S-91251A359 10-32 x 2 3/4" 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 secure, vibration-resistant assemblies in critical applications.
• Partially threaded design allows for optimal grip and alignment, facilitating easier installation and improved joint integrity.
• High hardness (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use and disassembly.
• 5/32" hex drive compatibility offers efficient torque transmission with standard tools, speeding up assembly processes.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety, meeting global regulatory standards.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these 10-32 UNRF socket head cap screws address common challenges like vibration loosening and environmental degradation. The black-oxide alloy steel construction provides a durable barrier against moisture and chemicals, ideal for machinery, automotive, and aerospace assemblies where corrosion resistance is critical. The fine UNRF threads and Class 3A fit deliver superior clamping force and stability, reducing the need for frequent retightening in high-vibration applications. With a partially threaded shank, they enable precise positioning and stress distribution, making them a reliable choice for high-strength fastening in precision equipment and structural components.

Specification Summary & Compliance

This screw adheres to Class 3A thread tolerances for precision fit and is manufactured per ASTM A574 specifications, ensuring consistent quality and performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming the absence of hazardous substances for environmental safety. The UNRF fine thread and right-hand direction follow standardized industrial practices, providing reliable interchangeability and ease of integration into existing systems.