S-91251A884 7/8"-9 x 3" 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 in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and disassembly.
• 3/4" hex drive design allows for high-torque installation with standard tools, speeding up assembly and reducing labor time.
• Fully threaded body ensures consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industry standards.

Professional Applications & Engineering Value

Engineered for demanding environments, these black-oxide alloy steel socket head cap screws deliver robust performance where reliability is critical. The Class 3A UNRC coarse threads provide superior grip and resistance to loosening under dynamic loads, making them ideal for heavy machinery, automotive assemblies, and construction equipment. The high tensile strength and corrosion-resistant black-oxide coating address common issues like material fatigue and environmental degradation, ensuring long-term durability in applications exposed to moisture, chemicals, or high stress. By combining precise socket head design with fully threaded construction, these screws offer easy installation and consistent clamping, reducing downtime and enhancing operational efficiency in industrial settings.

Specification Summary & Compliance

This socket head cap screw features a 7/8"-9 UNRC coarse thread with Class 3A fit for precise tolerance, ensuring secure fastening. Manufactured in accordance with ASTM A574 specifications, it includes full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.