Hillman 1/2-in x 12-in Galvanized Coarse Thread Hex Bolt in the Hex Bolts department at Lowes.com
Amazon.com: 4 Sets 1/2-13 x 1-1/2" Hex Head Screws Bolts, Nuts, Extra-Large and Thick Flat & Lock Washers, Fully Threaded, Stainless Steel 18-8, Bright Finish : Industrial & Scientific
1/2 in. x 4 in. Black Carriage Bolt Kit Includes 12 Bolts, 12 Washers, and
Hakkin 144PCS 1/4-20 Heavy Duty Hex Bolts and Nuts Screw, 1/4" Nuts and Bolts Machine Screws Washers Assortment Kit, Silver - Walmart.com
1/4-20 x 2-1/2" Hex Head Cap Screws Bolts and Nuts, Flat Washers, Spring Washers, Stainless Steel 18-8 (304), 10 Sets - Amazon.com
Amazon.com: Chenango Supply Stainless 1/2-13 x 2inches Hex Head Bolts (3/4inches to 5inches Lengths Available in Listing), 304 Stainless Steel, 25 Pieces (1/2-13 x 2 : Industrial & Scientific
1/2" x 4" - 304-STAINLESS STEEL BOLTS, NUTS & WASHERS - 18-8 HEX HEAD - AntiqueHardwareDepot.com