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checker plate nosing stair treads

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:

Stair treads' max length:

bearing bar specification 25*3 25*5 32*5

bearing bar pitch at 30 mm 550 900 1300

bearing bar pitch at 40 mm 450 750 1200