Material
Steel posts furnished shall conform to ASTM A653 Grade 50, Standard Specification for Steel Sheet, Zinc Coated (Galvanized) or Zinc-Iron Alloy Coated (Galvannealed) by the Hot-Dip Process.
Shape
The cross section on the post shall be carbon steel tube formed to square and welded directly in the corner by high frequency electric resistance welding and externally scarfed to match the corner radii.
Finish
The galvanized part will conform to ASTM A653, G90, Structural Quality, Grade 50. The corner weld is zinc coated after scarfing. The galvanized post has a minimum of 0.5 mil of clear acrylic polymer coating applied as a rust preventative.
Holes
All four sides feature holes that shall be 7/16” diameter, (± 1/64”) on one-inch centers through the entire length of the post. Holes shall be on the centerline of each side, in alignment with and opposite each other directly and diagonally.
Telescoping Properties
The finished post shall be straight and have a smooth, uniform finish. All consecutive sizes of square tubes shall telescope freely and for not less than ten feet of their length without the need to match any particular face to any other face. All holes and ends shall be free from burrs.
