Nikon Z mount: 16 mm flange focal distance, 55 mm inner diameter — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/nikon-z-mount/  (sheet CC BY 4.0)
Basis: Published numbers only (sources per row); no bayonet geometry is published, so no file
Catalog version: 2026-10-20

Sizes: see table below
- 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.

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Nikon: Nikon Z series: Z mount system (55 mm inner diameter, 16 mm flange focal distance) — web — Publisher's page; dimensions are facts — https://www.nikonusa.com/learn-and-explore/c/products-and-innovation/nikon-z-series-z-mount-system
- Wikipedia: Flange focal distance (table of mounts) — web — CC BY-SA 4.0 (text); dimensions are facts — https://en.wikipedia.org/wiki/Flange_focal_distance

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=nikon-z-mount