Spiral Staircase Metal/ ISO Serrated Stair Treads Grating

Model NO.: T1 T2 T3 T4

Type: T1, T2, T3, T4

Installation: Bolted, Welded

Quality Certificate: ISO9001

Quality Standard: UK, Au, Ja, Euro

Surface Treatment: Mill Finish, Galvanized, Painted, PVC

Trademark: Jiuwang

Transport Package: Steel Belt

Specification: ISO9001

Origin: Hebei Anping

HS Code: 730890

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1.Profile

We manufacture different styles of stair ladders that used in family,industry and construction.Â

Material:Â mill steel black and hot dip Galvanizing /Â and stainless grating

Usage:Â 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.

Spiral Staircase Metal/ ISO Serrated Stair Treads Grating

1)There areÂ four kindsÂ of stair treads T1,T2,T3,T4.

Â Â Â Â T1Â Â Â Â Â Â Â Â Â Welded fixing and Without nosing

Â Â Â Â T2Â Â Â Â Â Â Â Â Â Bolted fixing and without nosing,easy to installation and teardown.

Â Â Â Â T3Â Â Â Â Â Â Â Â Â Welded fixing and with checkered plate nosing, can be skid.

Â Â Â Â T4Â Â Â Â Â Â Â Â Â Bolted fxing and with checkered plate nosing, easy be installation,

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â teardown and can be skid.

2) Material:Â Mild Steel (Low Carbon Steel) or Stainless Steel

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

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

3.steel stair treads specification

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

Spiral Staircase Metal/ ISO Serrated Stair Treads Grating

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

Note:bearing bar thickness 5mm

Â 4.steel stair treads introductionÂ Â

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

Note:bearing bar thickness 5mm

Â 4.steel stair treads introductionÂ Â

Spiral Staircase Metal/ ISO Serrated Stair Treads Grating

5.company file