S-91304A121 M5 x 8 mm DIN 7991, ISO 10642 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from blue-dyed zinc plating on alloy steel, extending service life in harsh environments and minimizing maintenance needs.
• Precision coarse threading (M5 x 0.8mm) with Class 6g fit allows for quick, secure installation and easy disassembly, saving time on assembly lines.
• High hardness (Rockwell C32) and Class 10.9 strength grade provide excellent durability and resistance to wear, ideal for heavy-duty machinery.
• Standard 90° countersink angle and flat head design enables flush mounting, enhancing safety and aesthetics in finished products.
• Hex drive (3mm) offers secure tool engagement and high torque application, preventing stripping and ensuring consistent fastening.
• Full compliance with DIN 7991/ISO 10642 standards guarantees dimensional accuracy and interchangeability, streamlining procurement and quality control.

Professional Applications & Engineering Value

This M5 flat head screw is engineered to address critical challenges in industrial fastening, where vibration, heavy loads, and corrosive conditions are common. The blue-dyed zinc-plated alloy steel construction not only provides a distinctive identification but also enhances corrosion resistance, making it suitable for outdoor equipment, automotive assemblies, and machinery exposed to moisture. With its coarse thread (0.8mm pitch) and Class 6g thread fit, it ensures rapid installation and reliable grip in materials like metal and plastic, reducing assembly time and improving productivity. The hex drive design allows for high-torque applications without slippage, while the flat head profile and 90° countersink enable seamless integration into surfaces, preventing protrusions that could cause injury or interference. Ideal for heavy-duty industrial applications, this screw delivers consistent performance under stress, backed by Class 10.9 strength and full threading for maximum holding power.

Specification Summary & Compliance

This fastener adheres to precise metric dimensions, including an M5 thread size with 0.8mm pitch and 8mm length, manufactured to Class 6g thread tolerance for reliable fit. It meets DIN 7991 and ISO 10642 specifications for flat head screws with hex drive, ensuring consistency and safety in engineering applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms it is free from hazardous substances, supporting environmental and workplace safety standards.