The BIRNS Millennium 3F size is perfect for very small size requirements. It is available with 1 contact, rated Class A to 4,000m (5,900 PSI). See photographic examples.

Now Here: the 3F fiber-optic connector! Only Ø19mm (Ø.75"), available in single-mode or multi-mode versions with <0.3dB typical contact loss. Testing IAW ANSI/TIA/EIA-455; all BIRNS optical technicans are ETA-I certified. Rated Class A to 3,000m (3,000 PSI).
Contacts

Contact Sizes (AWG)
Connector Prefixes
Receptacle Insert
Plug Insert
1

One 20 AWG contact

"3F-1-"
3F-RIP-1
3F-PIS-1
1

One optical fiber

"3F-H0100-"
N/A
N/A

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A 3F-C-CP coaxial Cable Plug terminated and overmolded to cable with flexible stainless steel external armor. A pencil shows scale.

Note: this miniaturized high-voltage coaxial connector is available only to Prime Contractors for bonafide USA Government orders.

(Right) A 3F fiber-optic connector pair. Only Ø19mm (Ø.75"), available in single-mode or multi-mode versions with <0.3dB typical contact loss. Testing IAW ANSI/TIA/EIA-455; all BIRNS optical technicans are ETA-I certified.

Note: in the photo a dime (Ø18mm, Ø.7") shows scale.