1/2"-13 x 2-1/2" 18-8 Stainless Steel Coarse Thread Carriage Bolts 4PK The square section grips into the part being fixed (typically wood), preventing the bolt from turning when the nut is tightened..
Especially useful in metal-to-metal or where heavy duty fastening is required. Machine screws are used in fastening nearly all types of hard materials.
Especially useful in metal-to-metal or where heavy duty fastening is required.1/4"-20 x 1 in Phillips Pan Machine Screw, Zinc Plated Steel, 100 PK Commonly used with flat or lockwashers.