# Nikon F mount: 46.5 mm flange focal distance

> What is the Nikon F flange focal distance?

- 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-f-mount/ · JSON: https://xemstudio.com/api/geometry?object=nikon-f-mount · Plain text: https://xemstudio.com/objects/nikon-f-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.
- 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 | 46.50 mm | Flange focal distance table |
| throat / inner diameter | not published by the maker in a source I could verify (left out) | — |
| coupling | bayonet | — |

## Where the files are

- 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 F flange distance?**

46.50 mm.

## Fits with

- [Nikon Z mount: 16 mm flange focal distance, 55 mm inner diameter](https://xemstudio.com/objects/nikon-z-mount/)
- [Canon EF mount: 44 mm flange focal distance](https://xemstudio.com/objects/canon-ef-mount/)
- [M42 screw mount (M42 × 1): 45.46 mm flange, thread rings](https://xemstudio.com/objects/m42-screw-mount/)