Stair tread

 1,  Common used stair tread width is 700mm,800mm,900mm, the minimum width is 600mm.Mar width is inadvisable to be more than 1200mm.

2,  When tread is made of steel grating ,steel grating type is possible to select.

3,  The conjunction of tread and striger use welded or bolt-fixing, as shown in figure A.1.For bolt specification should not be less than M10.

 4,  When using bold joining, the steel grating’s end plate size t and installing hole A size show  in figure A.2 and table A.1.

Note: Installing hole can also choose to use 25X4 long circle hole, in order to be convenient for installation.

Table A.1 the selection of end plates size t and installing hole A size.        Unit is millimeter

5,  Tread type is divided into 4 kinds: T1,T2,T3 and T4(see table A.2)

6,  The nosing can be made of checkered plates, striped steels or other non-slip materials, according to the desire of customer.