S-97654A303 5/16"-18 x 1/2" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for long-lasting performance in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing capability
• Precise thread engagement with Class 3A UNC coarse threads ensuring secure fastening and vibration resistance
• Enhanced installation efficiency through 3/16" hex drive design providing positive torque transmission and reduced tool slippage
• Increased bearing surface with integrated flange and wide rounded button head distributing clamp load effectively
• Full threading versatility allowing complete engagement along the 1/2" length for adjustable positioning
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for environmentally responsible manufacturing

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw delivers critical performance advantages for industrial assembly applications where corrosion resistance and structural integrity are paramount. The passivated finish significantly enhances surface durability against chemical exposure and oxidation, while the UNC coarse threading with Class 3A fit provides rapid installation and superior vibration resistance in machinery, equipment frames, and structural components. The combination of flanged design and wide rounded button head creates an expanded bearing surface that prevents surface damage and maintains joint integrity under dynamic loads. With its hex drive configuration and fully threaded shank, this fastener offers reliable torque transmission and flexible positioning capabilities across automotive, marine, and industrial manufacturing applications where precision fastening solutions are essential.

Specification Summary & Compliance

This precision-engineered rounded head screw features 5/16"-18 UNC coarse threading with Class 3A thread fit for superior dimensional accuracy and engagement. Manufacturing specifications include a 1/2" length, 0.688" flange diameter, and fully threaded construction. The component is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring adherence to international standards for hazardous substance restrictions and chemical safety in industrial applications.