The Stainless Steel Carriage Bolt (often referred to as a coach bolt) is a specialized fastener designed for security and ease of installation. Characterized by its smooth, domed head and a square section underneath, the round head square neck carriage bolt is engineered to self-lock into wood or square holes in metal, preventing rotation during tightening.
Our collection meets the rigorous DIN603 standard and includes various head styles, such as the standard large round head and half-round head carriage bolts. Manufactured from high-grade 304 Stainless Steel and 316 Stainless Steel, these bolts offer exceptional corrosion resistance, making them ideal for outdoor construction, marine environments, and heavy machinery.
Q1: What is the purpose of the square neck on a carriage bolt?
A: The square neck is located directly under the rounded head. When the bolt is inserted into a square hole or pulled into wood, the neck locks in place, preventing the Stainless Steel Carriage Bolt from spinning while you tighten the nut from the other side.
Q3: Do you offer sizes larger than M12?
A: Yes. While standard sizes like M6, M8, M10, and M12 are most common, we can manufacture and supply large sizes for heavy structural applications upon request.
Q3: Are these bolts suitable for security applications?
A: Yes. Because the round head square neck carriage bolt has a smooth, domed head with no drive (slot or hex), it cannot be unscrewed from the outer side, making it an excellent choice for security fencing, playground equipment, and public infrastructure.
