S-91263A442 M4 x 5 mm DIN 7991 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: Class 12.9 strength rating and 170,000 psi tensile strength ensure reliable performance under high-stress conditions.
• Superior Corrosion Resistance: Zinc-plated alloy steel construction provides a durable protective barrier against rust and environmental degradation.
• Optimized for High-Torque Applications: The 2.5 mm hex socket drive allows for secure tool engagement and efficient installation without cam-out.
• Flush and Secure Fastening: The standard flat head with a 90° countersink angle sits perfectly flush with surfaces, preventing snagging and improving safety.
• Robust Thread Engagement: Fully threaded coarse pitch (M4 x 0.7mm) design ensures a strong, reliable hold in a wide range of materials.
• Guaranteed Dimensional Precision: Manufactured to DIN 7991 standards with a Class 5g6g thread fit for consistent quality and interchangeability.
• Compliant for Global Use: Meets RoHS 3 and REACH environmental regulations, making them suitable for international industrial supply chains.

Professional Applications & Engineering Value

This M4 flat head hex socket screw is engineered to solve critical challenges in demanding assembly environments. The Class 12.9 alloy steel core, hardened to Rockwell C39, provides the structural integrity needed to resist shear and tensile forces in heavy machinery, automotive subsystems, and high-vibration equipment. The zinc plating offers essential corrosion protection, extending service life in harsh conditions. The combination of a flat head with a 90° countersink angle and a 2.5 mm hex drive allows for a clean, flush finish and high-torque installation, which is crucial for maintaining aerodynamic profiles in enclosures or ensuring safety on moving parts. Its fully threaded, coarse pitch design ensures maximum grip in both metal and high-density plastic components, providing engineers with a versatile and highly reliable metric fastener for critical applications.

Specification Summary & Compliance

This screw conforms to the dimensional and mechanical specifications of DIN 7991. The metric thread has a size of M4 x 0.7mm with a Class 5g6g thread fit, ensuring high precision and interchangeability. It is a right-hand threaded, fully threaded fastener. The product is verified to be compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industrial markets.