S-91870A638 1/4"-20 x 2" 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 environments
• Superior corrosion resistance 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 heavy-duty applications
• Precise thread engagement with Class 3A thread fit ensures reliable fastening in critical assemblies
• Optimized flush mounting through standard flat head profile and 82° countersink angle for smooth surface finishing
• Full-threaded design provides consistent holding power along the entire 2" length for maximum grip
• Regulatory compliance meets ASME B18.3 specifications and environmental standards for global industrial use

Professional Applications & Engineering Value

These 1/4-20 UNC flat head screws with tamper-resistant T30 Torx drive address critical security and performance requirements in industrial settings. The 18-8 stainless steel material combined with passivated finish creates a robust barrier against corrosion, making them ideal for harsh environments where chemical exposure or moisture is present. The Class 3A thread fit and coarse thread spacing ensure rapid installation with minimal cross-threading risk, while the fully threaded design maintains consistent clamping force across the entire fastener length. These security screws are particularly valuable in public infrastructure, electrical enclosures, and machinery where vandalism prevention and long-term reliability are paramount. The standard flat head profile with 82° countersink allows for flush mounting in precision applications, eliminating protrusions that could interfere with moving components or create safety hazards.

Specification Summary & Compliance

Manufactured to exacting dimensional standards with Class 3A thread fit precision and UNC coarse thread specification. These flat head screws comply with ASME B18.3 mechanical specifications and maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The right-hand thread direction and standard flat head profile ensure compatibility with conventional installation tools and procedures across industrial applications.