Blind mortise and tenon joint — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/blind-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 80.0, 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).
- The classic frame joint: a tenon one third of the stock thick, stopped inside the mortised member so the end grain is hidden.
- Print the rail with the tenon flat on the bed; the stile prints with the mortise opening up.

dimension  value
stock  20 × 20 mm square
parts  stile, rail
tenon thickness  6.67 mm (one third of the stock)
tenon width  15 mm (2.5 mm shoulders)
tenon length  15 mm (three quarters of the mortised member)
assembles  the tenon slides straight into the mortise
holds  racking; add a pin or glue against pull-out (see pegged and drawbored)

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/blind-mortise-and-tenon-joint/index.json
API: https://xemstudio.com/api/geometry?object=blind-mortise-and-tenon-joint