Extrusion end feet for 20, 30, 40 and 10-series — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t-slot-feet/  (CC BY 4.0)
Basis: Square foot 1.6 × the profile, socket = profile outline (exact) 3 deep, clearance hole for a screw into the centre bore
Catalog version: 2026-10-20

Sizes: see table below
- Each foot is a 6 mm thick square 1.6 × the profile size with R4 corners, a socket the exact profile outline 3 mm deep, a clearance hole for the screw into the profile's centre bore, and a recess the profile's width in diameter, 1.5 mm deep, underneath.
- 20-series: 32 × 32, Ø5.5 for M5. 30-series: 48 × 48, Ø9 for M8. 40-series: 64 × 64, Ø9 for M8. 10-series: 40.64 × 40.64, Ø7.14 for 1/4-20.
- The screw threads into the profile's centre bore (M5 on 20-series, M8 on 30 and 40).

series  foot_mm  socket_mm  hole_mm  screw
20  32  20 × 20 × 3  5.5  M5
30  48  30 × 30 × 3  9  M8
40  64  40 × 40 × 3  9  M8
10 (1 in)  40.64  25.4 × 25.4 × 3  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-feet/index.json
API: https://xemstudio.com/api/geometry?object=t-slot-feet