SECTION 05517- ALTERNATING TREAD STEEL STAIRS
J. ASTM A554-03 – Standard Specification for Welded Stainless Steel Mechanical Tubing . K. ASTM A563-00 - Standard Specification for Carbon and Alloy Steel Nuts. L. ASTM A569/A569M-91a – Standard Specification for Steel, Carbon (.15 Maximum, Percent), Hot-Rolled Sheet and Strip Commercial Quality (superseded by A1011)