S-91870A754 1/4"-20 x 1 1/4" ASME B18.3 Tamper-Resistant Torx Plus Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with Torx Plus IPR30 drive, preventing unauthorized access in security-sensitive installations
• Superior corrosion protection from 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments
• Precise flush mounting with standard 82° countersink angle and flat head design for seamless industrial aesthetics
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding load-bearing applications
• Reliable thread engagement through Class 3A thread fit and full UNC coarse threading, reducing cross-threading risks
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
• Optimized installation efficiency with right-hand coarse threading providing faster assembly in production environments

Professional Applications & Engineering Value

Engineered for high-security applications where unauthorized tampering poses operational risks, this 18-8 stainless steel flat head screw delivers critical protection through its tamper-resistant Torx Plus drive system. The combination of passivated finish and stainless steel material provides exceptional corrosion resistance for outdoor equipment, marine hardware, and chemical processing facilities where environmental exposure compromises fastener integrity. The Class 3A thread fit and UNC coarse threading ensure vibration-resistant connections in machinery, electrical enclosures, and transportation equipment, while the 82° countersink angle enables flush mounting for safety-critical applications requiring smooth surfaces. These engineering features address common industrial challenges including maintenance reduction, security enhancement, and corrosion-induced failure prevention.

Specification Summary & Compliance

This fastener maintains precision Class 3A thread fit with 1/4"-20 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance standards. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring restricted substance adherence for global industrial applications.