hot dipped galvanized steel grating used for stair tread
Stair tread is made of steel grating& widely used for different types ofsteel ladders,feature easy installation,strong structure&aeatheic appearance&good water permeability.We can fabricate according customer'size.
25x3, 25x4, 25x4.5, 25x5, 30x3, 30x4, 30x4.5, 30x5, 32x5, 40x5, 50x5, 65x5, 75x6, 75x10---100x10mm etc
I bar: 25x5x3, 30x5x3, 32x5x3, 40x5x3 etc
US standard: 1''x3/16'', 1 1/4''x3/16'', 1 1/2''x3/16'', 1''x1/4'', 1 1/4''x1/4'', 1 1/2''x1/4'', 1''x1/8'', 1 1/4''x1/8'', 1 1/2''x1/8'' etc
Bearing Bar Pitch
12.5, 15, 20, 23.85, 25, 30, 30.16, 30.3, 32.5, 34.3, 35, 38.1, 40, 41.25, 60, 80mm etc
US standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc.
Plain / Smooth, Serrated /teeth, I bar, serrated I bar
Features for grille stair tread:
1. Easy for assembly and disassembly.
2. Good ventilation of air and light, heat dissipation.
3. Anti-slip & anti-explosion.
4. Easy for maintenance.
5. The aiti-slip treads possess unmatched slip resistance property, which are suitable for using in wet and slippery places like the offshore oil production platform.
6. The HDG surface provide strong antirust capacity with service life upto 30 years without any maintenance.
7. High drainage rate.
It can be used in factory platform,walkway ,and other places.
Galvanized steel stair treads
Low carbon steel
CN: Q235, US: A36, UK: 43A
CN: YB/T4001-1998, US: ANSI/NAAMM, UK: BS4592-1987, AUS1657-1988, JJS
CE, GOST, ISO9001, ISO14001, HSE
Bearing bar size
20X3, 25X3, 25X4, 25X5, 30X3, 30X4, 30X5, 32X3, 32X5, 40X5, 50X4... 75X8mm, etc
Bearing bar pitch
Bearing bar type
Plain, Serrated (tooth-like), I bar (I section), Serrated-I
Cross bar size
5X5, 6X6, 8X8mm (twisted bar)/5, 6, 8mm ( round bar)
Cross bar pitch
40, 50, 60, 65, 76, 100, 101.6, 120, 130mm, etc.
Black, self colour, hot dip galvanized, painted, spray coating
CN: GB/T13912, US: ASTM (A123), UK: BS729
power plants, shipbuilding, large equipment, industrial constructions
Hot dip galvanizing galvanized outdoor steel grating stair treads
We produce three kinds of steel gratings, they are Plain Style Steel Grating, Serrated Style Steel Grating and I Bar Type Steel Grating. They are widely used in steel structure platforms, stair treads, sidewalks, drainages and well covers etc. We can design and manufacture standard steel grating and in customized shapes per client's requirements.
1) 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.
2) 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.>
3) 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.
Mild Steel (Low Carbon Steel) or Stainless Steel
5) Surface Treatment:
Untreated, Painting or Hot dip Galvanizing
6) Steel grating standards:
A) China: YB/T4001-1998
B) USA: ANSI/NAAMM (MBG531-88)
C) UK: BS4592-1987
D) Australia: AS1657-1985
Bearing bars at 30mm pitch
|Fixing hole centers||45||75||100||150|
Note: based on 5mm bearing bars
Max.stair tread lengths
|Bearing bar section||25*3||25*5||32*5|
|Bearing bar pitch:30mm||550mm||900mm||1300mm|
|Bearing bar pitch:40mm||450mm||750mm||1200mm|
|Welded steel grating, pressure-locked, socket-welding|
|Steel flat size||20×3,25×3,25×5,30×3,30×4,30×5,32×3,32×5……45×5mm|
|Beraing bar pitch||12.5,15,20,25,30,35,40,50mm|
|Cross bar pitch||38,50,80,100mm|
|material||Low carbon steel, stainless steel, aluminium|
|Surface treatment||Untreated, hot galvanized, painted|
China: YB/T 4001.1-2007
Australia: AS 1657-1985
Galvanised steel stair treads perforated metal mesh ladder step
Perforated metal specification
1. Plate selection
When select the plate, make sure that take both application requirement and product cost into consideration.
If you’d like to reduce the thickness of plate, you’d better use the alloy materials with slightly higher price.
At the same time the hardness and strength of plate directly determines the sizes and arrangement of holes.
We can supply the plate materials as follows: Stainless Steel plate, High or Low carbon Steel Plate,
Galvanized Plate, Zinc Plate, Aluminum Plate, Aluminum Alloy Plate, Mg-Al Plate and Nickel Plate ,etc.
In general it is advisable to use a hole size larger than the material thickness. That is, to meet the minimum
aperture principle. The closer the hole size and material thickness,
the more difficult and expensive the process is. Dependent on the material type,
smaller hole size to material ratios can be achieved. The minimum diameter we can fabricate is 0.8mm.
If you have the special need,we wil try best to meet your need with the most reasonable price and the most
3. Hole spacing
Hole center is the distance from the center of one hole to the center of the nearest hole
in the next adjoining row.
Hole spacing is a way to indicate hole center, another way is opening area.
Both the significance of two methods is the same. You only need to determine either of both.
4 .Plate specification
The thin plate is easier to perforate and the price is relatively low. According to the principle of minimum
the suitable thickness is more conductive to increasing the compressive strength. In general,
the plate has the tolerance,
we can manufacture a wide rang of thick sheet verifying from 0.1mm to 2.5 mm thickness Sheet width
Length is the overall measurement of the long side of the sheet.
Width is the overall measurement of the -short side of the sheet.
The standard sheet size is 1000mm*2000mm. The coil width 1000mm is also available.
We also can process the special product for your requirement if you tell us the exact specification.
5. Opening area
Clearly, open area is the total area of the holes divided by the total area of the sheet and is expressed as a percent ,
Keep in mind that punching holes in a material add stresses that can result in distortion of the product.
The higher the open area, the more material distortion takes place,
especially when the perforated pattern is bordered by margins on all four sides.
But these distortions can be removed by our special in house leveling process.
Therefore, the flatness request of products wlill be sent after you take careful consideration in it.
Margins are the blank area along the edges of the sheet. In general, the long sides of plate need the margins,
and the short sides not. If you want the product with special margins,you should provide the width of each margin
on all four sides (measured from the edge of the sheet to the edge of the first hole).
Manufacturing considerations may affect margins. If the margins requested are not possible.
We will replace it with the similar products as your consideration.
There are tolerances on thickness, pitch, openings, flatness, and shearing for perforated products.
It is the same as other production process, The higher the request about tolerance,
the price of the products will be higher relatively.
You should specify a specific tolerance, so we can give you a precise product.
If not, we will according to standard tolerance.
Anti-skid stair treads specification
Thickness:generally 2mm, 2.5mm, 3.0mm
Width: 300mm, 500mm, 800mm, 1000mm
Length: 1m, 2m, 2.5m, 3.0m, 3.66m
Height: 20mm, 40mm, 45mm, 50mm, also can produce as customized bending height.
Material: Low carbon steel, SPHC, Aluminum,Galvanized Plate, Stainless Steel sheet.
Production technique: Punching, cutting, bending, welding, shape.
(Both Electro galvanized and Hot Dipped galvanized surface treatment are available for low carbon steel material)
Features: anti-skid, anti-rust and anti-corrosion, durable and sturdy application shows beautiful appearance.
Application: used well for sewage treatment, for running water and power plant, also used for outdoor of many other lines,
such as safety grating for vehicles, steppes for train, safety stair treads for machines and for interior decoration
|Name||Steel Perforated Stair Tread|
|Material||Stainless steel,Mild steel,galvanized steel,aluminum,copper,etc.|
|Shaped hole||Alligator mouth hole, round,drum-type|
|Feature||Anti-corrosion; skid resistance;drainage|
Heavy duty 30x3 hot dipped galvanized outdoor steel grating stair treads
Steel Grating is made by Carbon or mild steel of certain sizes through the processing of slit cutting, serration-making, press welding, inspecting before galvanization, galvanizing, checking before packing, etc.
Steel grating is designed scientifically and equisitely, is very strong and safe to support floors and walkways. It can be used for ceiling, interior and exterior decoration, platform aisle, ventilation windows, (Wells), advertising plaque and other construction.
1) Bearing bar specification:20*3 to 100*6
2) Bearing bar pitch:12.5,22.214.171.124mm etc,or according customer's requirement.
3) Cross bar pitch:38,50,76,100mm,or according to customer's requirement.
4) Material:mild steel or stainless steel
5) Surface treatment:painting or hot dipped galvanized
Steel stair tread is a kind of open steel plate with its bearing bar & cross bar jointing at intersections either by welding or by locking. It can be manufactured into round, square, rectangle or other shapes. Widely used in stairways of steel structures and steel ladders, this stair tread is significantly easier to install and maintain. We can provide various standard products and are happy to fulfill customized orders.
|Load Bearing Flat Bar size||Thickness≥3mm, depth ≥19mm|
|19X3,19X5,20X3, 20X5, 25X3, 25X4, 25X4.5, 25X4.7, 25X5…..40X6, 40X8, 40X10,….90X6….|
|Pitch of Load bearding flat bars(mm)||12.5,15, 20, 30, 30.6, 32.5, 34, 34.8, 35.3, 40, 60, 80……|
|Pitch of cross bars(mm)||38.1, 50, 50.8, 70, 75, 80, 100, 101.6, 102……|
Customized Galvanized Steel Stair Tread With ISO9001 CE Certificate
Grating treads can be made from any grating pattern or profile, and to any dimensions to suit the relevant stairway. In the interest of economy we suggest that the recommended widths and lengths be used wherever possible.
Recommended Stair Tread Widths
The tables below indicate the maximum width and length for stair treads, depending on the combination of material, pattern and load bar selected. Standard stair treads are available ex-stock from Webforge locations; these standard profiles are complimented by a custom manufacturing service.
Bearing bars at 30mm pitch
Bearing bars at 40mm pitch
|Fixing hole centers||45||75||100||150|
Note: based on 5mm bearing bars.
Max. Stair Tread Lengths
Bearing bar measure
Steel grating specification
|Bearing bars at 30mm pitch||550||900||1300|
|Bearing bars at 40mm pitch||450||750||1200|
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