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Nikon Z mount: 16 mm flange focal distance, 55 mm inner diameter

What is the Nikon Z flange focal distance and throat diameter? · Standard part · basis: Published numbers only (sources per row); no bayonet geometry is published, so no file

Also called: nikon z flange distance, z mount inner diameter, nikon z mount dimensions, z mount 55mm, ftz adapter thickness

Exact dimensions. True size, with no printing tolerance added.

sizes: 3 in table

Notes

Flange focal distance is the distance from the mount's reference face to the image plane; adapters and extension tubes must add exactly the difference between two mounts' flange distances to keep infinity focus.
Nikon's own figures: 55 mm inner diameter, 16 mm flange focal distance.
No file: the bayonet's lug widths, angles, depths and locking geometry are not published by the maker, so nothing is drawn. Only the published numbers are given.

Nikon Z mount: 16 mm flange focal distance, 55 mm inner diameter size chart

parameter	value	from
flange focal distance	16 mm	Nikon
throat / inner diameter	55 mm (inner diameter)	Nikon
coupling	bayonet	—

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Nikon	Nikon Z series: Z mount system (55 mm inner diameter, 16 mm flange focal distance)	web	Publisher's page; dimensions are facts
Wikipedia	Flange focal distance (table of mounts)	web	CC BY-SA 4.0 (text); dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=nikon-z-mount

Schematic, not to scale.

Fits with

Free

Nikon F mount: 46.5 mm flange focal distance3 sizes★ sheet Free

Sony E-mount: 18 mm flange focal distance4 sizes★ sheet Free

Canon RF mount: 20 mm flange focal distance, 54 mm diameter3 sizes★ sheet Free

Lens filter threads: M40.5 × 0.5 to M112, pitch table and thread rings, isometric render of a generated part

Lens filter threads: M40.5 × 0.5 to M112, pitch table and thread rings17 sizes★ 28 files

Questions

What is the Nikon Z flange distance?

16 mm, with a 55 mm inner diameter (Nikon).

How thick is an F-to-Z adapter?

F is 46.50 mm and Z 16 mm, so an adapter adds 30.5 mm.