S-90128A303 3/8"-16 x 3 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 in high-stress applications, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides excellent corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies.
• Partially threaded design allows for optimal clamping force and easier alignment in varied material thicknesses.
• 5/16" hex drive enables high torque application with standard tools, minimizing stripping and improving installation efficiency.
• Rockwell C37 hardness ensures durability and resistance to wear, maintaining integrity under repetitive loads.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to industry standards and environmental safety, supporting sustainable procurement.

Professional Applications & Engineering Value

This 3/8"-16 UNC Socket Head Cap Screw is engineered for demanding industrial settings where reliability is critical. The zinc-plated alloy steel material combats corrosion in outdoor or chemically exposed environments, while the coarse thread and Class 3A fit provide quick assembly and superior resistance to loosening from vibrations. Ideal for heavy machinery, automotive systems, and construction equipment, these screws address common issues like joint failure and maintenance downtime. The partially threaded rod allows precise engagement in thick materials, ensuring consistent clamping force without compromising structural integrity. By meeting ASTM A574 specifications, these fasteners deliver consistent performance in high-torque applications, making them a trusted choice for engineers seeking durable, compliant solutions.

Specification Summary & Compliance

This product features precise Class 3A thread fit and UNC coarse threads with a minimum thread length of 1 1/4" for secure fastening. Manufactured in accordance with ASTM A574 standards, it ensures high tensile strength and dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, this screw supports environmental and safety requirements in industrial supply chains.