These premium A4 (316) Stainless Steel Cup Square Bolts are engineered for high-performance applications where durability and maximum corrosion resistance are essential. Often referred to as carriage bolts, these fasteners feature the classic domed head and square neck design, preventing the bolt from turning once tightened into wood or metal.

Manufactured to DIN 603 standards, our cup square bolts are crafted from high-grade 316 stainless steel, making them the ideal choice for marine, coastal, and industrial environments. This material ensures exceptional longevity even when exposed to harsh chemicals, saltwater, and extreme weather conditions.

Key Features & Benefits

• Superior Corrosion Resistance: The A4-grade stainless steel construction provides ultimate protection against rust and oxidation, outperforming standard steel and A2 stainless alternatives.
• Secure Fixing: The square shoulder under the cup head grips into the material, allowing for easy tightening from a single side with a nut and washer.
• Certified Quality: Produced in accordance with DIN 603 specifications to ensure consistent dimensions, high tensile strength, and reliable stability.
• Versatile Application: Perfect for structural timber work, fencing, marine construction, and heavy-duty industrial projects.

Whether you are working on a professional construction site or a specialized marine installation, these fasteners provide a secure, aesthetically pleasing finish. Their high-strength properties and resistance to rust make them a dependable solution for projects requiring long-lasting reliability and structural integrity.

Available in a comprehensive range of diameters and lengths to suit any technical requirement, these bolts ensure a precise fit and superior performance for every application.