S-91251A430 3/8"-24 x 1 3/4" 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.
• Superior corrosion resistance from the black-oxide finish extends service life and maintains integrity in harsh environments.
• Precise Class 3A thread fit allows for tighter tolerances and secure fastening, minimizing loosening in critical assemblies.
• Fine UNF threads provide increased engagement and vibration resistance, ideal for machinery requiring stable connections.
• High hardness (Rockwell C37) enhances wear resistance and durability, supporting long-term use without degradation.
• Partially threaded design offers flexibility for applications needing unthreaded shank sections, improving alignment and shear strength.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting global regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in demanding settings. The UNF fine thread and Class 3A fit deliver precise engagement, reducing the need for frequent maintenance in machinery, automotive, and aerospace assemblies. Its high tensile strength and Rockwell C37 hardness provide reliable performance under heavy loads, while the black-oxide surface treatment offers added protection against rust, making it suitable for outdoor or humid environments. By integrating these features, it enhances assembly efficiency and longevity in precision applications, from equipment manufacturing to structural frameworks.

Specification Summary & Compliance

This socket head cap screw adheres to Class 3A thread fit for tight dimensional accuracy and uses UNF fine threads (3/8"-24) per standard inch measurements. It conforms to ASTM A574 specifications for high-strength alloy steel and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability in industrial use.