S-91251A336 3/8"-24 x 1 1/8" 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 industrial applications, reducing the risk of fastener failure.
• Class 3A thread fit with UNF fine threads provides superior precision and vibration resistance, maintaining secure connections in dynamic environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh conditions.
• Rockwell C37 hardness rating delivers excellent wear resistance, minimizing deformation under heavy loads and repeated use.
• Fully threaded design with 5/16" hex drive allows for easy installation and uniform clamping force, speeding up assembly processes.
• Compliance with ASTM A574, RoHS 3, and REACH standards guarantees material quality and environmental safety, meeting rigorous industry regulations.
• Right-hand thread direction and standard socket head profile ensure compatibility with common tools and straightforward integration into existing systems.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in demanding sectors like machinery, automotive, and heavy equipment. The 3/8"-24 UNF fine threads with Class 3A fit provide tight tolerances that resist loosening from vibrations, a common issue in high-motion environments. Made from high-strength alloy steel and treated with a protective black-oxide finish, it combats corrosion and wear, ensuring long-term reliability in exposed or abrasive settings. The fully threaded rod and hex drive design facilitate quick, secure fastening, reducing assembly time and improving operational efficiency. Ideal for precision assemblies requiring consistent torque and durability, this screw supports robust performance in applications where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features precise Class 3A thread fit per UNF standards, with a thread size of 3/8"-24 and fine thread spacing for accurate engagement. It adheres to ASTM A574 specifications for high-strength materials, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it meets environmental and safety standards for industrial use.