S-95635A451 1/4"-28 x 3/4" ASME B18.3 Tamper-Resistant Hex-Drive Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized hex drive requiring matching tools, preventing unauthorized access in secure installations
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Precise thread engagement with Class 3A UNF fine threading ensuring reliable fastening in vibration-prone environments
• Optimized mechanical performance delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Streamlined installation with rounded button head profile providing smooth surface transition and reduced snagging
• Full regulatory compliance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
• Complete thread coverage along the 3/4" length enabling maximum grip strength in various material thicknesses

Professional Applications & Engineering Value

This tamper-resistant rounded head screw addresses critical security and durability challenges in industrial settings where unauthorized access or component tampering presents operational risks. The combination of 18-8 stainless steel material and passivated finish creates a robust barrier against corrosive elements, making it ideal for outdoor equipment, marine applications, and chemical processing environments. The UNF fine threading (1/4"-28) with Class 3A fit ensures precise engagement in tapped holes, reducing the likelihood of cross-threading while maintaining clamping force under vibration. Engineered with a tamper-resistant hex drive (5/32"), this security fastener prevents casual disassembly in public infrastructure, electrical enclosures, and machinery guards where safety and controlled access are paramount.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 standards with Class 3A thread tolerance for superior fit and performance. The UNF fine thread specification (1/4"-28) ensures precise engagement in demanding applications. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations guarantees safe usage across various industries. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance in high-stress environments.