S-90044A247 3-56 x 5/16" 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.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery and equipment.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh industrial environments.
• Fine UNF threads deliver improved clamping force and better load distribution, ideal for applications requiring fine adjustments and secure fastening.
• 5/64" hex socket drive allows for easy installation and removal with standard tools, minimizing assembly time and improving workflow efficiency.
• Fully threaded design ensures consistent engagement along the entire length, providing uniform stress distribution and versatile mounting options.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting stringent industry and regulatory standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw with a 3-56 UNF fine thread and Class 3A fit is engineered to address common industrial challenges such as vibration loosening and material fatigue. The high tensile strength (170,000 psi) and Rockwell C37 hardness ensure durability in heavy-duty applications, from precision machinery to automotive assemblies. The fine thread design enhances grip and resistance to dynamic loads, while the black-oxide surface treatment provides reliable protection against rust and wear. Ideal for industrial screws in confined spaces, its socket head and 5/64" hex drive facilitate easy access and secure tightening, reducing maintenance downtime and improving operational reliability.

Specification Summary & Compliance

This product features precise Class 3A thread fit per UNF standards, with a right-hand thread direction and fully threaded rod type for consistent performance. It complies with ASTM A574 specifications for material quality, and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations in industrial use.