GRAINGER APPROVED Carriage Bolt: Square, Stainless Steel, 18-8, Plain, 5/16"-18 Thread Size, 3/4 in lg, Inch, 100 PK - 31JA86|U51500.031.0075 - Grainger
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Prime-Line 1/4 in.-20 x 1-1/2 in. A307 Garde-A Zinc Plated Steel Carriage Bolts (100-Pack) 9062222 - The Home Depot
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