Special shaped stair treads for spiral staircase,Spiral stair tread

1. Spiral stair tread Material:

Mild Steel (Low CaTbon Steel) or Stainless Steel

2. Types of steel grating for spiral stair tread:

-Flat type: the most widely steel grating.

-Serrated type: With better no-slip.

-"I" type: On the surface,path and items not in the same flat.With the character of light weight,economic and practical.

3.Spiral stair tread Surface Treatment:

Untreated, Painting ,Powder coated or Hot dip Galvanizing

4.Spiral stair tread welding procedure: Edge bars and attachments are welded with a minimum 3mm fllet weld to one side of:

-Every 5th load bar on Series 30 Grating

-Every 4th load bar on Series 40 Grating

-Every 3rd load bar on Series 60 Grating

-Full Weld:Weld one side of every load bar.

-Seal Weld: Weld both sides of every load bar.