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Steel stair treads can be made of low carbon steel, aluminum steel and stainless steel gratings.
The low carbon steel grating can be galvanized and painted for better corrosion resistance.
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°. View to get more information.
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