Product Details

Our Black Non-Fully Threaded (Partially Threaded) DIN 6921 Hex Flange Head Bolts are specifically designed for demanding structural joints. The unthreaded portion of the bolt shank is engineered to bear the brunt of shear forces, making it significantly stronger and more durable in applications with side-to-side movement than a fully threaded bolt. This design ensures that the threads are not compromised by shear stress and that the joint maintains precise alignment.

These bolts are available with two distinct black surface treatments:

• Black Oxide: A conversion coating that provides moderate corrosion resistance, excellent wear resistance, and anti-galling properties. It is ideal for applications where a non-reflective, durable finish is required.
• Black Zinc: An electroplated coating that offers enhanced corrosion protection compared to black oxide, making it suitable for environments with some exposure to moisture.

Forged from high-strength carbon steel in property classes such as 8.8, 10.9, and 12.9, these bolts deliver the tensile strength required for the most critical connections. The integrated flange distributes the load over a wider area, preventing material damage and increasing resistance to loosening from vibration.

Product Parameters

The technical specifications for our Black Non-Fully Threaded DIN 6921 Hex Flange Head Bolts are detailed below.

Product Features

These bolts are engineered with several key features to ensure top-tier performance in structural applications:

• Optimized for Shear Strength: The solid, unthreaded shank provides maximum resistance to lateral forces, preventing bolt shearing and ensuring joint integrity in high-stress environments.
• Dual Protective Finish Options: Choose between a wear-resistant Black Oxide finish or a corrosion-resistant Black Zinc coating to match your application’s specific environmental and performance needs.
• Integrated Anti-Vibration Flange: The built-in flange acts as a washer to distribute clamping force, reduce surface pressure, and, when serrated, provides a mechanical lock that offers exceptional resistance to loosening from vibration.
• High-Tensile Strength: Manufactured from high-grade carbon and alloy steels (Grades 8.8, 10.9, 12.9), these bolts provide the robust clamping force necessary for critical load-bearing connections.
• DIN 6921 Standard Compliance: Guaranteed dimensional accuracy and quality control ensure that each bolt performs reliably and is fully interchangeable.

Product Applications

The superior shear strength and robust design of our Black Non-Fully Threaded Hex Flange Bolts make them indispensable in industries where safety and durability are paramount. In the Automotive Industry, they are critical for securing chassis components, engine mounts, suspension systems, and other parts subject to constant vibration and shear forces. In Heavy Machinery and Construction Equipment, they are used to assemble frames, booms, and pivot points on excavators, cranes, and bulldozers. For Transportation Equipment, these bolts provide secure connections for truck and trailer frames, ensuring structural integrity during transit. They are also a preferred choice in any structural engineering application where precise alignment and resistance to lateral loads are essential for a safe and long-lasting assembly.