S-91251A186 8-32 x 3 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.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish suitable for harsh industrial environments.
• Rockwell C37 hardness delivers excellent wear resistance and long-term durability, minimizing wear and tear during repeated use.
• Coarse UNC threads enable faster installation and easier alignment, improving assembly efficiency in production lines.
• Partially threaded design allows for precise clamping force control, ideal for applications requiring specific grip lengths without thread interference.
• Hex socket drive ensures secure tool engagement and high torque transmission, reducing the likelihood of stripping during installation.

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 heavy-duty applications. The black-oxide alloy steel construction provides robust protection against environmental factors, while the Class 3A thread fit ensures precise, reliable fastening in machinery, automotive assemblies, and precision equipment. With a coarse thread spacing and right-hand thread direction, they facilitate quick installation and maintain integrity under dynamic loads, making them ideal for industrial fasteners in manufacturing, aerospace, and construction sectors where high tensile strength and compliance with strict standards are critical.

Specification Summary & Compliance

This product features a 3-1/2" length with a minimum thread length of 7/8", UNC coarse threads, and Class 3A thread fit for high precision. It complies with ASTM A574 specifications for socket head cap screws, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, supporting environmentally responsible and safe use in various industrial applications.