T-slot shelf boards for 15-series frames: 8 to 16 in deep, 24 to 48 in wide — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/t-slot-shelf-boards/  (CC BY 4.0)
Basis: Xem Studio design: ¾ in panels with counterbored 5/16-18 holes on the centre lines of 1.5 in rails under each edge
Catalog version: 2026-10-20

Sizes: see table below
- Sits on a rail at front and back (or on cantilever plates); same hole rule as the bench tops.

width_in  depth_in  holes
24  8  6
30  8  8
36  8  8
48  8  10
24  10  6
30  10  8
36  10  8
48  10  10
24  12  6
30  12  8
36  12  8
48  12  10
24  16  8
30  16  10
36  16  10
48  16  12

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 80/20: 15 series T-slot profiles and fasteners (1.5 in rail, 5/16-18 hardware) — web — maker's catalogue; numbers cited — https://8020.net/1515.html

Free files (CC BY 4.0, Xem Studio; STEP + STL, 16 parts): https://xemstudio.com/files/hardware/t-slot-shelf-boards/index.json
API: https://xemstudio.com/api/geometry?object=t-slot-shelf-boards