What nut is this?

Does anyone know the AN or MS number of this type of nut and/or where to get them? Thanks.

They look like sealed nuts. .similar to these. https://images.app.goo.gl/9u9fmh8odkuhu6wt6
What are you using them for?
Google sealed anchor nuts and I found these. .similar. .https://www.google.com/search?clien...=sealed+anchor+nuts&aqs=mobile-gws-lite..0l1#

Search for acorn nut or cap nut. If you really think it's AN or MS, check with someplace like Genuine Aircraft Hardware https://www.gen-aircraft-hardware.com/

The Genuine Aircraft Hardware catalog p.56 calls it a Bubble Top Nut made by ESNA. Google F22NKM-02

I saw those. They appear to have a plastic “bubble”, the ones I’m looking for have a metal cap. They are definitely aircraft hardware. Brad

Rutan fan said:

I saw those. They appear to have a plastic “bubble”, the ones I’m looking for have a metal cap. They are definitely aircraft hardware. Brad

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They may be used on aircraft, somewhere (btw, where on your aircraft are you using these?), but I don't think they're AN (or MS) spec'd. How would they be properly torqued?

ETA: Well, I stand corrected.

http://everyspec.com/MS-Specs/MS2/MS24000-MS24999/MS24679E_40001/

MS24679E, MILITARY STANDARD: NUT, PLAIN, CAP, LOW CROWN, UNC-2B AND UNF-2B (15 MAR 1990) [SUPERSEDED BY A-A-55629]

MS24680F, MILITARY STANDARD: NUT, PLAIN, CAP, HIGH CROWN UNC-2B AND UNF-2B (15-MAR-1990) [S/S BY A-A-55628A]

ETA2: I see what they've done...they're no longer MS parts, just commercial parts...e.g., for the high crown nuts:

A-A-55628, COMMERCIAL ITEM DESCRIPTION: NUT, PLAIN, CAP, HIGH CROWN UNC-2B AND UNF-2B (03-DEC-1997) [SUPERSEDING MS24680F]
A-A-55628, COMMERCIAL ITEM DESCRIPTION: NUT, PLAIN, CAP, HIGH CROWN UNC-2B AND UNF-2B (03-DEC-1997) [SUPERSEDING MS24680F]., This Commercial Item Description (CID) depicts the requirements for Nut, Plain, Cap, High Crown, coarse or fine threads, Class 2..

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So there you go!

NAS hardware

These are NAS hardware, used on pressurized aircraft. "self-sealing", available as the nut shown, or in platenut. NAS 14xx series, I think....