S-90128A103 4-40 x 2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc plating, extending service life in demanding industrial environments
• Exceptional tensile strength of 170,000 PSI ensures reliable performance under high-stress conditions
• Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies
• Rockwell C37 hardness rating maintains structural integrity and prevents stripping during installation
• Hex socket drive design allows for high-torque installation in confined spaces with standard tools
• Coarse UNC threading enables faster assembly and reduced cross-threading risks
• Comprehensive compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety

Professional Applications & Engineering Value

Engineered for high-performance industrial applications, these 4-40 UNC socket head cap screws deliver exceptional reliability in machinery, automotive, and precision equipment assemblies. The zinc-plated alloy steel construction provides superior corrosion protection while maintaining the 170,000 PSI tensile strength required for critical connections. The Class 3A thread fit ensures precise engagement that resists loosening under vibration, making these hex drive fasteners ideal for applications where maintenance access is limited. With coarse thread spacing and partial threading, installation efficiency is maximized while providing optimal clamping force distribution across the 2" length.

Specification Summary & Compliance

This socket head cap screw features precision 4-40 UNC coarse threads with Class 3A fit and 3/4" minimum thread length. Manufactured to ASTM A574 specifications with Rockwell C37 hardness and 170,000 PSI tensile strength. The inch system measurement includes 0.183" head diameter and 3/32" hex drive. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial use.