S-91251A071 1-72 x 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.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, maintaining secure connections in demanding applications.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
• Fine UNF thread spacing allows for finer adjustment and improved clamping force control in precision assemblies.
• Hex socket drive design enables high torque application and easy installation in confined spaces with standard tools.
• Full threading along the 3/4" length ensures consistent holding power and flexibility in various material thicknesses.
• Rockwell C37 hardness provides excellent wear resistance and durability, minimizing deformation during repeated use.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial and precision engineering environments. The combination of high tensile strength (170,000 psi) and Class 3A UNF fine threads ensures secure fastening in applications where vibration resistance and precise clamping are paramount, such as machinery, automotive assemblies, and electronic enclosures. The black-oxide surface treatment not only enhances corrosion protection but also reduces galling, making it ideal for repetitive disassembly and reassembly operations. Its fully threaded right-hand design and hex drive compatibility allow for efficient installation in tight spaces, reducing assembly time and improving overall operational efficiency in industrial fastener systems.

Specification Summary & Compliance

This socket head cap screw features a 1-72 UNF thread with Class 3A fit, ensuring precise dimensional accuracy and reliable performance. Manufactured in accordance with ASTM A574 specifications, it guarantees consistent quality and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industries without hazardous substance restrictions.