S-90128A104 4-48 x 1/4" 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.
• Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit with UNF fine threading delivers precise, vibration-resistant connections for critical assemblies requiring minimal play.
• Fully threaded design allows for uniform load distribution and consistent clamping force across the entire length.
• Hex socket drive style enables easy installation with standard tools, minimizing stripping and improving torque application accuracy.
• Rockwell C37 hardness rating offers excellent wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH standards guarantees material quality and environmental safety for global supply chain integration.

Professional Applications & Engineering Value

This 4-48 UNF socket head cap screw is engineered to address common industrial challenges such as vibration loosening and corrosion-induced degradation. The zinc-plated alloy steel material, combined with a Class 3A thread fit, ensures tight tolerances and durability in precision machinery, automotive systems, and electronic enclosures. Its fine thread spacing and fully threaded rod design provide enhanced grip and uniform stress distribution, reducing the need for frequent retightening in high-vibration environments. Ideal for applications requiring high tensile strength and reliable fastening, these screws offer long-term performance in assembly lines, robotics, and heavy equipment where industrial fasteners must withstand cyclic loading and exposure to contaminants.

Specification Summary & Compliance

This product adheres to Class 3A thread fit per UNF standards, ensuring precise dimensional accuracy and interchangeability. Manufactured in compliance with ASTM A574 specifications, it meets rigorous mechanical property requirements. The screw is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, confirming its suitability for use in regulated industries without hazardous substance restrictions.