Inside corner gussets for 20, 30, 40 and 10-series extrusion — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t-slot-gussets/  (CC BY 4.0)
Basis: Inside corner gusset: legs the profile size × 0.8 profile tall, triangular web, one ISO 273 clearance hole per leg
Catalog version: 2026-10-20

Sizes: see table below
- Each gusset has two legs as long as the profile is wide and 0.8 × that tall, joined by a triangular web at mid-height.
- Legs are 3 mm thick on 20-series and 4 mm on 30, 40 and 10-series: 20 × 16 × 3, 30 × 24 × 4, 40 × 32 × 4, 25.4 × 20.32 × 4 mm.
- Each leg has one hole 0.6 × profile from the corner and 0.4 × profile up: Ø5.5 (M5), Ø6.6 (M6), Ø9 (M8), Ø7.14 (1/4-20).

series  leg_mm  thickness_mm  hole_mm  screw
20  20 × 16  3  5.5  M5
30  30 × 24  4  6.6  M6
40  40 × 32  4  9  M8
10 (1 in)  25.4 × 20.32  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-gussets/index.json
API: https://xemstudio.com/api/geometry?object=t-slot-gussets