Spiral Stair Treads From Real Manufacture

 

1.Profile
We manufacture different styles of stair ladders that used in family,industry and construction. 
Material: mill steel black and hot dip Galvanizing / and stainless grating
Usage: ladder, flooring walkway, platform ,steel structures, stair tread, well cover, trench cover, sump cover,compound gratings, storage shelves,fences and handrail so on for construction project, oil project, seaport, power plant, water plant, defense project, chemical factory and so on.
 
2.steel stair treads type.
 
1)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.

2) Material: Mild Steel (Low Carbon Steel) or Stainless Steel
3) Surface Treatment: 
Untreated, Painting ,Powder coated or Hot dip Galvanizing
4) 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
 
3.steel stair treads specification

Pitch of Bearing bar	Cross-bar Pitch	Specification of bearing bar load(width×thickness)
		32×5	40×5	45×5	50×5	55×5	60×5
30	100	G325/30/100	G405/30/100	G455/30/100	G505/30/100	G555/30/100	G605/30/100
	50	G325/30/50	G405/30/50	G455/30/50	G505/30/50	G555/30/50	G605/30/50
40	100	G325/40/100	G405/40/100	G455/40/100	G505/40/100	G555/40/100	G605/40/100
	50	G325/40/50	G405/40/50	G455/40/50	G505/40/50	G555/40/50	G605/40/50
60	50	G325/60/50	G405/60/50	G455/60/50	G505/60/50	G555/60/50	G605/60/50

 
Max. Stair treads lengths
 

Steel grating specification Bearing bar size	25*3	25*5	32*5
Bearing bar pitch30mm	550	900	1300
Bearing bar pitch 40mm	450	750	1200

 
Recommend stair tread widths
 

T1,T2,T3,T4 Bearing bar pitch 30mm	95	125	155	185	215	245	275
T1,T2,T3,T4 Bearing bar pitch 40mm		125	165		205	245	285
		115	155		195	235	275
Fixing hole centers	45		75		100		150

 
Note:bearing bar thickness 5mm
 4.steel stair treads introduction  
   
Recommend stair tread widths
 

T1,T2,T3,T4 Bearing bar pitch 30mm	95	125	155	185	215	245	275
T1,T2,T3,T4 Bearing bar pitch 40mm		125	165		205	245	285
		115	155		195	235	275
Fixing hole centers	45		75		100		150

 
Note:bearing bar thickness 5mm
 4.steel stair treads introduction