S-90044A141 5/16"-18 x 2 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Exceptional hardness at Rockwell C37 provides excellent wear resistance and durability for extended service life in demanding environments.
• Precision Class 3A thread fit guarantees secure, vibration-resistant assemblies with minimal risk of loosening over time.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, making these screws suitable for various industrial conditions without sacrificing mechanical properties.
• Standard hex drive design with 1/4" drive size allows for easy installation and removal using common tools, improving assembly efficiency.
• Full threading and coarse UNC thread enables quick engagement and strong holding power in a wide range of materials.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, providing peace of mind for global sourcing.

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws are engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion degradation. The Class 3A thread fit and coarse UNC threads deliver precise, reliable fastening in machinery, automotive assemblies, and heavy equipment, where high tensile strength and durability are paramount. The black-oxide surface treatment not only resists rust but also maintains the screw's integrity under harsh conditions, reducing maintenance needs. Ideal for applications requiring fully threaded fasteners with consistent performance, these screws support efficient production and long-term operational stability, backed by compliance with ASTM A574 and environmental standards.

Specification Summary & Compliance

This socket head cap screw features a 5/16"-18 UNC coarse thread with Class 3A fit for precise tolerances, ensuring reliable engagement. It is manufactured from alloy steel with a black-oxide finish, meeting ASTM A574 specifications for high-strength fasteners. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming adherence to environmental and safety regulations for industrial use.