S-91263A875 M4 x 40 mm DIN 7991 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Tensile Strength – Class 10.9 rating and 120,000 psi tensile strength ensure reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior Corrosion Resistance – Zinc-plated alloy steel construction provides durable protection against rust and environmental degradation, extending service life in harsh industrial settings.
• Precision Thread Fit – Class 6g coarse thread with 0.7 mm pitch offers easy installation and secure, vibration-resistant connections in metal and composite materials.
• High Wear Resistance – Rockwell C32 hardness maintains thread integrity and head durability, minimizing wear during repeated assembly and disassembly.
• Efficient Hex Drive Design – 2.5 mm hex drive allows for high-torque application with standard tools, speeding up installation while preventing stripping.
• Full Thread Engagement – Fully threaded M4 x 40mm design ensures maximum grip length and uniform load distribution across the entire fastener.
• Regulatory Compliance – Meets DIN 7991 specifications and RoHS 3/REACH environmental standards, guaranteeing safe, approved use in global industrial markets.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these M4 flat head hex screws solve critical challenges in machinery assembly, automotive components, and structural frameworks. The zinc-plated alloy steel material combats corrosion in humid or outdoor environments, while the Class 10.9 strength grade handles dynamic loads and vibrations without loosening. The flat head profile with 90° countersink sits flush in pre-drilled holes, eliminating protrusions for streamlined designs. Combined with a coarse metric thread and fully threaded shank, these screws provide rapid installation and robust clamping force, reducing assembly time and maintenance needs in high-performance fastener systems.

Specification Summary & Compliance

This M4 x 0.7mm x 40mm screw features a Class 6g thread fit per ISO metric standards, ensuring precise dimensional accuracy for consistent performance. Manufacturing adheres to DIN 7991 specifications, with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. The right-hand thread direction and standard flat head profile align with global engineering requirements for reliable, interchangeable use in professional fastener applications.