S-92949A585 5/16"-18 x 1 1/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• High mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing performance
• Precise thread engagement featuring Class 3A UNC coarse threads for secure, vibration-resistant fastening
• Efficient installation with hex drive design providing positive torque transmission and reduced tool slippage
• Full regulatory compliance meeting ASME B18.3 standards, RoHS 3, and REACH for global industrial applications
• Versatile thread coverage with fully threaded design ensuring consistent clamping force along entire length
• Optimized head profile with rounded button style distributing stress evenly while maintaining low-profile appearance

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw delivers exceptional engineering value across industrial applications where corrosion resistance and structural integrity are paramount. The combination of 70,000 psi tensile strength and Class 3A UNC coarse threads ensures reliable performance in high-vibration environments, from heavy machinery assembly to structural frameworks. The passivated finish significantly enhances the natural corrosion resistance of stainless steel, making these hex drive screws ideal for chemical processing equipment, marine applications, and food processing machinery where moisture and corrosive agents are present. The fully threaded design provides maximum thread engagement while the rounded head profile minimizes stress concentration points, delivering superior fatigue resistance in dynamic loading conditions.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit and UNC coarse threading (5/16"-18) ensuring consistent performance across applications. Complies with ASME B18.3 specifications for dimensional accuracy and mechanical properties. Meets critical regulatory requirements including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance for environmental and safety standards. The 1-1/4" length and 0.547" head diameter provide standardized dimensions for interchangeability across industrial systems.