S-98164A309 3/8"-16 x 1 3/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable heavy-duty applications
• Precision thread engagement with Class 3A thread fit ensuring secure, vibration-resistant connections in critical assemblies
• Enhanced surface durability through passivated finish that increases corrosion resistance and extends service life
• Optimized installation efficiency featuring hex drive (7/32") and rounded button head design for easy access in confined spaces
• Full-threaded coarse UNC threading providing faster installation and superior holding power in various materials
• Regulatory compliance assurance meeting ASME B18.3 standards and RoHS/REACH environmental directives

Professional Applications & Engineering Value

This 316 stainless steel rounded head screw delivers critical performance advantages in demanding industrial environments where corrosion resistance and mechanical reliability are paramount. The combination of Class 3A thread fit and fully threaded UNC coarse threading ensures precise engagement and superior vibration resistance in machinery, structural assemblies, and chemical processing equipment. The passivated finish significantly enhances the inherent corrosion resistance of 316 stainless steel, making these hex drive screws ideal for marine applications, food processing facilities, and outdoor installations exposed to harsh weather conditions. The rounded button head profile with 7/32" hex drive facilitates quick installation while providing a finished appearance that reduces snagging hazards in automated systems.

Specification Summary & Compliance

This high-performance fastener features precision 3/8"-16 UNC coarse threading with Class 3A thread fit for exacting dimensional accuracy. Manufactured to ASME B18.3 specifications, the screw delivers consistent performance across industrial applications. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global markets and environmentally conscious manufacturing operations. The combination of 70,000 psi tensile strength and Rockwell B55 hardness provides reliable mechanical performance while maintaining corrosion resistance through the passivated surface treatment.