Haunched mortise and tenon joint — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/haunched-mortise-and-tenon-joint/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design — geometry computed in the generator from traditional proportions
Catalog version: 2026-10-20

Overall (mm): length 50.0, width 80.0, height 20.0
- 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).
- At a corner the tenon is narrowed so the mortise does not break out of the end of the stile; the short haunch fills the groove line and stops the rail twisting.

dimension  value
stock  20 × 20 mm square
parts  stile, rail
tenon  11 × 6.67 mm, 15 mm long
haunch  6.5 mm wide, 5 mm long
assembles  straight in
holds  racking and twisting at a corner; the haunch keeps the rail from twisting

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Xem Studio: Joinery design (geometry computed in the generator from traditional proportions) — web — Xem Studio design — https://xemstudio.com/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/haunched-mortise-and-tenon-joint/index.json
API: https://xemstudio.com/api/geometry?object=haunched-mortise-and-tenon-joint