The stair tread is secured to the stair stringer with a three-eighths-inch diameter zinc-plated bolt. Zinc-plated washers are installed on each side of the connection. A zinc-plated nylon-insert lock nut secures the bolt.
STAIR TREAD STAIR STRINGER BOLT, Ø 3/8", ZINC-PLATED WASHER, EA SIDE, ZINC-PLATED NUT, NYLON-INSERT LOCK NUT, ZINC-PLATED
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