S-91274A184 1/4"-20 x 1 3/4" ASME B18.3, ASTM A574, ASTM B117 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 corrosion resistance provided by the zinc-flake coating, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, minimizing loosening and improving assembly reliability.
• High hardness (Rockwell C37) enhances wear resistance and durability, ensuring long-term performance with reduced maintenance needs.
• Hex socket drive design allows for easy installation and high torque application in confined spaces, increasing efficiency during assembly.
• Compliance with ASME B18.3 and ASTM A574 standards ensures consistent quality, dimensional accuracy, and interoperability with other standardized components.
• RoHS 3 and REACH compliance meets environmental and safety regulations, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

This 1/4"-20 UNC Socket Head Cap Screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion in heavy machinery. The zinc-flake-coated alloy steel construction provides robust protection against rust and chemical exposure, ideal for automotive, aerospace, and manufacturing equipment. Its coarse UNC threads and Class 3A fit ensure quick, secure fastening in high-vibration environments, reducing downtime. The partially threaded design allows for precise clamping force distribution, preventing joint failure. With a hex drive for easy access in tight spaces, it streamlines maintenance and assembly processes, enhancing operational efficiency and safety in industrial applications.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit for precise dimensional accuracy under the UNC coarse thread standard. It meets ASME B18.3 and ASTM A574 manufacturing specifications, ensuring consistent performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmental safety and regulatory requirements for industrial use.