S-90044A526 1/4"-20 x 3 1/4" 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 critical applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in harsh environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, enhancing joint integrity in machinery and equipment.
• Hex socket drive design allows for high-torque installation with standard tools, enabling efficient assembly and disassembly in confined spaces.
• Fully threaded rod type offers consistent gripping along the entire length, accommodating various material thicknesses and improving load distribution.
• Rockwell C37 hardness delivers excellent wear resistance, maintaining dimensional stability and thread integrity over repeated use.
• Compliance with ASME B18.3 and environmental standards ensures quality, safety, and regulatory adherence for global industrial supply chains.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges, such as vibration loosening and environmental degradation. The UNRC coarse thread and Class 3A fit provide superior holding power in dynamic applications, from heavy machinery to automotive assemblies, where precision and reliability are paramount. The corrosion-resistant black-oxide coating protects against moisture and chemicals, reducing downtime in demanding settings like manufacturing plants or outdoor equipment. Its high tensile strength and fully threaded design make it ideal for securing components in high-load scenarios, ensuring long-term performance without compromising on safety or efficiency.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including Class 3A thread fit for accurate engagement and ASME B18.3 specifications for consistent quality. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for environmentally conscious industrial applications. The coarse thread spacing and right-hand thread direction align with common assembly practices, facilitating ease of use across various sectors.