S-90044A356 1/4"-28 x 3" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, maintaining secure connections in machinery and equipment.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending service life in harsh industrial environments.
• Fine UNRF thread spacing allows for accurate adjustments and improved load distribution, ideal for precision assemblies requiring fine-tuning.
• Fully threaded design ensures consistent holding power along the entire length, simplifying installation and providing uniform clamping force.
• Rockwell C37 hardness delivers excellent wear resistance, minimizing deformation and maintaining thread integrity over repeated use.
• Hex socket drive enables easy installation with standard tools, reducing assembly time and improving efficiency in production lines.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration loosening and corrosion-induced failures. The UNRF fine thread and Class 3A fit provide tight tolerances that prevent back-off in dynamic systems, making it ideal for precision machinery, automotive assemblies, and aerospace components. The high tensile strength and hardness rating ensure durability under heavy loads, while the black-oxide surface treatment protects against rust in humid or abrasive settings. By combining robust material properties with exacting thread standards, this fastener delivers reliable performance in applications where safety and longevity are critical, reducing maintenance downtime and enhancing operational efficiency.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy and features a 1/4"-28 UNRF fine thread with right-hand orientation. It meets ASTM A574 specifications for high-strength alloy steel fasteners and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in industrial use.