S-90044A211 1 1/4"-7 x 3 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life and reducing maintenance needs in harsh industrial environments.
• High hardness rating of Rockwell C37 offers excellent wear resistance, maintaining thread integrity and drive features through repeated use and high-torque installation.
• Precise Class 2A thread fit with coarse UNC threading enables faster assembly, reduces cross-threading risks, and provides reliable engagement in various materials.
• Optimized drive efficiency with the 7/8" hex socket design allows for high torque application and secure fastening in confined spaces where wrench clearance is limited.
• Versatile partial threading design provides both threaded engagement and smooth shank sections, ideal for applications requiring clamping force and precise positioning.
• Full regulatory compliance with ASTM A574, RoHS 3, and REACH standards ensures material quality, environmental safety, and global acceptance for industrial procurement.

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws deliver critical performance advantages for heavy machinery, automotive assemblies, and structural frameworks where high tensile strength and corrosion resistance are paramount. The 1 1/4"-7 UNC coarse thread configuration ensures rapid installation and reliable holding power in steel frames, equipment bases, and construction applications, while the 7/8" hex drive accommodates high-torque tools without stripping. The partially threaded design with 3 1/8" minimum thread length provides optimal stress distribution, preventing joint loosening under vibration and dynamic loads. Engineered to ASTM A574 specifications, these screws solve common industrial challenges of fastener fatigue, environmental degradation, and assembly efficiency in demanding operational conditions.

Specification Summary & Compliance

This socket head cap screw maintains Class 2A thread fit per UNC standards with 1 1/4"-7 coarse threading and right-hand direction. Manufacturing complies with ASTM A574 for alloy steel socket head cap screws, ensuring consistent dimensional accuracy and mechanical properties. The product is verified as RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting international environmental and substance restriction requirements for industrial components.