S-91304A111 M4 x 8 mm DIN 7991, ISO 10642 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with Class 10.9 strength rating and 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through blue-dyed zinc plating that provides both aesthetic identification and enhanced environmental protection
• Precise countersinking capability with 90° flat head profile ensuring flush mounting and clean finished appearance
• Optimized installation efficiency featuring 2.5mm hex drive for secure tool engagement and reduced stripping risk
• Robust thread engagement with fully threaded coarse pitch (M4 x 0.7mm) design for faster assembly and strong holding power
• Consistent dimensional accuracy maintained through Class 6g thread fit tolerance for reliable interchangeability
• Extended service life supported by Rockwell C32 hardness for excellent wear resistance and durability

Professional Applications & Engineering Value

These M4 flat head screws deliver critical engineering solutions for industrial applications requiring both high strength and flush mounting capabilities. The Class 10.9 alloy steel construction provides exceptional structural integrity for machinery, equipment frames, and automotive components where vibration resistance is paramount. The blue-dyed zinc plating offers superior corrosion protection while allowing for visual identification in complex assemblies. With fully threaded coarse pitch design and 2.5mm hex drive, these screws enable rapid installation and secure fastening in materials ranging from steel to high-density plastics. The 90° countersink angle ensures perfect flush mounting for applications where surface smoothness and aerodynamic profiles are essential, making them ideal for manufacturing, automation systems, and precision equipment requiring DIN 7991/ISO 10642 compliance.

Specification Summary & Compliance

Manufactured to precise metric dimensions with Class 6g thread fit tolerance ensuring consistent performance and interchangeability. These screws conform to DIN 7991 and ISO 10642 standards for flat head screw specifications, featuring M4 x 0.7mm coarse thread with right-hand threading. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, making them suitable for global industrial applications with strict regulatory standards.