S-91900A605 5/16"-18 x 3/4" 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 specific T40 tools, preventing unauthorized access in secure environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated surface treatment for extended service life
• High-load bearing capability with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Precise thread engagement with Class 3A thread fit ensuring reliable fastening and vibration resistance
• Full-threaded design providing maximum grip length and uniform stress distribution along the entire fastener
• Rounded button head profile offering a low-profile, finished appearance while minimizing snagging hazards
• Regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use

Professional Applications & Engineering Value

These 18-8 stainless steel tamper-resistant Torx screws address critical security and durability challenges in industrial settings. The combination of passivated finish and stainless steel material provides exceptional corrosion resistance, making them ideal for harsh environments where moisture or chemicals are present. The T40 drive system and specialized rounded head design prevent unauthorized removal while maintaining a clean aesthetic. With UNC coarse threading and Class 3A thread fit, these fasteners deliver reliable performance in vibration-prone applications such as machinery, electrical enclosures, and public infrastructure. The fully threaded construction ensures maximum holding power across the entire 3/4" length, providing engineers with a secure fastening solution that maintains integrity under 70,000 psi tensile loads.

Specification Summary & Compliance

This 5/16"-18 x 3/4" rounded head screw features precision UNC coarse threads with Class 3A thread fit for superior engagement and dimensional accuracy. Manufacturing complies with ASME B18.3 specifications for consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and safety standards are maintained for industrial distribution and use.