S-91263A827 M4 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 demanding applications, reducing the risk of fastener failure.
• High-grade Class 10.9 strength classification provides superior load-bearing capacity and fatigue resistance for long-term structural integrity.
• Zinc-plated alloy steel construction offers excellent corrosion resistance, extending service life in harsh industrial environments.
• Precision Class 6g thread fit guarantees smooth installation and secure fastening, minimizing assembly time and rework.
• 90° countersink angle and flat head design allows for a flush finish, enhancing safety and aesthetics in assembled products.
• Hex drive with 2.5 mm size enables high-torque application and easy installation using standard tools, improving efficiency.
• Full threading along the 8 mm length ensures maximum grip and uniform stress distribution, ideal for varied material thicknesses.

Professional Applications & Engineering Value

This M4 flat head screw is engineered to address critical challenges in heavy-duty industrial settings, where vibration, high loads, and environmental factors can compromise fastener integrity. The zinc-plated alloy steel material, combined with a Rockwell C32 hardness, resists wear and corrosion, making it suitable for machinery, automotive assemblies, and construction equipment. The coarse metric threading with a 0.7 mm pitch and Class 6g fit ensures quick, precise engagement in metals and composites, reducing the risk of cross-threading and loosening. By adhering to DIN 7991/ISO 10642 standards, it delivers consistent dimensional accuracy, enabling reliable countersunk fastening in applications demanding flush surfaces and high strength, such as frames, brackets, and enclosures.

Specification Summary & Compliance

This fastener features an M4 x 0.7 mm coarse thread with a Class 6g tolerance for precise fit, and an 8 mm fully threaded length. It meets DIN 7991 and ISO 10642 specifications for dimensional consistency and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) ensures it is free from hazardous substances, supporting environmental and safety standards in global supply chains.