M5-0.8X20 Metric DIN603 Carriage Bolt Full Thread A2 Stainless Steel (Pack Qty 2,000) BC-M520D603A2

The square neck is designed to keep the bolt from turning as a nut is tightened. Best for use in wood or thick gauge sheet metal Class 4.6 carriage bolts shall be made from a carbon steel which conforms to the following chemical composition Carbon: 0.55% maximum; Phosphorus: 0.05% maximum; Sulfur: 0.06% maximum used to fasten metal to metal or metal to wood