Steel stair treads are the primary load-bearing grating product for industrial and commercial applications, also known as welded bar grating stair treads. Due to its robustness, durability, and high load-carrying capacity, it can meet all load-bearing application requirements, making it the most popular bar grating in many architectural, commercial, and industrial applications.
* Materials: Mild steel, Stainless steel, Aluminum steel
* Surface Treatment: Galvanized , Painting
Types of Steel Stair Treads
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Welded fixing, banded ends without nosing. | Bolted fixing, holed end plates without nosing. |
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Welded fixing, banded ends with checker plate nosing. | Bolted fixing, holed end plates with nosing. |
Specifications of Steel Stair Treads
* Length
1) Common length: 700, 800, 900 mm.
2) Maximum length: 1200 mm, suitable for several people passing at the same time in double direction or it is used as the escape line for workers.
3) Minimum length:600 mm, suitable for single person passing.
* Bearing Bar Pitch: 20 mm, 30 mm or 40 mm.
* Cross Bar Pitch: 50 mm or 100 mm.
* Nosing Type: checker plate, strip plate and hole plate.
* Bearing Load: 1.5kN.
* Deflection: no larger than 1/500 of span.
* Deflection Testing Method:
1) Span no larger than 1200 mm: press 1.5 kN load at the 100 mm × 100 mm area.
2) Span larger than 1200 mm: press 1.5 kN at the symmetrical 600 mm position.
* End Plate Size and Hole Size of Bolted Fixing Grating: refer to table 10.
* Tolerance of Steel Stair Treads
1) Length tolerance: +0/-3mm.
2) Width tolerance: ± 3mm.
3) Vertical tolerance. Vertical tolerance angle is no larger than 25°.
Steel Grating Tolerance for Stair Treads
Connection of Stair Treads and Ladder Beam
* Bolt connection: it adopts thickening end plate for welding and pre-holed on the end plate and fixed by bolts and nuts. It is recycled for other applications or places.
* Welded connection: it is difficult to uninstall but more economical and firmer than bolted connection.
Technical Parameters
Flat Bar Welded Steel Stair Treads Specification | ||||
Item | Plate Width (mm) | Plate Thickness (mm) | Plate Pitch (mm) | Cross Bar Pitch (mm) |
SGDF-01 | 65 | 5 | 20/30/40 | 50/100 |
SGDF-02 | 60 | 5 | 20/30/40 | 50/100 |
SGDF-03 | 55 | 5 | 20/30/40 | 50/100 |
SGDF-04 | 50 | 5 | 20/30/40 | 50/100 |
SGDF-05 | 50 | 3 | 20/30/40 | 50/100 |
SGDF-06 | 45 | 5 | 20/30/40 | 50/100 |
SGDF-07 | 40 | 5 | 20/30/40 | 50/100 |
SGDF-08 | 40 | 3 | 20/30/40 | 50/100 |
SGDF-09 | 35 | 5 | 20/30/40 | 50/100 |
SGDF-10 | 35 | 3 | 20/30/40 | 50/100 |
SGDF-11 | 32 | 5 | 20/30/40 | 50/100 |
SGDF-12 | 32 | 3 | 20/30/40 | 50/100 |
SGDF-13 | 25 | 5 | 20/30/40 | 50/100 |
SGDF-14 | 25 | 3 | 20/30/40 | 50/100 |
SGDF-15 | 20 | 5 | 20/30/40 | 50/100 |
SGDF-16 | 20 | 3 | 20/30/40 | 50/100 |
Heavy Duty Press-Locked Steel Stair Treads Specification | |||||
Item | Plate Width (mm) | Plate Thickness (mm) | Plate Pitch (mm) | Cross Bar Size (mm) | Cross Bar Pitch (mm) |
SGDP-01 | 150 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-02 | 130 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-03 | 120 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-04 | 100 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-05 | 90 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-06 | 80 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-07 | 75 | 8 | 40 | 8 × 8 | 50/100 |
SGDP-08 | 75 | 6 | 30 | 8 × 8 | 50/100 |
SGDP-09 | 75 | 6 | 40 | 8 × 8 | 50/100 |
SGDP-10 | 70 | 6 | 30 | 8 × 8 | 50/100 |
SGDP-11 | 70 | 6 | 40 | 8 × 8 | 50/100 |
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