2 × 3 hole joining plates for 20, 30, 40 and 10-series extrusion — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t-slot-joining-plates/  (CC BY 4.0)
Basis: Flat plate, 2 × 3 holes on the profile pitch, ISO 273 clearance holes, 5 mm thick
Catalog version: 2026-10-20

Sizes: see table below
- Each plate is 5 mm thick with R3 corners and six holes in a 2 × 3 grid on the profile pitch, one hole per profile centreline.
- 20-series: 40 × 60, Ø5.5 holes (M5) on 20 mm pitch. 30-series: 60 × 90, Ø6.6 (M6) on 30. 40-series: 80 × 120, Ø9 (M8) on 40. 10-series: 50.8 × 76.2, Ø7.14 (1/4-20) on 25.4.
- Use it to join profiles in a T or L, or as a mounting grid.

series  plate_mm  pitch_mm  hole_mm  screw
20  40 × 60 × 5  20  5.5  M5
30  60 × 90 × 5  30  6.6  M6
40  80 × 120 × 5  40  9  M8
10 (1 in)  50.8 × 76.2 × 5  25.4  7.14  1/4-20

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: T-slot nut — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/T-slot_nut
- OpenBuilds: Tee nuts and brackets for V-slot — web, STEP — OpenBuilds site [verify license at link] — https://openbuildspartstore.com/
- Long Earth Society: Engine and rig builds on extrusion frames — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/t-slot-joining-plates/index.json
API: https://xemstudio.com/api/geometry?object=t-slot-joining-plates