Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515 — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/t-slot-extrusions/ (CC BY 4.0) Basis: Common European / Misumi 20-, 30- and 40-series profiles (6 and 8 mm slots), OpenBuilds V-slot, and 80/20 10- and 15-series inch profiles; cavity dimensions typical of the 'standard' (non-light) profile, ±0.3 mm by maker Catalog version: 2026-10-20 Sizes: see table below - 20-series (2020, 2040…): 20 mm pitch, 6.0 mm slot opening, ~11 mm wide slot cavity behind 1.8 mm lips, 6 mm deep, Ø4.2 centre bore (tap M5). V-slot is the same with 6.2 mm opening and 45° chamfered lips for Delrin wheels. 30-series: 8 mm slot, Ø6.8 bore (M8). 40-series: 8 mm slot (10 mm on heavy), Ø6.8–8.5 bore. 80/20 10-series: 1 in, 0.256 in (6.5 mm) slot, 0.2 in bore (1/4-20); 15-series: 1.5 in, 0.32 in (8.2 mm) slot, 0.26 in bore (5/16-18). - Print the profile to check brackets before cutting aluminium: 100 mm stubs here. Printed extrusion is not structural, but a printed 2020 stub with slide-in nuts is exactly how to prototype a mount. - Design rule for attachments: anything that touches the extrusion face is flat; anything in the slot is 5.8 mm wide (6 mm slot) or 7.8 mm (8 mm slot) and no deeper than the lip + 0.5 mm unless it is a nut. Tongues on brackets stop rotation. M5 button heads on 20-series, M8 on 40-series. - LES: the engine test stands and the generator rigs are 2020 and 2040 frames with the printed brackets in the companion entry. profile size_mm slot_mm cavity_mm depth_mm bore_mm type 2020 20 × 20 6.0 11.0 6.0 4.2 T 2040 40 × 20 6.0 11.0 6.0 4.2 T 2060 60 × 20 6.0 11.0 6.0 4.2 T 2080 80 × 20 6.0 11.0 6.0 4.2 T 4040 (20-series double) 40 × 40 6.0 11.0 6.0 4.2 T V-slot 2020 20 × 20 6.2 11.0 6.0 4.2 V V-slot 2040 40 × 20 6.2 11.0 6.0 4.2 V V-slot 2080 80 × 20 6.2 11.0 6.0 4.2 V 3030 30 × 30 8.0 16.5 8.5 6.8 T 3060 60 × 30 8.0 16.5 8.5 6.8 T 4040 40 × 40 8.0 20.0 9.5 6.8 T 4080 80 × 40 8.0 20.0 9.5 6.8 T 4040 heavy (10 mm slot) 40 × 40 10.0 22.0 11.0 8.5 T 1010 (1 in, 10-series) 25.4 × 25.4 6.5 14.4 7.1 5.1 T 1020 50.8 × 25.4 6.5 14.4 7.1 5.1 T 1515 (1.5 in, 15-series) 38.1 × 38.1 8.2 20.5 9.6 6.6 T Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Wikipedia: T-slot structural framing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/T-slot_structural_framing - Misumi: Aluminum extrusions HFS5 (20 mm) / HFS6 (30 mm) / HFS8 (40 mm) series drawings — web, STEP, PDF — Misumi site terms [verify license at link] — https://us.misumi-ec.com/vona2/mech/M1500000000/M1501000000/ - 80/20 Inc.: 10-series and 15-series T-slot profiles — web, STEP, PDF — 80/20 site terms [verify license at link] — https://8020.net/ - OpenBuilds: V-Slot linear rail profiles — web, STEP — OpenBuilds, CC BY-SA 4.0 (V-Slot) [verify license at link] — https://openbuildspartstore.com/v-slot-linear-rail/ - 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, 16 parts): https://xemstudio.com/files/hardware/t-slot-extrusions/index.json API: https://xemstudio.com/api/geometry?object=t-slot-extrusions