Specifications of Stair Tread:
1. Size: tread length by width, the length direction of tread refers to the width direction of ladder
2. Material: Q235 in line with GB/T700 steel, steel or stainless steel
3. Surface treatment: Hot-dip galvanizing, paint or other anti-corrosive coatings are available, of which hot-dip galvanizing is generally recommended
4. Standards: YB/T4001.1-2007, ANSI/NAAMM, BS4592, AS1657 5. Bearing bar pitches can be 12.5, 15, 20, 30, 30.16, 32.5, 34.3, 40, 60mm, of which 30mm & 40mmare recommended

6. Cross bar pitches can be 38, 50, 60,100mm, of which 50mm & 100mm are recommended

Features of Stair Tread:
- Easy installation
- Strong structure
- Aesthetic appearance
- Good water permeability
- Quality assurance

Stair treads is divided into four models due to whether the front checkered plate and the mode of connection with ladder beam , 

labeled T1,T2, T3,T4,T5,T6.

T1:Welding fixing stair tread without front plate.
T2:Bolt fastening stair tread without front.
T3:Welding fixing stair tread with front checkered  plate.
T4:Bolt fastening stair tread with front checkered plate.
T5:Welding fixing stair tread without front Anti-slip strip.
T6:Bolt fastening stair tread with front Anti-slip strip.
Item
Description
Bearing bar
20x5, 25x3, 25x4, 25x5, 30x3, 30x4, 30x5, 32x3, 32x5, 40x5, 50…75x8mm, etc.
US standard: 1''x3/16'', 1 1/4''x3/16'', 1 1/2''x3/16'', 1''x1/4'', 1 1/4''x1/4'', 1 1/2''x1/4'', 1''x1/8'', 1 1/4''x1/8'', 1 1/2''x1/8'' etc
Bearing bar pitch
25, 30, 30.16, 32.5, 34.3, 40, 50, 60, 62, 65mm, etc.
US standard: 19-w-4, 15-w-4, 11-w-4, 19-w-2, 15-w-2 etc.
Cross bar
5x5, 6x6, 8x8mm (twisted bar or round bar)
Cross bar pitch
40, 50, 60, 65,76,100,101.6,120,130mm or as customers’ requirement.
Flat bar type
Plain, Serrated (tooth-like), I bar (I section)
Materials
Low carbon steel (Q275/Q235/Q195,ASTM A36, A1011, A569, S275JR, SS304, SS400,UK: 43A),Stainless steel,aluminum alloy,etc
Galvanizing standard
CN: GB/T13912, US: ASTM (A123), UK: BS729
Steel grating standards
A. China: YB/T4001-1998
B. USA: ANSI/NAAMM (MBG 531-88)
C. UK: BS4592-1987
D. Australia: AS1657-1988
E. Japan: JJS
Surface treatment
Black,Electro galvanized(Cold dip galvanized),Hot dipped galvanized,Painted,Powder coated,or as customers’ requirements.And hot dipped galvanizing is generally recommended.

Types of Stair Tread

8 Standard types of stair tread, with welded fixing and bolted fixing, different nosing forhead, we also accept customization according to your different requirement.

Packaging for Stair Tread:

Shanghai Metal Products are packed and labeled according to the regulations and customer’s requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of the product I.D. and quality information. 

Shanghai Metal  provides the customer with standard seaworthy pacakging, steel grating product standard packaging with wooden pallet and flat steel strip fixed.

Manufacturing of Stair Tread:

Material-welding-cutting-end plate welding-surface treatment-final shipment