S-91251A386 7/8"-9 x 7 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 extreme loads, reducing the risk of fastener failure in critical applications.
• Superior thread fit with Class 3A tolerance provides precise engagement and vibration resistance, minimizing loosening in high-stress environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial conditions.
• Partially threaded design with UNC coarse threads allows for easier alignment and faster installation, saving valuable assembly time.
• High hardness (Rockwell C37) maintains structural integrity and wear resistance, ensuring durability through repeated use.
• 3/4" hex drive socket head enables high-torque installation with standard tools, facilitating secure fastening in confined spaces.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting rigorous industry standards.

Professional Applications & Engineering Value

This 7/8"-9 UNC socket head cap screw is engineered for demanding industrial applications where reliability and strength are paramount. The black-oxide alloy steel construction provides excellent resistance to corrosion and wear, making it ideal for machinery, heavy equipment, and structural assemblies exposed to harsh environments. The partially threaded design with coarse UNC threads ensures quick and secure fastening, reducing installation time while maintaining high clamp load. Its Class 3A thread fit minimizes backlash and enhances vibration resistance, critical in dynamic load conditions. With a 170,000 PSI tensile strength and Rockwell C37 hardness, it addresses common failure points in high-stress applications, offering engineers a dependable solution for bolted joints requiring precision and durability.

Specification Summary & Compliance

This socket head cap screw features a 7/8"-9 UNC coarse thread with Class 3A fit for precise thread engagement and tolerance. It is manufactured in accordance with ASTM A574 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.