S-91251A191 8-32 x 5/16" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications
• Precision Class 3A thread fit guarantees consistent, secure fastening with minimal play
• Fully threaded UNC coarse design provides maximum grip and faster installation in various materials
• Rockwell C37 hardness maintains structural integrity and resists wear over repeated use
• Hex socket drive compatibility allows for high-torque application with standard 9/64" tools
• Comprehensive compliance with ASTM A574, RoHS 3, and REACH ensures material safety and reliability

Professional Applications & Engineering Value

Engineered for precision machinery, automotive assemblies, and heavy-duty equipment, this 8-32 UNC Socket Head Cap Screw delivers exceptional clamping force and vibration resistance. The black-oxide alloy steel construction provides a protective barrier against oxidation and mild chemicals, reducing maintenance needs in harsh conditions. Its coarse thread and Class 3A fit prevent cross-threading and ensure accurate alignment in high-volume production lines. The fully threaded design offers uniform stress distribution, making it ideal for applications requiring consistent load-bearing capacity and reliable disassembly/reassembly cycles.

Specification Summary & Compliance

This socket head cap screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for superior dimensional accuracy. Manufactured in compliance with ASTM A574 specifications, it meets rigorous performance criteria for alloy steel fasteners. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global industrial use.