S-92949A445 5/16"-18 x 6" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• Superior load-bearing capability with 70,000 psi tensile strength to withstand heavy-duty mechanical stresses
• Precise thread engagement thanks to Class 3A thread fit and UNC coarse spacing for reliable fastening in industrial assemblies
• Easy installation and removal with 3/16" hex drive design that prevents cam-out and allows high torque application
• Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
• Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
• Versatile rounded head profile offering a low-profile, finished appearance while maintaining structural integrity

Professional Applications & Engineering Value

These 18-8 stainless steel rounded head screws deliver critical engineering solutions for demanding industrial applications where corrosion resistance and structural reliability are paramount. The combination of UNC coarse threading and Class 3A thread fit ensures rapid installation and vibration resistance in machinery, heavy equipment, and structural assemblies. The passivated finish enhances the natural corrosion resistance of stainless steel, making these hex drive screws ideal for outdoor applications, chemical processing environments, and marine equipment. With full threading along the entire 6-inch length, these fasteners provide consistent clamping force in thick materials and complex assemblies, while the rounded head design offers a clean, finished appearance without sharp edges that could pose safety hazards.

Specification Summary & Compliance

This fastener features precision 5/16"-18 UNC coarse thread with Class 3A fit for superior thread engagement and meets ASME B18.3 specifications (ASTM F879) for dimensional accuracy and performance. The manufacturing process ensures compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming the absence of restricted hazardous substances. The passivated surface treatment provides enhanced corrosion protection while maintaining the mechanical properties of the 18-8 stainless steel base material.