S-90484A547 1/4"-20 x 1 1/2" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior tamper-resistance with specialized hex drive design to prevent unauthorized removal in high-security applications
• Exceptional strength and durability with 130,000 psi tensile strength and Rockwell C39 hardness for demanding industrial environments
• Enhanced corrosion protection through black-oxide coating on alloy steel for extended service life
• Reliable thread engagement with Class 3A fit and UNC coarse spacing ensuring secure fastening in various materials
• Streamlined installation with rounded button head profile that reduces surface snagging and provides a finished appearance
• Full-threaded design offering maximum grip length and consistent holding power along the entire fastener
• Industry-standard compliance meeting rigorous ASME B18.3 and ASTM F835 specifications for guaranteed performance

Professional Applications & Engineering Value

This black-oxide alloy steel rounded head screw delivers critical security and reliability where tampering prevention is paramount. The tamper-resistant hex drive (5/32") specifically addresses vulnerability in public facilities, electrical enclosures, and machinery where standard fasteners pose security risks. Engineered with Class 3A UNC coarse threads, it provides superior resistance to vibration loosening while maintaining easy installation in various substrates. The combination of 130,000 psi tensile strength and Rockwell C39 hardness ensures these screws withstand extreme mechanical stresses in industrial equipment, transportation systems, and infrastructure applications. The fully threaded design maximizes surface contact for enhanced load distribution, making it ideal for securing panels, guards, and access points where both security and structural integrity are essential.

Specification Summary & Compliance

This fastener maintains precision Class 3A thread fit with UNC 1/4"-20 coarse spacing according to ASME standards. Manufacturing complies with ASME B18.3 and ASTM F835 specifications, ensuring dimensional accuracy and performance reliability. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial components.