step ladder made of stair treads
Light structure
High strength
Powerful anti-corrosion, durable and long working life
Beautiful appearance, bright surface
No dirt-rain-snow deposit, automatic cleaning, easy maintenance
Good ventilation, day lighting, heat dispersing, resistant to sliding and explosion
Easy installation and disassembly
There are normally 4 types(T1, T2, T3, T4) of stair treads. It’s divided by if there is nosing or fixed by welding.
T1 is stair tread without nosing and fixed by welding, T2 is stair tread without nosing and fixed by bolts. T3 is stair tread with nosing and fixed by welding. T4 is stair tread with nosing and fixed by bolts. The length and width can be made as customer’s need, then it can be adapted to different step ladder. We can also recommend sizes to customers.
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 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
|
