S-95440A122 M8 x 20 mm ASTM A276 Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extending service life.
• Enhanced durability and wear resistance from the black oxide finish, providing added protection against abrasion and oxidation.
• Reliable fastening performance with Class 6g thread fit, ensuring precise engagement and reducing the risk of loosening under vibration.
• High tensile strength of 70,000 psi and Rockwell B70 hardness for dependable load-bearing capacity in demanding applications.
• Efficient installation and flush seating thanks to the flat undercut head profile and 100° countersink angle, minimizing protrusion and improving aesthetics.
• Versatile hex drive design (5 mm) allows for easy torque application with standard tools, speeding up assembly processes.
• Full threading along the 20 mm length provides consistent grip and adjustment flexibility across the entire fastener.

Professional Applications & Engineering Value

This M8 flat head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and high-stress conditions. Made from 316 stainless steel and featuring a black oxide finish, it offers exceptional resistance to moisture, chemicals, and extreme temperatures, making it suitable for marine, chemical processing, and outdoor equipment. The Class 6g thread fit and coarse metric thread (M8 x 1.25mm) ensure secure fastening in metals and plastics, while the undercut flat head with a 100° countersink angle allows for a smooth, flush finish that reduces snagging and improves safety. Ideal for machinery, automotive assemblies, and structural frameworks, this screw delivers reliable performance where precision and longevity are critical.

Specification Summary & Compliance

This product adheres to precise dimensional tolerances, including a head diameter tolerance of -0.127 to 0.127 mm and Class 6g thread fit per metric standards. It is manufactured in compliance with ASTM A276 for material consistency and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.