Non galvanized stair tread

Non galvanized stair tread: 

1)Material: There are mill steel black, hot dip Galvanizing  and stainless steel grating.

2)Usage: platform, flooring walkway,steel structures, stair tread, well cover, trench cover, sump cover,compound gratings, storage shelves, ladder, fences and handrail so on for construction project, oil project, seaport, power plant, water plant, defense project, chemical factory and so on.

3)Types: Plain Style Steel Grating, Serrated Style Steel Grating and I Bar Type Steel Grating.

4) Surface Treatment:
Untreated, Painting ,Powder coated or Hot dip Galvanizing

5)There are four kinds of stair treads T1,T2,T3,T4.

    T1         Welded fixing and Without nosing

    T2         Bolted fixing and without nosing,easy to installation and teardown.

    T3         Welded fixing and with checkered plate nosing, can be skid.

    T4         Bolted fxing and with checkered plate nosing, easy be installation,

                 teardown and can be skid.

 Notes: Stair tread may be of any types of grating,the size may be up to no standard specification
 We recommended :

 Bearing bar pitch is 30,40,60mm.

 Cross bar pitch  is 40,50,60,100mm

 Width: 125,155,185,215,245,275,305mm

6) Steel grating standards:
A) China: YB/T4001-1998
B) USA: ANSI/NAAMM (MBG531-88)
C) UK: BS4592-1987
D) Australia: AS1657-1988
E) Japan: JJS.