S-90344A132 4-40 x 3/4" ASTM A574 Socket Head Screws with Flat Washer

Key Features & Benefits at a Glance

• Exceptional strength and durability with 170,000 psi tensile strength and Rockwell C39 hardness for reliable performance in demanding applications
• Superior corrosion resistance provided by the black-oxide finish on both the alloy steel screw and integrated flat washer
• Precise thread engagement with Class 3A thread fit ensuring tight tolerances and secure fastening in critical assemblies
• Enhanced load distribution through the integrated flat washer that helps prevent surface damage and maintains joint integrity
• Optimal drive efficiency with hex socket head design allowing high torque application and access in confined spaces
• Reliable coarse threading using UNC 4-40 threads for faster assembly and reduced cross-threading risks
• Full thread coverage along the entire 3/4" length providing maximum grip and adjustment flexibility

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw delivers exceptional engineering value in demanding industrial environments where corrosion resistance and high tensile strength are critical. The combination of 170,000 psi tensile strength and Rockwell C39 hardness ensures reliable performance in heavy machinery, automotive assemblies, and precision equipment that experience significant vibrational loads and stress. The integrated flat washer enhances load distribution while the black-oxide surface treatment provides superior protection against environmental factors. The UNC coarse thread pattern with Class 3A fit guarantees precise engagement and reduces installation time, making these socket head cap screws ideal for maintenance-critical applications requiring repeated disassembly and reassembly without performance degradation.

Specification Summary & Compliance

This precision fastener features 4-40 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASTM A574 specifications for high-strength socket head cap screws, it ensures consistent performance and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications with strict material restrictions. The inch system measurements guarantee compatibility with standard industrial equipment and replacement protocols.