galvanized steel outdoor stairs
1. Steel Grating Stairs Standardizations:
National Standards for Grating
2. Steel Grating Stairs Bearing Bar Sizes: 1"x1/8",1-1/4"x1/8",1-1/4"x3/16",1-1/2"x3/16",2"x3/16",2"x1/4" etc.
3. Steel Grating Stairs Bearing Bar Pitches:12.5mm,15mm,24mm,25mm,30mm,30.16mm(1-3/16"),32.5mm,34.33mm,35.33mm,38mm,40mm,41.25mm,50mm,60mm
4. Steel Grating Stairs Cross Bar Pitches: 38.1mm, 50mm, 75mm, and 100mm,101.6mm(4") etc.
5. Steel Grating Stairs Standard Grating Panels Sizes: 3'x12', 3'x20', 3'x24' etc.
The detail spcification of stair tread can be produced according to customers request!
6. Steel Grating Stairs Surface Treatment: Paint and Hot Dipped Galvanized or Untreatment.
7.There are three kinds of steel gratings distinguished by different bearing bar types.The respective of features are as follows:
Plain:One of the most widely used gratings,available for flooring,sidewalk,dranage pit cover,stair tread,etc.
Serrated:Better non-skid property & safety compared with plain grating.
I-Shape: lighter,more economical and practical compared with plain grating.
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