A three-quarter-inch by nine-inch wood seat board and a three-quarter-inch by seven-and-seven-eighth-inch front riser are fastened to structural brackets using one-quarter-twenty by one-and-one-quarter-inch stepbolts with locknuts. The support brackets occur at a maximum of thirty-six inches on center throughout the seating area, carrying a plywood deck. Additional connection details reference detail one on sheet D3 and brackets spaced at thirty-six inches maximum centers.
1 D3 1 D1 9 5/8" RISE 11 5/8" RISE 2 D1 B D1 A D1 3/4" x 9" SEAT BOARD 1/4-20 x 1 1/4" STEPBOLT W/LOCKNUT PLYWOOD DECK 3/8" x 1" (36" MAX O.C.) FRONT RISER 3/4" x 7 7/8" 1/4-20 x 1 1/4" STEPBOLT W/LOCKNUT DETAIL OF WOOD SEAT ASSEMBLY A D3 BRACKET 1/D3 OCCURS AT 36" MAX. CENTERS THROUGHOUT SEATING AREA c ) I 0 J T - E 5
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