S-91251A066 1-72 x 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
• Black-oxide coating on alloy steel enhances corrosion resistance and durability, extending service life in harsh industrial environments.
• Fine UNF threading offers improved load distribution and better sealing capabilities compared to coarse threads, ideal for precision equipment.
• Fully threaded design allows for maximum grip and adjustability along the entire length, simplifying installation in varied material thicknesses.
• Hex socket drive enables high-torque application with minimal risk of stripping, ensuring efficient and secure fastening in confined spaces.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency, environmental safety, and adherence to international quality standards.

Professional Applications & Engineering Value

This 1-72 UNF Class 3A socket head cap screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. Crafted from black-oxide alloy steel, it combines high Rockwell C37 hardness with excellent tensile strength, making it ideal for demanding applications in aerospace, automotive, and precision machinery. The fine thread and right-hand direction provide superior clamping force and resistance to dynamic loads, while the fully threaded rod ensures consistent performance across joint variations. Its hex drive design facilitates easy installation in tight spaces, reducing assembly time and improving operational efficiency in industrial fastening systems.

Specification Summary & Compliance

This socket head cap screw features precise Class 3A thread fit per UNF standards, with a thread size of 1-72 and a length of 1/4 inch. It meets ASTM A574 specifications for high-strength alloy steel, ensuring dimensional accuracy and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial and electronic applications without hazardous substances.