| Class | No. of specimen | Thickness of tension bar (mm) | Turnbuckle dimensions (mm) | Connection bolt (mm) | |
|---|---|---|---|---|---|
| Inverted king-post timber truss A (15) | 1 | a | 12 | 12.700 | M10 |
| b | 12 | 12.700 | M10 | ||
| 2 | a | 16 | 15.875 | M10 | |
| 3 | a | 16 | 15.875 | M12 | |
| b | 16 | 15.875 | M12 | ||
| Inverted king-post timber truss B (30) | 1 | a | 12 | 12.700 | M10 |
| 3 | a | 16 | 15.875 | M12 | |
| b | 16 | 15.875 | M12 | ||
| c | 16 | 15.875 | M12 | ||
| d | 16 | 15.875 | M12 | ||