S-90484A143 8-32 x 3/4" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior tamper-resistant security with specialized hex drive design to prevent unauthorized access in public or high-risk environments
• Exceptional durability and corrosion resistance thanks to black-oxide coated alloy steel construction that withstands harsh industrial conditions
• Maximum load-bearing capacity with 130,000 psi tensile strength and Rockwell C39 hardness for reliable performance under heavy stress
• Precise thread engagement with Class 3A fit and coarse UNC threading for faster installation and superior vibration resistance
• Full-threaded design ensures consistent holding power along the entire 3/4" length for secure fastening in various material thicknesses
• Rounded button head profile provides a smooth, low-profile finish that reduces snagging while maintaining aesthetic appeal
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

These 8-32 UNC thread screws with tamper-resistant hex drive address critical security and reliability challenges in industrial settings. The black-oxide alloy steel construction provides excellent corrosion resistance for outdoor equipment, electrical enclosures, and machinery exposed to moisture or chemicals. The Class 3A thread fit ensures precise engagement in tapped holes, reducing the risk of cross-threading during assembly while maintaining consistent clamping force. The fully threaded design offers versatile fastening solutions for varying material thicknesses in security panels, access controls, and public infrastructure. With 130,000 psi tensile strength, these screws maintain structural integrity in high-vibration applications such as transportation equipment and industrial machinery, where loosening could compromise safety and operation.

Specification Summary & Compliance

This rounded head screw features precise 8-32 UNC coarse threads with Class 3A fit for superior thread engagement and meets ASME B18.3 manufacturing specifications. The product maintains dimensional accuracy with 0.312" head diameter and 3/4" length, ensuring consistent performance across applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms environmental safety and restricted substance adherence for global industrial use.