Steel bar grating is a good choice for strength, safety, long-term cost and durability.
Bar Grating consists of a series of bearing bars, welded (or otherwise joined) at various intervals to perpendicular cross bars to form a load-bearing panel. It is available in a wide selection of panel sizes.

Stair treads are the horizontal sections of stairs that serve as the step surface of each step.
These treads are installed on the top of each step.

1.Material: Low Carbon Steel or Stainless Steel
2.Surface Treatment: Untreated, Painting or Hot Dipped Galvanizing
3.Steel grating standards:
A. China: YB/T4001-1998
B. USA: ANSI/NAAMM (MBG 531-88)
C. UK: BS4592-1987
D. Australia: AS1657-1988

Specifications:
--Bearing Bar (Load Bar) Specifications (mm):
The specification of plain type and serrated type bearing bar is 20 x 3 to 100 x 10.
The specification of I-section type is 25 x 5 x 3, 32 x 5 x 3, 38 x 5 x 3, 40 x 5 x 3, 50 x 5 x 3, 50 x 7 x 4,55 x 7 x 4, 60 x 7 x 4, 65 x 7 x 4, 70 x 7 x 4, 75 x 7 x 4, etc.

--Bearing Bar Pitch (center to center):
12.5, 15,25, 30, 30.16, 32.5, 34, 40, 41.25, 45, 50, 60, 60.32, 80, 100 mm etc, also be according to client's requirement and 30, 40, 60mm are recommended,
America standard is available : 1' x 3/16', 1 1/4' x 3/16', 1-1/2' x 3/16', 1' x 1/4', 1-1/4' x 1/4',1 1/2' x 1/4'(19-w-4),(19-w-2) and so on.

--Cross Bar Pitch (center to center):
38, 50, 76, 100, 101.6mm etc, also be according to client's requirement and 50, 100mm are recommended, America standard is available.

Application:
Steel grating is widely used in platforms, walkways, trestles, ditch covers and well covers in petrochemical industry, power plants, water plants, sewage treatment plants, municipal engineering, environmental sanitation engineering and other fields.