S-91870A731 1/4"-20 x 1 3/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with T30 Torx drive prevents unauthorized removal in high-security applications
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life
• Maximum load-bearing capacity with 70,000 PSI tensile strength and Rockwell B70 hardness for demanding environments
• Precise thread engagement with Class 3A UNC coarse threads ensuring reliable, vibration-resistant connections
• Optimized flush mounting through standard 82° countersink angle and flat head design for smooth surface finishing
• Full-thread coverage across the entire 1 3/4" length provides consistent clamping force distribution
• Regulatory compliance meeting ASME B18.3 specifications and environmental standards for global applications

Professional Applications & Engineering Value

Engineered for critical security applications where unauthorized access must be prevented, these 18-8 stainless steel flat head screws deliver exceptional performance in demanding environments. The tamper-resistant T30 Torx drive provides superior anti-vandalism protection while maintaining installation efficiency. The passivated finish significantly enhances corrosion resistance, making these security screws ideal for outdoor equipment, public infrastructure, and industrial machinery exposed to harsh conditions. With Class 3A UNC coarse threading and full-length threading, these fasteners ensure maximum engagement strength and vibration resistance in heavy-duty fastening applications. The standardized 82° countersink angle and flat head profile allow for seamless surface integration, eliminating protrusions while maintaining structural integrity under high tensile loads.

Specification Summary & Compliance

This 1/4"-20 x 1 3/4" flat head screw features precision UNC coarse threading with Class 3A fit for optimal thread engagement and tolerance control. Manufactured to ASME B18.3 specifications with complete RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental responsibility and regulatory adherence. The right-hand thread direction and fully threaded design provide consistent fastening performance across the entire length, while the standard flat head profile with 82° countersink maintains industry-standard installation requirements.