S-91251A449 0-80 x 9/16" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, minimizing the risk of fastener failure.
• Precise Class 3A thread fit guarantees tight, secure connections with excellent vibration resistance in fine-threaded applications.
• Black-oxide finish on alloy steel provides enhanced corrosion resistance, extending service life in demanding industrial environments.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated assembly and disassembly.
• Fully threaded design allows for maximum grip and adjustability across the entire length, ideal for precision clamping applications.
• Hex socket drive enables high-torque installation with standard tools, reducing the risk of stripping and improving assembly efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and global regulatory acceptance.

Professional Applications & Engineering Value

These 0-80 UNF socket head cap screws are engineered for high-precision assemblies where space constraints and reliability are critical. The fine thread (UNF) and Class 3A fit provide superior clamping force and vibration resistance in compact machinery, electronics, and aerospace components. Made from black-oxide alloy steel, they resist corrosion and wear, ensuring long-term performance in harsh conditions. The fully threaded design allows for consistent load distribution, preventing loosening in dynamic applications. With a hex drive for secure installation, these screws are ideal for automated assembly lines, reducing downtime and maintenance costs.

Specification Summary & Compliance

This screw meets ASTM A574 specifications for high-strength alloy steel socket head cap screws. Threads conform to UNF fine thread standards with a Class 3A tolerance for precise fit. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring no restricted substances are used. Dimensions include a 9/16" length, 0.050" hex drive, and 0-80 thread size, manufactured to exact inch system measurements for consistent performance.