S-91263A456 M5 x 50 mm DIN 7991 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional durability with Class 12.9 strength rating and 170,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc-plated alloy steel construction, extending service life in harsh environments
• Precise installation control with 3mm hex drive design that prevents stripping and ensures secure fastening
• Optimized thread engagement through M5 coarse threading with 0.8mm pitch for faster assembly and reduced cross-threading risk
• Flush mounting capability with standard 90° flat head profile that sits perfectly countersunk for clean, professional finishes
• Consistent quality assurance with Class 5g6g thread fit tolerance ensuring reliable mating with nuts and threaded holes
• Environmental compliance meeting RoHS 3 and REACH standards for safe use across regulated industries

Professional Applications & Engineering Value

These high-strength metric flat head screws deliver exceptional engineering value in heavy-duty industrial applications where reliability is paramount. The zinc-plated alloy steel construction provides superior corrosion protection while maintaining the Class 12.9 strength rating required for critical structural connections. The M5 coarse threading with 0.8mm pitch ensures rapid installation and reduces the risk of cross-threading in production environments. The partially threaded design allows for precise clamping force distribution, making these hex drive screws ideal for machinery assembly, automotive components, and industrial equipment where vibration resistance and long-term performance are essential. The flat head profile with 90° countersink angle creates seamless surface finishes while the 3mm hex drive prevents tool slippage during high-torque applications.

Specification Summary & Compliance

This M5 flat head screw features precise Class 5g6g thread fit tolerance according to metric standards, ensuring consistent performance across applications. The fastener complies with DIN 7991 specifications for dimensional accuracy and mechanical properties. Manufacturing follows strict quality control to maintain the Rockwell C39 hardness and 170,000 psi tensile strength characteristics. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, making these screws suitable for use in regulated industries and international markets.