S-90401A192 8-32 x 3/8" Hex Head Screws with Lock Washer

Key Features & Benefits at a Glance

• Enhanced vibration resistance with the integrated external-tooth lock washer that maintains clamping force in high-stress environments
• Superior corrosion protection through zinc-plated steel construction, extending service life in industrial settings
• High tensile strength of 60,000 psi ensures reliable performance under heavy loads and prevents fastener failure
• Precise Class 2A thread fit guarantees smooth installation and consistent engagement in UNC coarse threaded applications
• Rockwell B70 hardness rating provides excellent wear resistance and durability for repeated use
• Full threading design allows for maximum grip length and versatile positioning in assembly applications
• External hex head design enables easy installation with standard tools and high torque application capability

Professional Applications & Engineering Value

These 8-32 UNC hex head screws with external-tooth lock washers are engineered to solve critical vibration-induced loosening problems in industrial machinery, automotive assemblies, and electrical enclosures. The zinc-plated steel construction provides essential corrosion resistance for harsh environments, while the coarse thread design ensures rapid installation and reduced cross-threading risks. The combination of 60,000 psi tensile strength and Rockwell B70 hardness delivers exceptional load-bearing capacity and wear resistance, making these fasteners ideal for applications requiring repeated disassembly and reassembly. The integrated locking mechanism maintains joint integrity without requiring additional components, streamlining assembly processes while ensuring long-term reliability.

Specification Summary & Compliance

This 8-32 UNC threaded fastener features precise Class 2A thread fit tolerances and fully threaded design with right-hand thread direction. Manufactured from zinc-plated steel with an external hex head (5/16" width, 7/64" height) and integrated external-tooth lock washer (0.317" OD, 0.023" thickness). The 3/8" length screw meets industry standards with 60,000 psi tensile strength and Rockwell B70 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications.