Bolt head diameter: 21mm; Round head height: 5mm; Screw length (including the neck): 4 inch or 100mm
Material: 304 stainless steel (A2) and no exterior finish, greater strength and corrosion resistance performance than regular stianless steel or zinc plated fasteners.
Carriage bolts have a dome shaped head and a square neck generally requiring a hex nut and flat washer. The square neck makes them self-locking when used within a square hole.
Description
Glvaner (10 Sets) 5/16-18 x 3/4" Stainless Steel Carriage Bolts Screws Round Head Square Neck and Hex Nuts & Flat Washers 304 Stainless Steel 18-8 Full Thread Coverage