S-91251A972 9/16"-12 x 3 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, 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 3A thread fit provides tighter tolerances for improved vibration resistance and secure fastening in critical assemblies.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Coarse UNC threading enables quicker installation and better performance in materials where fine threads might strip.
• Full threading along the entire 3-1/2" length allows for adjustable positioning and maximum grip in deep applications.
• Standard hex socket drive (7/16") ensures compatibility with common tools and provides high torque capability without cam-out.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws deliver critical performance where standard fasteners fail. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes them ideal for heavy machinery, automotive assemblies, and construction equipment subjected to dynamic loads and vibration. The UNC coarse thread profile ensures reliable engagement in both metallic and non-metallic materials, while the black-oxide surface treatment provides essential corrosion protection without compromising dimensional accuracy. These fully threaded fasteners maintain consistent Class 3A thread fit throughout their length, offering engineers flexible positioning options and superior clamping force in critical joints where precision and reliability are paramount.

Specification Summary & Compliance

This socket head cap screw features 9/16"-12 UNC coarse threading with precision Class 3A thread fit for exacting tolerance requirements. Manufacturing complies with ASTM A574 specification for high-strength alloy steel socket head cap screws. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental responsibility and regulatory adherence for global industrial applications.