S-91251A047 3/4"-16 x 2 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 in demanding applications.
• Durable black-oxide finish on alloy steel provides enhanced corrosion resistance and a professional appearance, extending service life in various industrial environments.
• Class 3A thread fit with UNRF fine threads offers superior vibration resistance and precise engagement, minimizing loosening in critical assemblies.
• Hex socket drive (5/8" size) allows for high-torque installation with standard tools, facilitating efficient assembly and maintenance operations.
• Full threading along the 2 3/4" length enables flexible positioning and secure fastening across a wide range of material thicknesses.
• Rockwell C37 hardness provides excellent wear resistance and durability, maintaining thread integrity through repeated use.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting rigorous industry and regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in harsh environments. The UNRF fine thread design enhances grip and load distribution, making it ideal for precision machinery, automotive systems, and heavy equipment where high tensile strength and reliability are critical. The hex drive ensures easy installation in confined spaces, while the black-oxide surface treatment protects against rust without compromising dimensional accuracy. By combining robust alloy steel construction with strict adherence to ASTM A574, this fastener delivers consistent performance in applications demanding durability and compliance with international regulations.

Specification Summary & Compliance

This socket head cap screw features a 3/4"-16 UNRF fine thread with Class 3A fit for precise tolerance, ensuring secure fastening in high-precision assemblies. It is manufactured in accordance with ASTM A574 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for global industrial use without hazardous substances.