S-91900A608 5/16"-18 x 1" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized Torx drive requiring matching T40 tools, preventing unauthorized access in secure facilities
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness to withstand high-stress applications
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening in critical assemblies
• Full-threaded design providing maximum grip length and uniform load distribution across the entire fastener
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use
• Rounded button head profile offering low-profile installation with smooth finished appearance

Professional Applications & Engineering Value

These tamper-resistant Torx screws deliver critical security solutions for industrial applications where unauthorized tampering poses significant risks. The 18-8 stainless steel composition combined with passivated finish creates exceptional resistance to corrosion and chemical exposure, making them ideal for harsh environments including outdoor installations, manufacturing equipment, and electronic enclosures. The Class 3A thread fit with UNC coarse threading ensures rapid installation and reliable performance in vibration-prone applications. Engineered with 70,000 psi tensile strength, these fully threaded fasteners maintain structural integrity under substantial loads, while the T40 drive system provides the torque transmission necessary for secure fastening without stripping. These characteristics make them particularly valuable for securing access panels, control systems, and public infrastructure where both durability and security are paramount.

Specification Summary & Compliance

This 5/16"-18 x 1" rounded head screw features precise Class 3A thread fit with UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.3 specifications for dimensional accuracy and performance standards. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) regulations regarding chemical safety, ensuring environmental responsibility and global market acceptance for industrial procurement.