • 2
    I've never seen anything like it on a bike. Where exactly is it positioned? – Daniel R Hicks Apr 8 '18 at 0:42
  • I'd say a proprietary nut used by TTT. Most stems of that type used standard six-sided (lock) nuts in a six-sided recess. You could be lucky on a vintage parts market. – Carel Apr 8 '18 at 7:59
  • 1
    Just out of curiosity, what's wrong with the nut? (Or do you need a matching one for a different bike?) – Daniel R Hicks Apr 8 '18 at 12:39
  • It's the kind of thing that when it's gone amiss makes you throw away an otherwise perfect item. – Carel Apr 8 '18 at 16:34
  • A skilled lathe operator could mill one from either an oversized nut or a piece of steel stock. However it would not be cheap. Contact a local engineering firm - you'll need measurements and dimensions and thread specs, and possibly some hardness details. – Criggie Apr 8 '18 at 20:00

I've found something similar (only the other way round) for Cinelli: https://www.ebay.com/itm/Cinelli-1A-stem-clamp-serrated-section-fixing-bolt-and-nut/142719429884 and I was searching for "stem clamp serrated nut". This one has the flange.

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It's called a stem clamp binder nut. The names don't get more specific than that, unfortunately. You could search for the bolt by the stem name, and maybe get lucky finding another one. It's not a super-common setup for stems; they typically used a hex nut.

If it doesn't fit a little further into the stem, it's most likely an incorrect size for the stem. The flange should sit flush when the bolt is fully tightened. The binder bolt thread only comes in a few sizes, so you may just have a bolt that "works" but is not original to the stem.

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