S-90288A106 4-40 x 1/4" 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 for long service life in harsh environments
• Superior holding power achieved through fully threaded design and 80,000 psi tensile strength for reliable fastening performance
• Precision thread engagement with Class 2A thread fit ensuring consistent assembly and reduced cross-threading risks
• Optimized installation efficiency through coarse UNC threading and right-hand direction for faster driving in various materials
• Enhanced durability with Rockwell B96 hardness providing excellent resistance to wear and deformation
• Secure tamper-resistant design featuring one-way drive style for permanent installations where removal prevention is critical
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe use in regulated industrial applications

Professional Applications & Engineering Value

These 4-40 UNC rounded head screws deliver exceptional engineering value in demanding industrial environments where corrosion resistance and tamper-proof security are paramount. The 18-8 stainless steel construction with passivated finish provides superior protection against chemical exposure and atmospheric corrosion, making them ideal for electrical enclosures, marine equipment, and food processing machinery. The fully threaded design ensures maximum grip length and distribution of clamping force, while the coarse thread spacing enables faster installation in soft materials and prevents stripping. The one-way drive style offers permanent fastening solutions for public infrastructure, security panels, and maintenance-free assemblies where unauthorized access prevention is critical to operational safety and asset protection.

Specification Summary & Compliance

This rounded head screw features precise Class 2A thread fit with UNC coarse thread profile and right-hand threading direction. Manufacturing complies with standard inch system specifications including 4-40 thread size, 1/4" length, and standard rounded head profile. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations for hazardous substance restrictions, ensuring environmental responsibility and regulatory adherence for industrial procurement requirements.