S-91263A869 M4 x 18 mm DIN 7991 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.
• Corrosion-resistant zinc plating on alloy steel enhances durability and longevity, even in harsh or outdoor environments.
• Class 10.9 strength grade provides superior load-bearing capacity, ideal for critical assemblies requiring high mechanical integrity.
• Fully threaded design with Class 6g fit offers consistent engagement and secure fastening across the entire length, minimizing loosening.
• 90° countersink angle and flat head profile allow for a flush, unobtrusive finish, improving safety and aesthetics in assembled products.
• Hex drive (2.5 mm) enables easy installation and removal with standard tools, speeding up assembly processes and reducing labor time.
• Compliance with DIN 7991, RoHS 3, and REACH ensures adherence to international quality and environmental standards, supporting global supply chain requirements.

Professional Applications & Engineering Value

This M4 flat head screw is engineered from zinc-plated alloy steel to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. The coarse thread with a 0.7 mm pitch and Class 6g thread fit ensures quick, secure installation in metals and composites, reducing assembly errors. With a Rockwell C32 hardness and fully threaded shank, it provides uniform stress distribution, making it ideal for machinery, automotive components, and structural frameworks where high tensile strength and reliability are critical. The flat head design with a standard profile facilitates seamless integration into countersunk holes, enhancing both performance and safety in professional applications.

Specification Summary & Compliance

This fastener features precise metric dimensions: M4 x 0.7 mm thread with Class 6g tolerance, 18 mm length, and 90° countersink angle. It conforms to DIN 7991 manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material quality for industrial use.