S-90044A423 1/4"-20 x 11/16" ASME B18.3, 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 wear resistance from Rockwell C37 hardness extends service life and maintains integrity in high-friction or repetitive assembly environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
• Corrosion-resistant black-oxide finish on alloy steel enhances durability in various industrial settings, offering protection against rust and environmental factors.
• Standard hex drive design with 3/16" drive size allows for easy installation and removal using common tools, improving assembly efficiency.
• Coarse UNRC thread enables quick engagement and strong holding power, ideal for applications requiring rapid assembly and disassembly.
• Full threading along the 11/16" length ensures consistent grip and load distribution, accommodating a wide range of material thicknesses.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in industrial and mechanical assemblies, where high tensile strength and durability are paramount. The Class 3A thread fit and coarse UNRC thread design provide superior resistance to vibration and shock, making it ideal for heavy machinery, automotive components, and precision equipment. The black-oxide surface treatment not only enhances corrosion resistance but also reduces galling during installation, extending the fastener's lifespan in harsh environments. By combining 170,000 psi tensile strength with Rockwell C37 hardness, this screw minimizes wear and maintenance needs, ensuring reliable performance in applications such as tooling, aerospace, and construction. Its fully threaded and right-hand thread configuration allows for versatile use across various clamping and fastening scenarios, delivering consistent engineering value.

Specification Summary & Compliance

This socket head cap screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNRC coarse thread specifications. It meets ASME B18.3 and ASTM A574 manufacturing guidelines, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental suitability for global industrial use.