S-91864A045 3/8"-24 x 5/8" 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.
• Superior thread precision with Class 3A fit and UNF fine threads provides secure, vibration-resistant connections in critical assemblies.
• Durable black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in demanding environments.
• Standard hex socket drive (5/16") allows for easy installation and removal with common tools, improving assembly efficiency.
• Full threading along the 5/8" length enables consistent clamping force and versatile use across various material thicknesses.
• High hardness rating (Rockwell C37) maintains thread integrity and resists wear during repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial applications.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and corrosion in machinery, automotive, and aerospace assemblies. The 3/8"-24 UNF fine threads with Class 3A fit deliver precise engagement, minimizing play and enhancing joint reliability under dynamic loads. The fully threaded design and high tensile strength provide uniform stress distribution, making it ideal for securing components in tight spaces or high-pressure environments. Its black-oxide surface treatment adds a protective layer against moisture and chemicals, reducing maintenance needs and downtime. By meeting ASTM A574 specifications, this screw ensures consistent performance in critical applications where fastener integrity is paramount.

Specification Summary & Compliance

This socket head cap screw adheres to inch system measurements with a Class 3A thread fit and UNF fine thread standard for precise dimensional accuracy. It conforms to ASTM A574 manufacturing specifications, guaranteeing material and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated industries worldwide.