S-91864A017 5-40 x 5/16" ASTM A574 Alloy Steel Socket Head Screws

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.
• Superior hardness rating of Rockwell C37 provides excellent wear resistance and durability for long-term use in demanding environments.
• Precise Class 3A thread fit guarantees tight tolerances and secure fastening, minimizing loosening and vibration issues.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending the screw's lifespan in various industrial settings.
• Fully threaded right-hand coarse UNC design allows for quick installation and strong holding power in coarse-thread applications.
• Hex socket drive (3/32") enables easy access and high torque application in confined spaces, improving assembly efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to strict quality and environmental standards, supporting sustainable procurement.

Professional Applications & Engineering Value

This 5-40 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial assembly, such as vibration resistance and space constraints. The black-oxide alloy steel construction provides a robust barrier against rust and wear, making it ideal for machinery, automotive, and equipment manufacturing where exposure to harsh conditions is common. Its fully threaded right-hand coarse thread design ensures rapid installation and reliable clamping force, reducing assembly time while maintaining integrity. The hex drive allows for secure tool engagement in tight areas, preventing slippage and damage. By meeting ASTM A574 specifications, it delivers consistent performance in high-stress applications, enhancing overall engineering reliability and reducing maintenance needs.

Specification Summary & Compliance

This screw features a 5-40 UNC coarse thread with a Class 3A fit for precise dimensional accuracy, ensuring secure fastening in inch-system applications. It is manufactured in compliance with ASTM A574 for high-strength alloy steel socket head cap screws, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substances.