S-95635A535 1/4"-20 x 1/4" ASME B18.3 Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Maximum tamper resistance with specialized hex drive design that deters unauthorized removal in high-security applications
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness to withstand heavy loads and vibration
• Precise thread engagement with Class 3A fit and UNC coarse threading for reliable fastening in demanding industrial environments
• Complete thread coverage with full threading along the entire 1/4" length for maximum grip and holding power
• Optimized drive performance with 5/32" tamper-resistant hex drive for secure tool engagement while preventing vandalism
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations for quality and safety

Professional Applications & Engineering Value

These tamper-resistant hex screws provide critical security solutions for industrial equipment, public infrastructure, and commercial applications where unauthorized access poses significant risks. The 18-8 stainless steel composition combined with passivated finish delivers exceptional resistance to corrosion, moisture, and chemical exposure, making them ideal for harsh environments including outdoor installations, marine applications, and manufacturing facilities. The rounded head design with tamper-resistant drive prevents standard tools from engaging, while the Class 3A thread fit ensures precise mating with nuts and threaded holes. The UNC coarse threading facilitates quick installation and provides superior resistance to vibration loosening, while the fully threaded design maximizes contact surface for enhanced load distribution. These security screws are engineered to maintain integrity under continuous stress with their 70,000 psi tensile strength, making them suitable for structural applications, machinery guards, access panels, and permanent installations requiring reliable, long-term fastening solutions.

Specification Summary & Compliance

This security fastener features precision 1/4"-20 UNC threads with Class 3A thread fit for superior dimensional accuracy and reliable engagement. Manufactured in compliance with ASME B18.3 standards for dimensional consistency and performance reliability. The product meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements, ensuring safe use across various industrial sectors. The combination of coarse thread spacing and right-hand thread direction follows industry standards for compatibility with existing fastener systems and tooling.