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ePaper created 2014-06-10, 18:20:17 | version 1.30.01
TECHNICAL SPECIFICATIONS MATERIAL: SHAPE: FINISH: HOLES: TELESCOPING PROPERTIES: 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. The cross section of 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. 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. 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. 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. NOMINAL OUTSIDE AVAILABLE SQUARENESS TWIST PERMISSIBLE OUTSIDE TOLERANCES DIMENSION GAUGES TOLERANCE IN 3' LENGTH AT CORNERS (ALL SIDES) Measurements are made at least 2" from the end of the tube. Permissible variation in wall thickness is +.011", -.005". The length of each post shall have a permissible length tolerance of ± 1/4". As measured in the center of the flat sides, shall not exceed ± .010", determined at the corner. Standard outside radii shall be 5/32", with variation of ± 1/32". Permissible variation in straightness is 3/16" in a 10 foot section. TOLERANCES Outside Dimensions: Wall Thickness: Length: Convexity and Concavity: Corner Radii: Straightness: 10 12 14 (.134") (.109") (.083") 1-1/2" x 1-1/2" X X ± .009" .050" ± .006" 1-3/4" x 1-3/4" X X ± .011" .062" ± .008" 2" X 2" X X ± .012" .062" ± .008" 2-1/4" x 2-1/4" X X ± .014" .062" ± .010" 2-1/2" x 2-1/2" X X ± .015" .075" ± .010" PERFORATED SQUARE STEEL SIGNPOSTS