Central Spine Flight
By Huu Khanh Nguyen · Updated October 28, 2026 · stair, flight
A stair flight carried by one steel spine under the centre line, each tread held on its own bracket.
Parameters
| Name | Default | Unit |
|---|---|---|
| Number of risers (the flight has risers - 1 treads) | 13 | |
| Riser height | 175 | mm |
| Going, nosing to nosing (y) | 250 | mm |
| Clear width of the flight (x) | 900 | mm |
| Tread nosing overhang passed to the tread (y) | 25 | mm |
| Tread thickness passed to the tread (z) | 38 | mm |
| Spine width across the flight (x) | 152.4 | mm |
| Spine depth normal to the slope | 203.2 | mm |
| Finish of the flight's own parts | white |