S-91870A627 1/4"-20 x 1 1/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized T30 Torx drive for secure installations in high-security environments
• 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 applications
• Precision thread engagement with Class 3A UNC coarse threads ensuring reliable fastening in various materials
• Optimal flush mounting featuring standard 82° countersink angle for smooth surface finishing
• Full-threaded design providing consistent holding power along the entire 1-1/4" length
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH

Professional Applications & Engineering Value

This 18-8 stainless steel flat head screw with tamper-resistant T30 Torx drive addresses critical security and durability challenges in industrial settings. The combination of passivated finish and stainless steel material provides exceptional resistance to corrosion and chemical exposure, making it ideal for harsh environments including outdoor installations, marine applications, and chemical processing facilities. The Class 3A thread fit and UNC coarse threading ensure quick installation and reliable performance in various substrates, while the 82° countersink angle allows for flush mounting in precision assemblies. These security screws are particularly valuable in public infrastructure, transportation systems, and access panels where unauthorized tampering must be prevented without compromising structural integrity.

Specification Summary & Compliance

This 1/4"-20 x 1-1/4" flat head screw features precision Class 3A thread fit with UNC coarse threads and right-hand threading direction. Manufactured to exacting ASME B18.3 standards, the fastener maintains dimensional accuracy throughout its fully threaded length. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety. The combination of 70,000 psi tensile strength and Rockwell B70 hardness guarantees consistent performance under mechanical stress while the standardized 82° countersink angle ensures proper seating in prepared holes.