S-91263A477 M8 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 high-stress environments
• Superior corrosion resistance provided by zinc-plated alloy steel construction, extending service life in harsh industrial conditions
• Precise thread engagement with Class 5g6g thread fit ensuring secure fastening and vibration resistance
• Optimized drive performance through 5mm hex drive design for efficient installation and high torque application
• Versatile partial threading allowing for both clamping force and alignment flexibility in assembly applications
• Industry-standard compliance with DIN 7991 specifications for guaranteed dimensional accuracy and interchangeability
• Environmental responsibility through RoHS 3 and REACH compliance, meeting modern regulatory requirements

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these M8 flat head screws deliver exceptional performance where reliability is critical. The zinc-plated alloy steel construction provides superior corrosion protection in automotive, heavy machinery, and manufacturing environments. With 170,000 psi tensile strength and Rockwell C39 hardness, these fasteners withstand extreme loads and vibrations that would compromise standard fasteners. The coarse thread spacing with 1.25mm pitch ensures quick installation and reduced cross-threading risks, while the partial threading design offers optimal clamp load distribution. The 90° countersink angle provides flush mounting in precision applications, making these Class 12.9 metric screws ideal for structural assemblies requiring both strength and dimensional accuracy.

Specification Summary & Compliance

This M8 x 1.25mm flat head screw features precise Class 5g6g thread fit tolerance according to ISO standards, ensuring consistent performance across applications. Manufacturing strictly adheres to DIN 7991 specifications for dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, containing no restricted substances. With 22mm minimum thread length and 50mm overall length, these screws maintain strict quality control from material selection through final plating process.