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.
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
| 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 |
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