Stair Treads
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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 six types: T1, T2, T3, T4, T5, T6.
T1 TYPE
Stair Treads using common, ordinary steel flat bar to make and close ended system, not welding pattern guard board and antislipstrip, not welding installed side plate and checkered plate, its simple structure. When using it, we only need to weld it on the steel beam, it is very simple,economic and practical, and such stair tread is widely used in the smaller project .
T2 TYPE
Using common steel welding production, both ends of the stair tread are banded with side plates, On each plate, there is 14 mm in diameter round hole and a long round hole. The side plate chamfering for easy installation. Production is completed need to punch on the steel beam then with bolt to install. This type is used more widely, features: removable and use again.
T3 TYPE
This type of stair treads is the most widely used. The front end welding pattern plate protect nosing, and plays the beautiful, prevent slippery, wear resistance role. When installation, the way by welding installation, simple and saving time. With the checkered plate covering the sharp edges and corners, avoid the slippery to knock against caused serious damage.
T4 TYPE
T4 stair tread owns the T2 bolt installation advantages and T3 beautiful safe advantages. Since it can be with bolts installation, facilitate disassembling ; The decorative pattern and welding plate protect nosing, beautify and security two not mistake. Reuse efficiency is high, set the advantages of the above several types, so the price in the series is also the highest.
T5 TYPE
T5 stair tread is using belt ditch shape steel make protect nosing instead of decorative pattern plate. The effect, the quality, usage and method of use are same as T3 type .This type is used less.
T6 TYPE
T6 Stair tread also use belt ditch shape steel do protect nosing instead of decorative pattern plate . The effect, the quality, usage are the same as T4 Type. Due to apparence of the bar steel nosing not nicer than decorative pattern plate , so this Type is also used less.
We suggest that the metal stair treads 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/T5/T6
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 Pls see the above application photos for reference.
Stair Treads
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