S-95635A452 1/4"-28 x 1" 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 design to prevent unauthorized access in sensitive applications
• 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 threads ensuring reliable fastening in critical assemblies
• Maximum load-bearing capacity delivering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Complete thread coverage along the 1" length providing consistent clamping force and vibration resistance
• Industry compliance assurance meeting ASME B18.3 specifications for dimensional accuracy and performance reliability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

These 1/4-28 UNF Class 3A rounded head screws address critical security and durability challenges in industrial environments. The 18-8 stainless steel material combined with passivated finish provides exceptional resistance to corrosion, moisture, and chemical exposure, making them ideal for outdoor equipment, marine applications, and harsh manufacturing settings. The tamper-resistant hex drive design with 5/32" drive size prevents unauthorized tampering in public infrastructure, electrical enclosures, and security systems. The fine thread spacing and Class 3A thread fit ensure precise engagement in thin materials and high-vibration applications, while the fully threaded design maximizes pull-out strength. These security screws deliver reliable performance in assembly lines, machinery maintenance, and critical infrastructure where both tensile strength and tamper resistance are paramount.

Specification Summary & Compliance

This rounded head screw features precision 1/4"-28 UNF Class 3A threads with fine thread spacing and right-hand thread direction, manufactured to exacting dimensional standards. The fastener maintains Rockwell B70 hardness and 70,000 psi tensile strength throughout its 1" fully threaded length. Compliance includes ASME B18.3 specifications for dimensional accuracy, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.