S-91251A072 2-56 x 1/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable, long-lasting fastening in demanding industrial environments.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, non-reflective finish.
• Class 3A thread fit delivers precise, tight tolerances for secure assemblies with minimal risk of loosening.
• Hex socket drive (5/64") allows for easy installation and high torque application in confined spaces.
• Fully threaded design offers consistent grip and uniform load distribution along the entire length.
• Rockwell C37 hardness ensures high wear resistance and maintains integrity under repeated stress.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global applications.

Professional Applications & Engineering Value

Engineered for precision and durability, these 2-56 UNC socket head cap screws are ideal for high-stress industrial applications such as machinery assembly, electronics enclosures, and automotive components. The black-oxide alloy steel construction combats corrosion while the coarse thread spacing and Class 3A thread fit provide quick, secure fastening with reduced cross-threading risks. With a fully threaded right-hand design and hex drive, these screws ensure efficient installation in tight spaces, delivering consistent performance and minimizing downtime in critical engineering projects.

Specification Summary & Compliance

This socket head cap screw adheres to Class 3A thread fit for precise dimensional accuracy under the UNC thread standard. Manufactured in accordance with ASTM A574 specifications, it ensures high strength and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable use across various industries.