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

> What is the Nikon Z flange focal distance and throat diameter?

- Category: Cameras & lenses › Lens mounts & filter threads
- Kind: Standard part
- Basis: Published numbers only (sources per row); no bayonet geometry is published, so no file
- Page: https://xemstudio.com/objects/nikon-z-mount/ · JSON: https://xemstudio.com/api/geometry?object=nikon-z-mount · Plain text: https://xemstudio.com/objects/nikon-z-mount/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

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

## 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.

## Sizes

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

## Where the files are

- Nikon: [Nikon Z series: Z mount system (55 mm inner diameter, 16 mm flange focal distance)](https://www.nikonusa.com/learn-and-explore/c/products-and-innovation/nikon-z-series-z-mount-system) — web — Publisher's page; dimensions are facts
- Wikipedia: [Flange focal distance (table of mounts)](https://en.wikipedia.org/wiki/Flange_focal_distance) — web — CC BY-SA 4.0 (text); dimensions are facts

## 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.

## Fits with

- [Nikon F mount: 46.5 mm flange focal distance](https://xemstudio.com/objects/nikon-f-mount/)
- [Sony E-mount: 18 mm flange focal distance](https://xemstudio.com/objects/sony-e-mount/)
- [Canon RF mount: 20 mm flange focal distance, 54 mm diameter](https://xemstudio.com/objects/canon-rf-mount/)
- [Lens filter threads: M40.5 × 0.5 to M112, pitch table and thread rings](https://xemstudio.com/objects/lens-filter-threads/)