S-90044A276 1 1/8"-12 x 5" 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 corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 2A thread fit allows for smooth installation and secure fastening, improving assembly efficiency and joint integrity.
• High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
• 7/8" hex drive design offers superior torque transmission for secure tightening in confined spaces.
• Fine UNF thread pattern delivers enhanced vibration resistance and better load distribution compared to coarse threads.
• Compliance with multiple standards including ASTM A574, RoHS 3 and REACH ensures material quality and environmental responsibility.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw addresses critical engineering challenges in heavy machinery, automotive, and construction applications where vibration resistance and corrosion protection are paramount. The UNF fine thread configuration provides superior clamping force retention in dynamic load conditions, while the partially threaded design allows for precise positioning and stress concentration management. The socket head profile enables installation in confined spaces where wrench clearance is limited, making it ideal for equipment maintenance, structural assemblies, and precision manufacturing applications requiring high-strength fastening solutions that withstand extreme operational demands.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 2A thread tolerance for consistent fit and performance. The 1 1/8"-12 UNF fine thread follows standardized dimensions for compatibility with corresponding nuts and threaded components. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring restricted substance compliance. The black-oxide surface treatment provides corrosion protection while maintaining dimensional stability across the 5" length and partially threaded configuration.