S-92220A123 4-40 x 1/2" ASTM A574 Alloy Steel Low-Profile Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with 140,000 psi tensile strength and Rockwell C39 hardness, ensuring reliable performance in demanding applications.
• Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in various industrial environments.
• Precise and secure fastening achieved with Class 3A thread fit and UNC coarse threads, reducing the risk of loosening under vibration.
• Space-saving low profile head design allows installation in tight spaces where clearance is limited, without compromising on drive engagement.
• Easy installation and removal with a hex drive (0.050"), providing a secure tool grip and minimizing stripping risks.
• Full thread coverage along the 1/2" length ensures consistent clamping force and versatility in assembly depth.
• Compliance with industry standards including ASTM A574, RoHS 3, and REACH, guaranteeing quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 4-40 UNC Thread Socket Head Cap Screw is engineered to address common industrial challenges such as space constraints and high-stress conditions. The low profile socket head and compact dimensions make it ideal for precision equipment, electronics, and machinery where minimal protrusion is critical. Constructed from black-oxide alloy steel, it offers enhanced resistance to rust and wear, ensuring longevity in harsh environments. The Class 3A thread fit and coarse UNC threads provide reliable engagement, reducing the likelihood of cross-threading and maintaining clamp load under dynamic loads. With a fully threaded design and high tensile strength, it delivers consistent performance in applications ranging from automotive assemblies to aerospace components, supporting efficient maintenance and reduced downtime.

Specification Summary & Compliance

This socket head cap screw features precise Class 3A thread fit with 4-40 UNC coarse threads and a right-hand thread direction, ensuring dimensional accuracy per inch system standards. It complies with ASTM A574 specifications for high-strength alloy steel fasteners, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety and hazardous substance restrictions.