S-90128A455 7/16"-20 x 1 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.
• Corrosion-resistant zinc-plated alloy steel construction extends service life and maintains integrity in harsh industrial environments.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in critical assemblies.
• Fine UNF thread design offers improved load distribution and enhanced clamping force compared to coarse threads.
• Fully threaded body allows for maximum adjustability and consistent holding power along the entire length.
• Hex socket drive (3/8") enables high-torque installation with standard tools, facilitating efficient assembly and maintenance.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.

Professional Applications & Engineering Value

This zinc-plated alloy steel socket head cap screw is engineered to address common challenges in precision machinery, automotive, and heavy equipment industries. The 7/16"-20 UNF fine thread configuration delivers superior resistance to vibrational loosening and fatigue, critical in dynamic load conditions. With a Rockwell C37 hardness and 170,000 psi tensile strength, it withstands extreme mechanical stresses without deformation, ensuring long-term joint integrity. The hex drive design allows for flush mounting in confined spaces, while the corrosion-resistant plating protects against degradation in humid or chemically aggressive environments. Ideal for applications demanding Class 3A thread fit accuracy, this fastener provides reliable performance in assembly lines, structural frameworks, and precision instrument manufacturing.

Specification Summary & Compliance

This socket head cap screw features a 7/16"-20 UNF fine thread with Class 3A fit for precise dimensional accuracy. Manufactured to ASTM A574 specifications, it ensures consistent mechanical properties and thread quality. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. The fully threaded design and right-hand thread direction adhere to industry standards, providing reliable interoperability in professional fastener systems.