T4 Non-slip nosing 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 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
T4 Non-slip nosing stair treads
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Factory Add: NO.8 Xicheng Street, Raoyang County, Hengshui City, Hebei Province
Tianjin sales office: Room 603, Block C, Renaihaojingguoji, Hongqi Road, Nankai District, Tianjin, China