S-91304A157 M8 x 40 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 tensile strength (120,000 psi) for reliable performance in high-stress industrial applications.
• Superior corrosion resistance thanks to blue-dyed zinc plating on alloy steel, extending service life in harsh environments.
• Precise 90° countersink angle ensures a flush, secure fit that minimizes protrusion and improves safety in assembled structures.
• Optimized hex drive design (5 mm) provides efficient torque transmission and reduces tool slippage during installation.
• Coarse M8 x 1.25 mm threading (Class 6g fit) enables quick assembly and strong holding power in various materials.
• Full threading along the 40 mm length offers maximum grip and adjustability for versatile fastening needs.
• Compliance with DIN 7991, RoHS 3, and REACH standards guarantees product safety, environmental responsibility, and international acceptance.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these M8 flat head screws address critical challenges like vibration loosening and material fatigue. The Class 10.9 high tensile strength and Rockwell C32 hardness ensure durability under dynamic loads, making them ideal for machinery, automotive assemblies, and structural frameworks. The blue-dyed zinc-plated alloy steel construction not only resists corrosion but also allows for easy visual identification in inventory management. With a standard 90° countersink angle and fully threaded coarse pitch design, they provide rapid, secure fastening in metal, wood, and composite substrates, reducing installation time and maintenance costs.

Specification Summary & Compliance

This metric flat head screw features precise M8 x 1.25 mm coarse threads with a Class 6g tolerance for consistent fit. It adheres to DIN 7991 (equivalent to ISO 10642) manufacturing specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no hazardous substances are used. The 40 mm length and right-hand threading support standardized assembly processes across global industries.