L corner brackets for 20, 30, 40 and 10-series extrusion — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t-slot-corner-brackets/  (CC BY 4.0)
Basis: L bracket as wide and tall as the profile, one screw slot per leg at ISO 273 clearance (M5 Ø5.5, M6 Ø6.6, M8 Ø9.0, 1/4-20 Ø7.14), side gussets
Catalog version: 2026-10-20

Sizes: see table below
- Each bracket is an L the size of the profile (20, 30, 40 or 25.4 mm cube) with a gusset on each side.
- Leg thickness is 3 mm on 20-series, 4.5 on 30, 6 on 40 and 3.81 on 10-series.
- Each leg has one screw slot at ISO 273 clearance: 20-series Ø5.5 × 6 long (M5), 30 Ø6.6 × 9 (M6), 40 Ø9 × 12 (M8), 10-series Ø7.14 × 7.62 (1/4-20).
- The legs are flat; there is no locating tongue on these brackets.

series  size_mm  thickness_mm  slot_mm  screw
20  20  3  5.5 × 6  M5
30  30  4.5  6.6 × 9  M6
40  40  6  9 × 12  M8
10 (1 in)  25.4  3.81  7.14 × 7.62  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-corner-brackets/index.json
API: https://xemstudio.com/api/geometry?object=t-slot-corner-brackets