Product Details

Our Black Oxide Carriage Bolts are manufactured to the precise DIN 603 standard and are characterized by their specialized design and finish.

• DIN 603 Design: The defining feature of this bolt is its head design. It consists of a smooth, rounded dome head with no drive recess, providing a safe, snag-free surface. Directly beneath the head is an integral square neck. When the bolt is installed into a square hole in metal or driven into a round hole in wood, this neck embeds itself, effectively locking the bolt in place and preventing it from turning as the nut is tightened. This allows for convenient one-sided assembly with a single wrench.
• Carbon Steel Material: These bolts are crafted from high-quality carbon steel and are available in a wide range of property classes, including 4.8, 8.8, 10.9, and 12.9. This selection allows you to choose the appropriate tensile strength for your project, from general-purpose light-duty applications (Grade 4.8) to high-stress structural connections (Grade 8.8 and higher).
• Black Oxide Coating: The bolts are treated with a black oxide conversion coating. This process creates a chemically altered surface layer that provides a visually appealing matte black finish. It offers mild corrosion and wear resistance, making it suitable for indoor or dry environments. For enhanced protection, the coating readily accepts rust-preventative oils.

Product Parameters

The technical specifications for our Black Oxide Coated DIN 603 Carriage Bolts are provided below for your procurement and engineering needs.

Product Features

These bolts are engineered with several key features to deliver security, convenience, and a professional finish:

• Self-Locking Anti-Rotation Neck: The square neck securely locks into the workpiece, allowing for easy tightening of the nut without needing to hold the bolt head.
• Smooth, Safe Head Design: The low-profile dome head provides a clean, finished appearance and is free of sharp edges, making it ideal for applications in public areas or on furniture.
• Simple Security: Because the head cannot be turned with common tools, it offers a degree of tamper resistance for securing gates, shed doors, and other fixtures.
• Aesthetic Matte Black Finish: The black oxide coating provides a visually appealing, non-reflective finish that is perfect for decorative hardware, restoration projects, or when a dark fastener is required.
• Versatile Strength Options: Available in multiple strength grades to match the load requirements of everything from garden benches to heavy timber construction.
• DIN 603 Standard Compliance: Manufactured to precise international standards, guaranteeing dimensional accuracy, consistent quality, and reliable performance.

Product Applications

The unique design of the carriage bolt makes it exceptionally well-suited for a variety of applications, especially in woodworking and construction:

• Woodworking & Timber Construction: The primary application for carriage bolts. Ideal for joining timbers in decks, pergolas, playground equipment, and timber framing.
• Fencing and Gates: Widely used to attach fence panels to posts and to secure gate hinges and latches, where the smooth head faces outward for safety and security.
• Furniture Assembly: Provides strong, durable joints in the construction of benches, tables, and other rustic or heavy-duty furniture.
• Decorative Hardware: The black oxide finish makes these bolts a popular choice for projects where the fastener is a visible design element, such as in rustic or industrial-style decor.
• Automotive Restoration: Used in classic car and truck restoration for applications that originally called for this style of bolt.