S-90287A838 4-40 x 3/8" Tamper-Resistant One-Way-Drive Steel Round Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 60,000 PSI for reliable performance in demanding applications
• Superior corrosion resistance with zinc-plated steel construction, extending service life
• Easy installation and removal with standard rounded head and one-way drive style
• Precise Class 2A thread fit ensures smooth assembly and consistent fastening
• Full threading along the 3/8" length provides maximum grip and holding power
• Coarse UNC thread spacing enables quick engagement and reduced cross-threading risk
• Compliance with RoHS 3 and REACH regulations for safe use in regulated industries

Professional Applications & Engineering Value

These 4-40 UNC zinc-plated steel rounded head screws deliver critical engineering value in industrial settings where vibration resistance and long-term reliability are paramount. The coarse thread spacing combined with Class 2A fit ensures rapid assembly in production environments while minimizing the risk of thread damage. The zinc-plated steel construction provides essential corrosion protection for equipment exposed to harsh conditions, while the fully threaded design maximizes surface contact for superior load distribution. These 60,000 PSI tensile strength fasteners are engineered to maintain clamping force in machinery, electronics, and automotive applications where failure is not an option.

Specification Summary & Compliance

These rounded head screws feature precise UNC coarse threads with Class 2A fit tolerance, ensuring consistent performance across assemblies. The 4-40 thread size and 3/8" length provide standardized dimensions for interchangeable use. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and restricted substance compliance for global industrial applications.