S-91251A428 3/8"-24 x 1 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-oxide coating, ideal for harsh industrial environments.
• Superior tensile strength of 170,000 psi ensures reliable performance under high-stress applications.
• Precise Class 3A thread fit for secure, vibration-resistant assemblies in critical machinery.
• High hardness (Rockwell C37) provides excellent wear resistance and long-term durability.
• Fully threaded design allows for consistent clamping force along the entire 1-1/2" length.
• Fine UNF thread spacing delivers improved load distribution and finer adjustment capabilities.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety.

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 demanding settings. The 3/8"-24 UNF fine thread and Class 3A fit ensure tight, precise fastening in high-precision equipment, reducing maintenance needs. Its fully threaded right-hand design and hex drive socket head facilitate easy installation in confined spaces, making it ideal for automotive, aerospace, and heavy machinery applications where reliability and corrosion resistance are critical. The combination of high tensile strength and hardness supports extended service life under cyclic loads.

Specification Summary & Compliance

This screw features a 3/8"-24 UNF thread with Class 3A fit for tight tolerances, manufactured in accordance with ASTM A574 standards. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety requirements. Dimensions include a 1-1/2" length, 5/16" hex drive, and standard socket head profile for consistent performance.