20 Sets 5/16-18 x 1" Black Carriage Bolts Screws and Hex Nuts & Flat Washers, 304 Stainless Steel 18-8, Round Head Square Neck, Full Thread Coverage

20 Sets 5/16-18 x 1" Black Carriage Bolts Screws and Hex Nuts & Flat Washers, 304 Stainless Steel 18-8, Round Head Square Neck, Full Thread Coverage

Package Includes: 20 Pcs Carriage Bolts (5/16-18 x 1") + 20 Pcs Hex Nuts (5/16"-18)+ 20 Pcs 5/16" Inside Diameter Flat Washers Thread Size: 5/16-18; Thread Pitch: 18 TPI; Thread Type: Coarse Thread Material: 304 Stainless Steel (A2-70) with durable black coating; Provides enhanced strength and superior corrosion resistance compared to standard stainless steel or zinc-plated fasteners; Features smooth, burr-free surfaces with scratch-resistant protection during handling and installation; Maintains a uniform industrial-grade black finish for professional applications Bolt head diameter: 0.71 inch (18mm); Bolt head height: 0.17 inch (4.47mm); Bolt length (including the square neck): 1 inch (25mm) Carriage bolts feature a domed head with integrated square neck; The square neck mechanically locks into square receiver holes, preventing rotation; The polished dome head creates a semi-recessed installation profile, blending functional grip security with reduced surface protrusion for enhanced safety in woodworking, structural connections, and agricultural equipment applications