Snap-in slot covers for 20, 30, 40 and 10-series extrusion (100 mm) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t-slot-covers/  (CC BY 4.0)
Basis: Stem = slot opening × lip (exact), snap barb = opening + 1.2 (designed), cap = opening + 2.4 wide
Catalog version: 2026-10-20

Sizes: see table below
- Each cover is 100 mm long: a 1.2 mm thick cap 2.4 mm wider than the opening, a stem the slot opening wide by the lip thick, and a 1 mm snap barb 1.2 mm wider than the opening (0.6 mm each side, designed) that springs behind the lips.
- 20-series: cap 8.4, stem 6 × 1.8, barb 7.2. 30-series: cap 10.4, stem 8 × 2.5, barb 9.2. 40-series: cap 10.4, stem 8 × 3, barb 9.2. 10-series: cap 8.9, stem 6.5 × 2.3, barb 7.7.
- Covers hide wiring in the slot and keep debris out.

series  cap_mm  stem_mm  barb_mm  length_mm
20  8.4  6 × 1.8  7.2  100
30  10.4  8 × 2.5  9.2  100
40  10.4  8 × 3  9.2  100
10 (1 in)  8.9  6.5 × 2.3  7.7  100

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-covers/index.json
API: https://xemstudio.com/api/geometry?object=t-slot-covers