Hillman 1/4-in x 1/2-in Zinc-Plated Coarse Thread Hex Bolt in the Hex Bolts department at Lowes.com
Everbilt M8-1.25 x 30 mm Class 10.9 Zinc Plated Hex Bolt (2-Pack) 802248 - The Home Depot
What is Hex Bolt? Uses, Dimensions and Properties
Amazon.com: 5/16-18 x 1-1/2" Hex Head Cap Screw Bolts, External Hex Drive, Stainless Steel 18-8, Full Thread, Bright Finish, Flat Point, Quantity 25 by Fastenere : Industrial & Scientific