S-90128A560 1/4"-20 x 3 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tight tolerances for secure, vibration-resistant assemblies in demanding environments.
• Zinc-plated alloy steel construction offers excellent corrosion resistance, extending service life and reducing maintenance needs.
• Partially threaded design allows for controlled clamping force and easier alignment in various industrial setups.
• Rockwell C37 hardness enhances durability and wear resistance, ideal for repetitive or heavy-duty use.
• 3/16" hex drive enables efficient installation with standard tools, saving time and labor costs.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

These 1/4"-20 UNC socket head cap screws are engineered to address common industrial challenges, such as vibration loosening and material fatigue. The zinc-plated alloy steel provides robust protection against corrosion, while the coarse thread and Class 3A fit deliver secure fastening in machinery, automotive, and construction applications. With a partially threaded rod and high tensile strength, they offer precise clamping control and resilience under heavy loads, minimizing downtime and enhancing assembly integrity in industrial socket screw systems.

Specification Summary & Compliance

This product features a 1/4"-20 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy. It meets ASTM A574 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry-standard reliability.