How to find the right Biscuits & Plugs AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Biscuits & Plugs
- Biscuit size matches the slot
- Buy the size your joiner is set to cut: #0, #10 or #20 for standard joiners. Use #20 where the stock is wide enough for it. An undersized biscuit leaves a sloppy joint, and an oversized one will not seat or will blow out thin stock.
- Compressed, dry beech
- Biscuits should be compressed beech, stored sealed and dry until glue-up. Water-based glue swells a compressed biscuit to lock the joint, so biscuits that have already absorbed humidity fit tight and lose that swelling grip.
- Plug diameter matches the counterbore
- Plug diameter must equal the counterbore drill size exactly. Wood plugs only hide a screw cleanly when they press-fit without gaps.
- Face-grain plugs for invisible repairs
- Choose face-grain (side-grain) plugs, or cut your own with a plug cutter, and match the species. End-grain plugs absorb finish differently and show as dark dots.
Brands that matter
- Lamello: Swiss originator of biscuit joinery, known for consistent biscuit sizing.
- Porter-Cable: Widely sold biscuits sized for common plate joiners.
- DeWalt: Plate joiner maker that also sells matching biscuits.
What to avoid
- Bulk biscuits that arrive loose and unsealed in humid conditions
- End-grain plugs where the repair must disappear under clear finish
- Using biscuits as the main strength in load-bearing joints; they are mostly for alignment
Questions
Are Festool Domino tenons the same as biscuits?
No. Dominos are loose tenons for a different machine and do not fit biscuit slots.