S-90288A104 4-40 x 3/16" Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Superior load-bearing capability thanks to 80,000 psi tensile strength and Rockwell B96 hardness for reliable performance under stress
• Optimized thread engagement with fully threaded UNC coarse threads ensuring maximum holding power and vibration resistance
• Precise installation and removal facilitated by Class 2A thread fit and right-hand threading for consistent assembly operations
• Enhanced durability in demanding applications due to rounded head design that reduces stress concentration and prevents snagging
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe use in regulated industries
• Versatile 3/16" length providing flexibility for various assembly requirements without compromising strength

Professional Applications & Engineering Value

These 4-40 UNC rounded head screws deliver critical engineering advantages in industrial settings where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel material, enhanced by passivated finish, effectively combats oxidation and chemical exposure in manufacturing equipment, electronic enclosures, and marine applications. The fully threaded coarse UNC design ensures rapid installation and superior vibration resistance, addressing common loosening issues in dynamic environments. With 80,000 psi tensile strength, these stainless steel fasteners maintain structural integrity under heavy loads, while the rounded head profile minimizes protrusion risks in confined spaces. This combination makes them ideal for precision assemblies requiring consistent thread fit and long-term performance.

Specification Summary & Compliance

This 4-40 UNC screw features precise Class 2A thread fit per standard inch measurements, with coarse threads and right-hand threading for universal compatibility. Manufacturing adheres to strict dimensional tolerances for head diameter (0.211") and length (3/16"). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial applications worldwide.