S-91223A423 M4 x 20 mm 316 Stainless Steel Ultra-Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and extended service life
• High-strength performance offering 70,000 PSI tensile strength and Rockwell B70 hardness for reliable load-bearing in demanding applications
• Precise, secure fastening ensured by the Class 6g thread fit and M4 x 0.7mm coarse thread, reducing the risk of cross-threading and enabling quick assembly
• Space-saving, flush installation with the ultra-low socket head profile and 2.5mm hex drive, perfect for compact designs and tight clearances
• Consistent dimensional accuracy with controlled head diameter tolerance (-0.127mm to 0.127mm), promoting uniform fit and repeatable assembly
• Full-threaded design for maximum grip and holding power along the entire 20mm length, enhancing joint integrity
• Compliance with environmental regulations including RoHS 3 and REACH, ensuring safe use in regulated industries and global markets

Professional Applications & Engineering Value

Engineered for precision and durability, these M4 socket head cap screws in 316 stainless steel address critical needs in industrial settings where corrosion resistance and mechanical strength are paramount. The ultra-low head profile and 2.5mm hex drive allow for flush mounting in confined spaces, such as machinery, automotive assemblies, and electronic enclosures, minimizing protrusion and improving aerodynamic or aesthetic finishes. The Class 6g thread fit and coarse 0.7mm pitch facilitate rapid installation and reduce assembly errors, while the 70,000 PSI tensile strength ensures reliable performance under vibration and dynamic loads. Ideal for metric fastening systems, these screws provide long-term reliability in demanding environments, from marine to chemical processing, by combining robust material properties with precise engineering.

Specification Summary & Compliance

This socket head cap screw adheres to metric standards with an M4 thread size, 0.7mm coarse pitch, and Class 6g thread fit for consistent dimensional accuracy. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial applications. The screw is fully threaded and features a right-hand thread direction, with a tensile strength of 70,000 PSI and Rockwell B70 hardness for dependable mechanical performance.