S-90044A313 5/16"-18 x 9" 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 tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, low-reflectivity finish for extended service life.
• Rockwell C37 hardness delivers excellent wear resistance and durability, maintaining integrity under repeated use.
• Partially threaded design with 1-1/8" minimum thread length allows for precise clamping force control and easier alignment in assembled components.
• 5/16"-18 UNC coarse threads enable quick installation and reduced cross-threading risks, improving efficiency in assembly lines.
• 1/4" hex drive socket head facilitates easy access and high-torque application with standard tools, streamlining maintenance and repairs.

Professional Applications & Engineering Value

These socket head cap screws are engineered to address critical challenges in heavy-duty industrial settings, where high tensile strength and vibration resistance are paramount. The black-oxide alloy steel construction, combined with a Rockwell C37 hardness, ensures longevity in machinery, automotive, and construction applications, minimizing downtime due to fastener wear or corrosion. The Class 3A thread fit and 5/16"-18 UNC coarse threads provide secure fastening in dynamic environments, reducing loosening from shocks or thermal cycles. Ideal for use in partially threaded configurations, these screws offer precise load distribution, making them a reliable choice for engineers seeking compliance with ASTM A574 standards while enhancing assembly efficiency and safety.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC coarse threads with a thread size of 5/16"-18. It meets ASTM A574 specifications for high-strength fasteners and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.