Tread Dimensions
         Stair treads have been designed and manufactured to be strong and non-slip for safe usage and good economy.
 
¡á Standard Dimension and Weights (unit: mm)  
Symbol
Bearing Bar
Width
500
550
600
650
700
750
800
850
900
950
1000
1100
1200
b
SF-25
F25x5
215
6.2
6.7
7.2
7.7
8.2
8.6
9.2
9.7
10.1
10.6
11.2
12.1
13.1
120
5.3
5.8
6.3
6.8
7.3
7.7
8.3
8.8
9.2
9.7
10.3
11.2
12.2
-
245
7
7.5
8
8.5
9.2
9.6
10.2
10.8
11.3
11.8
12.4
13.5
14.5
150
5.9
6.5
7
7.5
8.1
8.6
9.2
9.7
10.2
10.8
11.4
12.4
13.5
-
275
7.7
8.3
8.8
9.4
10.1
10.6
11.2
11.8
12.4
13
13.7
14.8
16
180
6.5
7.1
7.7
8.3
8.9
9.4
10.1
10.7
11.3
11.8
12.5
13.7
14.8
-
SF-32
F32x5
215
7.3
7.9
8.5
9.1
9.8
10.3
10.9
11.5
12.1
12.7
13.4
14.5
15.7
120
6.6
7.2
7.7
8.3
9
9.5
10.2
10.8
11.3
11.9
12.6
13.8
14.9
-
245
8.2
8.9
9.5
10.2
10.9
11.5
12.2
12.9
13.5
14.2
14.9
16.2
17.5
150
7.3
8
8.6
9.3
10
10.6
11.3
12
12.6
13.3
14
15.3
16.6
-
275
9
9.8
10.5
11.2
12
12.6
13.4
14.2
14.9
15.6
16.4
17.8
19.3
180
8.1
8.8
9.5
10.2
11
11.6
12.5
13.2
13.9
14.6
15.4
16.9
18.3
-
SI-25
I25x5x3
215
5.4
5.9
6.2
6.6
7.1
7.4
7.9
8.3
8.7
9.1
9.6
10.3
11.1
120
4.5
5.
5.3
5.7
6.2
6.5
7
7.4
7.8
8.2
8.7
9.5
10.2
-
245
6.1
6.5
6.9
7.4
7.9
8.2
8.8
9.2
9.6
10.1
10.6
11.5
12.4
150
5
5.5
5.9
6.4
6.9
7.2
7.8
8.2
8.6
9.1
9.6
10.5
11.3
-
275
6.7
7.2
7.6
8.1
8.7
9.1
9.6
10.1
10.6
11.1
11.7
12.6
13.6
180
5.7
6.2
6.6
7.1
7.7
8.1
8.7
9.1
9.6
10.1
10.7
11.6
12.6
-
SI-32
I32x5x3
215
6.2
6.6
7.1
7.6
8.1
8.5
9
9.5
10
10.5
11
11.9
12.9
120
5.4
5.9
6.3
6.8
7.3
7.7
8.3
8.8
9.2
9.7
10.2
11.2
12.1
-
245
6.9
7.4
7.9
8.4
9
9.5
10.1
10.6
11.1
11.6
12.2
13.3
14.3
150
6
6.5
7
7.5
8.1
8.6
9.2
9.7
10.2
10.7
11.3
12.4
13.4
-
275
7.6
8.2
8.7
9.3
9.9
10.4
11.1
11.7
12.2
12.8
13.5
14.6
15.7
180
6.6
7.2
7.7
8.3
9
9.4
10.1
10.7
11.2
11.8
12.5
13.6
14.7
-
 
 
 
 
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