S-90128A239 1/4"-20 x 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure
• Precision Class 3A thread fit provides superior engagement and vibration resistance for secure, long-lasting assemblies
• Zinc-plated alloy steel construction offers excellent corrosion resistance, extending service life in demanding industrial environments
• Rockwell C37 hardness rating delivers outstanding durability and wear resistance, maintaining thread integrity through repeated use
• Standard hex socket drive design allows for easy installation with common tools while providing high torque capability
• Full threading along the entire length enables maximum adjustability and secure fastening at any point along the screw
• Compliance with RoHS 3 and REACH regulations ensures environmental responsibility and global market acceptance

Professional Applications & Engineering Value

These socket head cap screws are engineered to solve critical fastening challenges in demanding industrial applications where reliability is paramount. The combination of zinc-plated alloy steel and Class 3A thread fit addresses common issues of vibration loosening and corrosion in machinery, automotive, and heavy equipment assemblies. The 1/4"-20 UNC coarse threads provide rapid installation and superior holding power, while the hex drive socket design allows for high-torque applications in confined spaces. With 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners maintain integrity under extreme loads, making them ideal for critical structural connections where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features precision 1/4"-20 UNC coarse threads with Class 3A fit for superior thread engagement and dimensional accuracy. Manufactured to ASTM A574 specifications, the fastener delivers consistent performance and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The zinc-plated surface treatment provides additional corrosion protection while maintaining the high-strength characteristics of the underlying alloy steel material.