S-90344A126 3/8"-16 x 1 1/4" ASTM A574 Socket Head Screws with Flat Washer

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 black-oxide finish on both the alloy steel screw and washer, extending service life in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Integrated flat washer distributes load evenly, preventing surface damage and maintaining joint integrity under repeated stress.
• High hardness rating (Rockwell C39) offers excellent wear resistance, ensuring durability in high-cycle applications.
• Coarse UNC threads enable faster installation and reduced cross-threading risk, improving assembly efficiency.
• Hex socket drive design allows for high-torque application with standard tools, facilitating secure tightening in confined spaces.

Professional Applications & Engineering Value

Engineered for industrial fastening where reliability is critical, this black-oxide alloy steel socket head cap screw addresses common challenges like vibration-induced loosening and corrosion. The coarse 3/8"-16 UNC thread ensures quick, secure engagement in materials where fine threads might strip, while the Class 3A fit maintains precision in high-vibration machinery, automotive assemblies, and heavy equipment. The integrated flat washer enhances load distribution, preventing surface indentation and protecting sensitive components. With a fully threaded design and right-hand thread direction, it provides consistent clamping force across the entire length, making it ideal for structural applications requiring uniform stress management.

Specification Summary & Compliance

This socket head cap screw meets ASTM A574 specifications for high-strength alloy steel fasteners, ensuring consistent material quality and performance. Threads conform to UNC coarse thread standards with a Class 3A fit for precision assembly. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and restricted substance adherence for global industrial use.