S-90128A593 5/16"-18 x 2 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 demanding applications, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides superior corrosion resistance, extending service life in harsh industrial environments.
• Class 3A thread fit offers tighter tolerances for precise assembly and improved vibration resistance in critical applications.
• 1/4" hex drive socket head allows for easy installation and removal with standard tools, minimizing assembly time.
• Partially threaded design enables secure clamping where unthreaded shank sections are needed for alignment and shear strength.
• Coarse UNC threads facilitate quick engagement and reduce cross-threading risks, ideal for repetitive assembly tasks.
• Rockwell C37 hardness ensures durability and wear resistance, maintaining integrity under high-stress conditions.

Professional Applications & Engineering Value

This 5/16"-18 UNC socket head cap screw is engineered with zinc-plated alloy steel to address common industrial challenges such as corrosion, mechanical stress, and assembly efficiency. The coarse thread design allows for rapid installation in equipment manufacturing, automotive assemblies, and machinery frames, reducing labor time while providing secure fastening. With a tensile strength of 170,000 psi and Rockwell C37 hardness, it withstands heavy loads and vibrations, preventing loosening in dynamic environments. The partially threaded rod offers enhanced shear resistance, making it suitable for precision applications where unthreaded sections improve joint stability. Compliant with ASTM A574, these screws deliver consistent performance in high-stress scenarios, from construction to aerospace, ensuring long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This product features precise Class 3A thread fit and UNC coarse threads with a minimum thread length of 1-3/8" and overall length of 2-1/2". Manufactured to meet ASTM A574 specifications, it ensures dimensional accuracy and mechanical properties. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and material restrictions adherence, supporting sustainable industrial practices.