S-91900A614 5/16"-18 x 1 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized Torx T40 drive that deters unauthorized access in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Precision threading performance with Class 3A UNC coarse threads ensuring reliable engagement and vibration resistance
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH
• Optimized head geometry featuring rounded button profile for reduced snagging and improved aesthetic integration

Professional Applications & Engineering Value

These tamper-resistant Torx screws address critical security and durability challenges in industrial settings where unauthorized access or component tampering presents significant risks. The combination of 18-8 stainless steel material and passivated finish creates a robust barrier against corrosive elements, making these security fasteners ideal for outdoor equipment, electrical enclosures, and public infrastructure applications. The fully threaded design with UNC coarse threading ensures rapid installation and maximum holding power in demanding environments. Engineering teams specify these industrial fasteners for permanent installations where maintenance access must be controlled, while the T40 drive system provides sufficient torque transmission without compromising the tamper-resistant features that protect critical assets.

Specification Summary & Compliance

This 5/16"-18 x 1-1/2" security screw maintains precision Class 3A thread fit tolerances with UNC coarse threading (18 TPI) for optimal engagement in various materials. Manufacturing and dimensional compliance strictly adheres to ASME B18.3 standards, ensuring interchangeability and reliability across industrial applications. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) restrictions on hazardous substances and REACH (EC 1907/2006) regulations regarding chemical safety, making it suitable for global distribution and use in regulated industries requiring environmental responsibility.