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Keyhole hanger slot

Name: Keyhole hanger slot dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What size is a keyhole slot for a screw? · Hardware · basis: Xem Studio design — geometry computed in the generator from traditional proportions

Also called: keyhole slot, keyhole hanger, keyhole slot dimensions, keyhole mount 3d print, keyhole hanger size, wall hanging keyhole, ranura de ojo de cerradura, colgador tipo ojo de cerradura, Schlüssellochaufhängung, Schlüssellochschlitz

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

length: 50.0 mm
width: 80.0 mm
height: 15.0 mm

Notes

Woodworking joint drawn for 3D printing: the parts lock together by shape, so a print can be joined without glue or screws. Drawn at true size with the parts line to line (zero gap) in their assembled position — add your printer's fit allowance to the mating faces (your AI or slicer can do this).
The hidden hanger on the back of signs, frames and printed wall mounts: the screw head enters the round hole and the plate slides down so the head sits in the pocket behind the slot.
Sized for a screw with a Ø4–4.5 mm shank and a head up to 9 mm (e.g. #8 / 4 mm pan or round heads); scale the three numbers for other screws.

Keyhole hanger slot size chart

dimension	value
stock	6 mm back plate
parts	plate, screw stand in
entry hole	Ø9 mm (passes the head)
slot	4.5 mm wide, 12 mm travel
head pocket	Ø9 mm, 3 mm deep behind the slot
assembles	over the screw head, slide down
holds	hangs flush on one screw; lift to remove

Where the files are

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

Xem Studio

Joinery design (geometry computed in the generator from traditional proportions)

web

Xem Studio design

Free files

★ Free files 3 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

keyhole-hanger-slot-plate	Back plate with the keyhole: Ø9 entry, 4.5 mm slot, 3 mm deep head pocket	STEP · STL
keyhole-hanger-slot-screw-stand-in	Stand-in screw: Ø4.5 shank, Ø9 × 2 mm head, in the locked position	STEP · STL
keyhole-hanger-slot-assembled	All parts in their assembled position (each part its own solid)	STEP · STL

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=keyhole-hanger-slot