S-91029A107 M8 x 40 mm ISO 4017, DIN 933 Extreme-Strength Metric Class12.9 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc yellow-chromate plating extends service life in harsh industrial environments, minimizing maintenance needs.
• High hardness rating (Rockwell C39) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Full threading design offers maximum grip length and uniform load distribution for secure fastening across the entire bolt length.
• Precision external hex drive allows for high torque application and easy installation with standard tools, improving assembly efficiency.
• Coarse thread pitch (1.25mm) enables quick installation and better resistance to vibration loosening in dynamic applications.
• Class 12.9 strength rating delivers premium performance for critical applications where fastener reliability is paramount.

Professional Applications & Engineering Value

These M8 hex head screws with Class 12.9 strength rating are engineered to solve critical fastening challenges in demanding industrial environments. The steel construction combined with zinc yellow-chromate plating provides exceptional protection against corrosion while maintaining the 170,000 PSI tensile strength required for heavy machinery, structural steel connections, and automotive assemblies. The fully threaded metric coarse thread design ensures maximum engagement in both metal and high-density materials, preventing joint failure under vibration and dynamic loads. With Rockwell C39 hardness, these industrial screws maintain their structural integrity even after repeated disassembly and reassembly cycles, making them ideal for maintenance-intensive applications where reliability cannot be compromised.

Specification Summary & Compliance

This M8 x 1.25 x 40mm hex head screw features Class 6h thread fit precision and right-hand metric coarse threading with full compliance to ISO 4017/DIN 933 standards. The manufacturing process adheres to strict dimensional tolerances and quality controls, ensuring consistent performance across production batches. The zinc yellow-chromate plating meets industry standards for corrosion protection while maintaining compatibility with RoHS and REACH environmental regulations for industrial components.