S-90128A363 1/4"-28 x 5/8" 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.
• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 3A fine threads provide a tighter, more secure fit with minimal backlash, enhancing assembly accuracy and vibration resistance.
• Fully threaded design allows for uniform load distribution and consistent clamping force across the entire length, improving joint stability.
• High hardness rating (Rockwell C37) offers excellent wear resistance, reducing deformation and maintaining thread integrity during repeated use.
• Standard hex drive (3/16") enables easy installation and removal with common tools, speeding up assembly and maintenance processes.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to rigorous quality and environmental standards, supporting sustainable and safe industrial operations.

Professional Applications & Engineering Value

This 1/4"-28 UNF socket head cap screw is engineered to address critical challenges in industrial settings, such as vibration loosening and material fatigue. The zinc-plated alloy steel provides robust protection against corrosion, making it ideal for machinery, automotive assemblies, and outdoor equipment where exposure to moisture and chemicals is common. The Class 3A fine thread configuration ensures a precise, secure fit in high-vibration environments, minimizing the need for frequent retightening and reducing downtime. With its fully threaded design and high tensile strength, it delivers consistent clamping force in critical joints, enhancing the longevity and reliability of engineered systems. These socket head screws are widely used in applications requiring compact, high-strength fasteners with easy access for installation and maintenance.

Specification Summary & Compliance

This product features a 1/4"-28 UNF thread with Class 3A tolerance for precise fit and performance. It adheres to ASTM A574 specifications, ensuring consistent quality in manufacturing. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety standards for industrial use. The screw is fully threaded and designed with a right-hand thread direction, supporting reliable fastening in various applications.