Timber bracket size guide: nominal vs actual
Measure the real size, then pick the set.
Timber is sold by nominal size, but planed timber is smaller. Rough-sawn and full-dimension timber can be the full size. Brackets have to fit the real size, so measure before you order.
| Nominal | Typical planed (S4S) | Rough-sawn / full | Our sets |
|---|---|---|---|
| 4x4 | 3.5" × 3.5" | 4" × 4" | Knee brace 4x4 |
| 6x6 | 5.5" × 5.5" | 6" × 6" | TP6, TD6, knee brace 6x6 |
| 8x8 | 7.5" × 7.5" | 8" × 8" | TP8, TD8, fan plate |
How to measure
- Measure the face of each member where a plate lands, not just the post.
- Measure in a couple of places; rough timber varies.
- Note any member that's a different size (a 6x8 rafter on 8x8 posts, for example).
Strap width
King-post with diagonals sets are named by strap width (4", 6", 8"). Pick a strap a little narrower than your timber face so the steel sits inside the edges.
Plate thickness
Standard (7ga): 7 gauge A36, 0.1793" (about 3/16"). Heavy (1/4"): 1/4" A36. Priced by quote (about +$80–$90 on a 6-plate set). Heavier plate is priced by quote.
Odd sizes, mixed sizes and full-dimension timbers are welcome through the custom quote. We send a dimensioned drawing before we cut.