M8 captive nut slot (side-loaded) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/captive-nut-slot-m8/  (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 21.0, width 31.5, height 16.8
- 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).
- A slot that takes an M8 nut from the side, for a nut in the middle of a part (e.g. under a clamp screw).
- Drawn at the nut's true size: add your fit allowance to the slot width and height. The slot ceiling is a short bridge.

dimension  value
stock  21 × 31.5 × 16.8 mm test block
parts  block, nut
slot  13 mm wide (nut across flats), 6.8 mm tall (nut height), open to the side
screw hole  Ø8 mm
assembles  slide the nut in from the side, screw through
holds  the nut mid-part, where a top pocket can't reach

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/captive-nut-slot-m8/index.json
API: https://xemstudio.com/api/geometry?object=captive-nut-slot-m8