S-90044A183 1/4"-28 x 4 1/2" 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.
• Superior thread precision with Class 3A fit provides tighter tolerances and better engagement, minimizing backlash and improving assembly accuracy.
• Durable black-oxide coating on alloy steel offers enhanced corrosion resistance and a professional finish, extending service life in harsh environments.
• Partially threaded design allows for precise clamping force control and secure fastening in specific joint configurations.
• Fine thread spacing (UNF) delivers improved vibration resistance and finer adjustment capabilities compared to coarse threads.
• Hex socket drive enables high-torque installation with reduced risk of cam-out, ensuring efficient assembly and disassembly.
• Compliance with ASTM A574 guarantees consistent quality and mechanical properties, meeting rigorous industrial standards.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in precision machinery, automotive assemblies, and heavy-duty equipment. The Class 3A thread fit and UNF fine threading provide superior resistance to loosening under vibration, a common issue in dynamic industrial environments. The partially threaded rod type allows engineers to design joints with unthreaded shank sections for enhanced shear strength and accurate positioning. With a Rockwell C37 hardness and robust 170,000 psi tensile strength, it withstands extreme loads without deformation, making it ideal for high-stress applications like aerospace components, manufacturing jigs, and hydraulic systems. The hex drive style ensures easy installation in confined spaces, improving maintenance efficiency.

Specification Summary & Compliance

This screw features a 1/4"-28 UNF thread size with Class 3A thread fit for precise dimensional accuracy and fine thread spacing. It is manufactured in accordance with ASTM A574 specifications, ensuring consistent mechanical properties and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and use in global markets.