S-91251A203 8-32 x 1 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 in demanding applications.
• Corrosion-resistant black-oxide finish on alloy steel enhances durability and provides protection against rust in various industrial environments.
• Class 3A thread fit offers tighter tolerances for superior thread engagement and vibration resistance, minimizing loosening over time.
• Partially threaded design with 7/8" minimum thread length allows for precise clamping force control and secure fastening in assemblies requiring specific grip ranges.
• High hardness (Rockwell C37) maintains structural integrity and wear resistance, extending the screw's service life in repetitive or high-load scenarios.
• Hex socket drive (9/64") enables easy installation with standard tools, providing a secure grip and reducing the chance of stripping during torque application.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards for material quality and environmental safety, supporting responsible sourcing and usage.

Professional Applications & Engineering Value

These 8-32 UNC thread socket head cap screws are engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in harsh environments. The black-oxide alloy steel construction combines high tensile strength (170,000 psi) with enhanced surface protection, making them ideal for machinery, automotive, and aerospace assemblies where reliability is critical. The coarse UNC thread and Class 3A fit provide excellent grip in materials like metals and plastics, reducing the need for frequent maintenance. Their partially threaded design allows for optimized load distribution, preventing joint failure in dynamic applications. By meeting ASTM A574 specifications, these screws deliver consistent performance, ensuring long-term stability in high-stress engineering projects.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNC standards, with a minimum thread length of 7/8" and coarse threading for efficient installation. It complies with ASTM A574 for material and manufacturing consistency, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence in industrial use.