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40-27 BUILDING METAL STAIRS <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />PART 2 - PRODUCTS <br />' 2.1 METALS, GENERAL <br />' A. Metal Surfaces, General: Provide materials with smooth, flat surfaces unless <br />otherwise indicated. For components exposed to view in the completed Work, provide <br />materials without seam marks, roller marks, rolled trade names, or blemishes. <br />2.2 FERROUS METALS <br />A. Recycled Content of Steel Products: Provide products with average recycled content <br />of steel products so postconsumer recycled content plus one-half of preconsumer <br />recycled content is not less than 25 percent. <br />B. Steel Plates, Shapes, and Bars: ASTM A 36/A 36M. <br />C. Steel Tubing: ASTM A 500 (cold formed) or ASTM A 513. <br />D. Rolled -Steel Floor Plate: ASTM A 786/A 786M, rolled from plate complying with <br />ASTM A 36/A 36M or ASTM A 283/A 283M, Grade C or D. <br />E. Uncoated, Cold -Rolled Steel Sheet: ASTM A 1008/A 1008M, either commercial steel, <br />Type B, or structural steel, Grade 25, unless another grade is required by design loads; <br />exposed. <br />2.3 FASTENERS <br />A. General: Provide zinc -plated fasteners with coating complying with ASTM B 633 or <br />ASTM F 1941, Class Fe/Zn 12 for exterior use, and Class Fe/Zn 5 where built into <br />exterior walls. Select fasteners for type, grade, and class required. <br />B. Bolts and Nuts: Regular hexagon -head bolts, ASTM A 307, Grade A; with hex nuts, <br />ASTM A 563; and, where indicated, flat washers. <br />C. Anchor Bolts: ASTM F 1554, Grade 36, of dimensions indicated; with nuts, <br />ASTM A 563; and, where indicated, flat washers. <br />D. Machine Screws: ASME B18.6.3. <br />E. Lag Screws: ASME B18.2.1. <br />F. Plain Washers: Round, ASME B18.22.1. <br />G. Lock Washers: Helical, spring type, ASME B18.21.1. <br />H. Post -Installed Anchors: Chemical anchors capable of sustaining, without failure, a load <br />equal to six times the load imposed when installed in unit masonry and four times the <br />load imposed when installed in concrete, as determined by testing according to <br />ASTM E 488, conducted by a qualified independent testing agency. <br />C06922.001.00 0551 00 - 3 <br />1 <br />05-22-14 <br />