Carbon Steel Iron Black Oxide Gr10.9 Metal Bolts With External Hexalobular Small Flange DIN 34800

These 12-point flange bolts are manufactured from high-strength carbon steel, precision-engineered to meet the stringent requirements of the DIN 34800 standard. The defining feature is the external 12-point (hexalobular) drive, which provides a significantly larger contact area than traditional hex heads, allowing for higher torque transmission without cam-out.

The integrated small flange acts as a built-in washer, distributing the clamping load evenly across the bearing surface to prevent marring and provide a secure hold. The black oxide coating offers a sleek, matte black finish that provides mild corrosion resistance and reduces light reflection, while also improving lubricity during installation. This combination of a robust material, advanced drive system, and protective finish makes these bolts ideal for applications demanding both strength and a professional appearance.

The robust Grade 10.9 strength (approximately 1040 MPa tensile strength) makes these bolts perfectly suited for high-stress applications in the automotive industry, particularly in engine assemblies, transmission components, and chassis systems where vibration and dynamic loads are prevalent.

The black oxide finish is favored in motorsport and custom automotive builds for its non-reflective properties, reducing glare under hood or in well-lit engine bays. Furthermore, the reliable performance of the DIN 34800 design makes them a trusted choice for industrial machinery assembly, heavy equipment manufacturing, and any mechanical fastening point where a compact, high-strength, and visually unobtrusive fastener is required.

The primary advantage lies in the 12-point drive system, which allows for higher torquing capabilities and reduces the risk of rounding off the head compared to hex bolts. The Grade 10.9 carbon steel provides an excellent balance of high tensile strength and good ductility, ensuring reliability under extreme loads. The integrated small flange eliminates the need for a separate flat washer, simplifying inventory and assembly. Finally, the black oxide finish not only provides a cosmetic upgrade with its uniform black appearance but also offers a base for retaining lubricating oils and a modest level of corrosion protection for indoor or protected applications.