Our company produces steel ladders with guardrail, which are made of grating treads.
When specifying the steel ladders, pls refer to the national standard construction drawing
87J432. According to whether the nosings are to be used and the methods of mounting
to stringers, stair treads are classified into four types: T1, T2, T3, T4. We suggest that the
dimensions are as follow:
| Item |
Recommended maximum stair treads length (mm) |
| Bearing bar dimension mm |
25*3 |
25*5 |
32*5 |
| Bearing bar's pitch at 30 mm |
550 |
900 |
1300 |
| Bearing bar's pitch at 40 mm |
450 |
750 |
1200 |
| Item |
Recommended stair treads width (mm) |
T1/T2/T3/T4
Bearing bar pitch at 30mm |
95 |
125 |
155 |
185 |
215 |
245 |
275 |
T1/T2
Bearing bar pitch at 40mm
T3/T4 |
|
125 |
165 |
|
205 |
245 |
285 |
| |
115 |
155 |
|
195 |
235 |
275 |
| Fixing hole center(mm) |
45 |
75 |
100 |
150 |
Here are all types of stair treads:
1. galvanized staircase metal
We manufacture different styles of stair ladders that used in family,industry and construction.
Material: mill steel black and hot dip Galvanizing / and stainless grating
Usage: ladder, flooring walkway, platform ,steel structures, stair tread, well cover, trench cover, sump cover,compound gratings, storage shelves,fences and handrail so on for construction project, oil project, seaport, power plant, water plant, defense project, chemical factory and so on.
2Stair Tread Types: galvanized staircase metal
1)There are four kinds of stair treads T1,T2,T3,T4.
T1 Welded fixing and Without nosing
T2 Bolted fixing and without nosing,easy to installation and teardown.
T3 Welded fixing and with checkered plate nosing, can be skid.
T4 Bolted fxing and with checkered plate nosing, easy be installation,
teardown and can be skid.
2) Material: Mild Steel (Low Carbon Steel) or Stainless Steel
4) Steel grating standards:
A) China: YB/T4001-1998
B) USA: ANSI/NAAMM (MBG531-88)
C) UK: BS4592-1987
D) Australia: AS1657-1988
E) Japan: JJS
3. galvanized staircase metal specification
| Pitch of Bearing bar |
Cross-bar Pitch |
Specification of bearing bar load(width×thickness) |
| 32×5 |
40×5 |
45×5 |
50×5 |
55×5 |
60×5 |
| 30 |
100 |
G325/30/100 |
G405/30/100 |
G455/30/100 |
G505/30/100 |
G555/30/100 |
G605/30/100 |
| 50 |
G325/30/50 |
G405/30/50 |
G455/30/50 |
G505/30/50 |
G555/30/50 |
G605/30/50 |
| 40 |
100 |
G325/40/100 |
G405/40/100 |
G455/40/100 |
G505/40/100 |
G555/40/100 |
G605/40/100 |
| 50 |
G325/40/50 |
G405/40/50 |
G455/40/50 |
G505/40/50 |
G555/40/50 |
G605/40/50 |
| 60 |
50 |
G325/60/50 |
G405/60/50 |
G455/60/50 |
G505/60/50 |
G555/60/50 |
G605/60/50 |
4. galvanized staircase metal manufacturer process
5.our company review
Hebei Jiuwang Metal Wire Mesh Co.,Ltd.(original Anping County Jintai Metal Mesh Co.,Ltd.).Established in 1992,our company is a manufacturer of large steel structure and steel gratings,integrating development,production and distribution.The company register capital is 10,080,000 Yuan,and take an area of 34,680 square meters.In 2003,we have got the ISO9001:2000 certification by BQR.
galvanized fixing grating clips application
flat bar grating for staircase
serrated bearing bar grating for staircase
grating for staircase package
sewage treatment plant
7.WHY CHOOSE OUR COMPANY
1.Own independent three press-welded steel grating machine and we have our own biggest galvanization product line in local market
2.profession design and drawing teams customize based on customers'requirement
3.ISO9001 Certificate
4.Located in Anping wire mesh base Hebei province,near from Beijing airport,Tianjin sea Port!
5.Now we adopted automatic bending machine, robot welding machine,the grating quality get more perfect and price more competitive!
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